Academic literature on the topic 'Casimir interactions'
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Journal articles on the topic "Casimir interactions"
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Podgornik, R., and J. Dobnikar. "Casimir and pseudo-Casimir interactions in confined polyelectrolytes." Journal of Chemical Physics 115, no. 4 (July 22, 2001): 1951–59. http://dx.doi.org/10.1063/1.1383052.
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Milton, Kimball A., Yang Li, Pushpa Kalauni, Prachi Parashar, Romain Guérout, Gert-Ludwig Ingold, Astrid Lambrecht, and Serge Reynaud. "Negative entropies in Casimir and Casimir-Polder interactions." Fortschritte der Physik 65, no. 6-8 (December 5, 2016): 1600047. http://dx.doi.org/10.1002/prop.201600047.
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Spruch, L. "Long-Range (Casimir) Interactions." Science 272, no. 5267 (June 7, 1996): 1452–55. http://dx.doi.org/10.1126/science.272.5267.1452.
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MOSTEPANENKO, V. M., V. B. BEZERRA, G. L. KLIMCHITSKAYA, and C. ROMERO. "NEW CONSTRAINTS ON YUKAWA-TYPE INTERACTIONS FROM THE CASIMIR EFFECT." International Journal of Modern Physics A 27, no. 15 (June 14, 2012): 1260015. http://dx.doi.org/10.1142/s0217751x12600159.
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Measurements of the Casimir force are used to obtain stronger constraints on the parameters of hypothetical interactions predicted in different unification schemes beyond the Standard Model. We review new strong constraints on the Yukawa-type interactions derived during the last two years from recent experiments on measuring the lateral Casimir force, Casimir force in configurations with corrugated boundaries and the Casimir–Polder force. Specifically, from measurements of the lateral Casimir force compared with the exact theory the strengthening of constraints up to a factor of 24 millions was achieved. We also discuss further possibilities to strengthen constraints on the Yukawa interactions from the Casimir effect.
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MOSTEPANENKO, V. M., V. B. BEZERRA, G. L. KLIMCHITSKAYA, and C. ROMERO. "NEW CONSTRAINTS ON YUKAWA-TYPE INTERACTIONS FROM THE CASIMIR EFFECT." International Journal of Modern Physics: Conference Series 14 (January 2012): 200–214. http://dx.doi.org/10.1142/s2010194512007337.
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Measurements of the Casimir force are used to obtain stronger constraints on the parameters of hypothetical interactions predicted in different unification schemes beyond the Standard Model. We review new strong constraints on the Yukawa-type interactions derived during the last two years from recent experiments on measuring the lateral Casimir force, Casimir force in configurations with corrugated boundaries and the Casimir-Polder force. Specifically, from measurements of the lateral Casimir force compared with the exact theory the strengthening of constraints up to a factor of 24 millions was achieved. We also discuss further possibilities to strengthen constraints on the Yukawa interactions from the Casimir effect.
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Milonni, Peter W., Larry Spruch, and Daniel Kleppner. "Vacuums, Retardation and Casimir Interactions." Physics Today 44, no. 6 (June 1991): 13–15. http://dx.doi.org/10.1063/1.2810131.
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Sernelius, B. E. "Casimir interactions in graphene systems." EPL (Europhysics Letters) 95, no. 5 (August 12, 2011): 57003. http://dx.doi.org/10.1209/0295-5075/95/57003.
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Panella, Orlando, and Allan Widom. "Casimir effects in gravitational interactions." Physical Review D 49, no. 2 (January 15, 1994): 917–22. http://dx.doi.org/10.1103/physrevd.49.917.
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KLIMCHITSKAYA, G. L., and U. MOHIDEEN. "CONSTRAINTS ON YUKAWA-TYPE HYPOTHETICAL INTERACTIONS FROM RECENT CASIMIR FORCE MEASUREMENTS." International Journal of Modern Physics A 17, no. 29 (November 20, 2002): 4143–52. http://dx.doi.org/10.1142/s0217751x02013162.
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Constraints on the Yukawa-type long-range interactions following from the Casimir effect are considered. The constraints obtained from the recent Casimir force measurements by means of a torsion pendulum and an atomic force microscope are collected and compared. New constraints are obtained from the measurement of the lateral Casimir force. The conclusion is made that the Casimir effect has an advantage over the conventional methods in obtaining stronger constraints on hypothetical interactions.
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TEO, L. P. "FINITE TEMPERATURE FERMIONIC CASIMIR INTERACTION IN ANTI-DE SITTER SPACE–TIME." International Journal of Modern Physics A 28, no. 31 (December 19, 2013): 1350158. http://dx.doi.org/10.1142/s0217751x13501583.
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We study the finite temperature Casimir interactions on two parallel boundaries in the anti-de Sitter space–time AdS D+1 induced by the vacuum fluctuations of a massive fermionic field with MIT bag boundary conditions. Due to the nontrivial curvature, the magnitudes of the Casimir pressures on the two boundaries are different, where the pressure on the right is larger than the pressure on the left. Nevertheless, it is shown that the Casimir interaction always tends to attract the two boundaries to each other at any temperature and for any mass. The ratio of the magnitude of the pressure on the right to the magnitude of the pressure on the left decreases as the temperature increases or when the mass increases. For bosonic fields, it is well known that the high temperature leading term of the Casimir interaction is linear in temperature. However, for fermionic fields, the Casimir interaction decays exponentially at high temperature due to the absence of zero Matsubara frequency.
Dissertations / Theses on the topic "Casimir interactions"
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Noto, Antonio. "Non-equilibrium Casimir interactions : from dynamical to thermal effects." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT279/document.
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Dans cette thèse, après une introduction où nous présentons brièvement la physique des forces de Casimir, nous montrons nos résultats obtenus pendant le doctorat. D'abord, nous montrons notre travail sur les interactions de van der Waals / Casimir-Polder lorsque le système est dans une configuration hors équilibre à cause du mouvement uniformément accéléré des atomes. Nous étudions le système de deux atomes uniformément accélérés dans le vide quantique quand ils sont dans leur état fondamental ou dans un état corrélé (un atome excité et un atome dans son état fondamental). Nous analysons ce système avec un modèle heuristique semi-classique et une méthode plus rigoureuse qui nous avons étendu à partir d'une procédure générale développée dans la littérature. Nous trouvons un changement de la dépendance de l'interaction de la distance en raison de l'accélération. Nous montrons que les forces de Casimir-Polder entre deux atomes uniformément accélérés en mouvement relativiste, qui interagissent avec le champ scalaire, présentent une transition à partir d'un comportement thermique à courtes distances, comme prédit par l'effet Unruh, à un comportement non thermique à longues distances, associé à la rupture de la description inertielle et locale du système. En plus, lorsque le cas d'atomes qui interagissent avec le champ électromagnétique quantique est considéré, on constate que de nouvelles caractéristiques apparaissent dans l'interaction.Ensuite, nous présentons notre travail sur un nouveau couplage opto-mécanique d'un miroir oscillant de façon efficace avec un gaz d'atomes de Rydberg, médié par la force atome-miroir dynamique de Casimir-Polder. Nous constatons que ce couplage peut produire une excitation de résonance atomique de champ proche, qui n'est pas liée à l'excitation des atomes par les quelques photons réels attendus de l'effet Casimir dynamique. Dans des conditions expérimentales accessibles, cette probabilité d'excitation est importante (environ 20 %) et rend possible l'observation de ce nouvel effet Casimir-Polder dynamique. Donc nous proposons une configuration expérimentale réaliste pour réaliser ce système fait d'un gaz d'atomes froids piégés mis en face d'un substrat semi-conducteur, dont les propriétés diélectriques sont modulées dans le temps.Enfin, nous nous concentrons sur nos résultats obtenus pour le calcul de la pression Casimir-Lifshitz entre deux réseaux lamellaires diélectriques différents. Ce système est supposé dans une configuration hors équilibre thermique. En fait, les deux réseaux présentent deux températures différentes et ils sont immergés dans un bain thermique ayant une troisième température. Le calcul de la pression est basé sur une méthode qui exploite les opérateurs de diffusion des réseaux, déduits en utilisant la méthode modale de Fourier. Nous présentons nos résultats numériques caractérisant en détail le comportement de la pression, en faisant varier les trois températures et en modifiant les paramètres géométriques des réseaux. Cette variation des paramètres du système permet de régler la force de répulsive à attractive ou de réduire fortement la pression pour des intervalles de températures. En outre, on montre que la combinaison des effets de non-équilibre et géométriques rend ce système particulièrement intéressant pour l'observation de la force de Casimir répulsiveIn this thesis, after an introduction where we briefly present the general context of Casimir physics, we present the results obtained during the PhD. At first, we show our work about the van der Waals/Casimir-Polder interactions between two atoms in an out-of-equilibrium condition due to their uniformly accelerated motion. We study the system of two uniformly accelerated atoms in vacuum space, when they are in their ground-state and when they are in a correlated state (one excited and one ground-state atom). We analyze this system both with an heuristic semiclassical model and with a more rigorous method, based on a separation of radiation reaction and vacuum fluctuations contributions, that we extend starting from a general procedure known in literature. We find a change of the distance-dependence of the interaction due to the acceleration. We show that Casimir-Polder forces between two relativistic uniformly accelerated atoms, interacting with the scalar field, exhibit a transition from the short-distance thermal-like behavior predicted by the Unruh effect to a long-distance nonthermal behavior, associated with the breakdown of a local inertial description of the system. In addition, we obtain new features of the resonance interaction in the case of atoms interacting with the quantum electromagnetic field.Next, we present our work about a new optomechanical coupling of an effectively oscillating mirror with a Rydberg atoms gas, mediated by the dynamical atom-mirror Casimir-Polder force. We find that this coupling may produce a near-field resonant atomic excitation not related to the excitation of atoms by the few real photons expected by dynamical Casimir effect. In accessible experimental conditions, this excitation probability is significant (about 20%) making the observation of this new dynamical Casimir-Polder effect possible. For this reason, we propose a realistic experimental configuration to realize this system made of a cold atom gas trapped in front of a semiconductor substrate, whose dielectric properties are periodically modulated in time.Finally, we focus on our results obtained for the Casimir-Lifshitz pressure between two different dielectric lamellar gratings. This system is assumed to be in an out-of-thermal-equilibrium configuration, i.e. the two gratings have two different temperatures and they are immersed in a thermal bath having a third temperature. The computation of the pressure is based on a method exploiting the scattering operators of the bodies, deduced using the Fourier modal method. In our numerical results we characterize in detail the behavior of the pressure, both by varying the three temperatures and by changing the geometrical parameters of the gratings. In this way we show that it is possible to tune the force from attractive to repulsive or to strongly reduce the pressure for large ranges of temperatures. Moreover, we stress that the interplay between nonequilibrium effects and geometrical periodicity make this system particularly interesting for the observation of the repulsive Casimir force
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Phan, Anh Duc. "Graphene Casimir Interactions and Some Possible Applications." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4386.
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Scientific development requires profound understandings of micromechanical and nanomechanical systems (MEMS/NEMS) due to their applications not only in the technological world, but also for scientific understanding. At the micro- or nano-scale, when two objects are brought close together, the existence of stiction or adhesion is inevitable and plays an important role in the behavior operation of these systems. Such effects are due to surface dispersion forces, such as the van der Waals or Casimir interactions. The scientific understanding of these forces is particularly important for low-dimensional materials. In addition, the discovery of materials, such as graphitic systems has provided opportunities for new classes of devices and challenging fundermental problems. Therefore, invesigations of the van der Waals or Caismir forces in graphene-based systems, in particular, and the solution generating non-touching systems are needed.
In this study, the Casimir force involving 2D graphene is investigated under various conditions. The Casimir interaction is usually studied in the framework of the Lifshitz theory. According to this theory, it is essential to know the frequency-dependent reflection coefficients of materials. Here, it is found that the graphene reflection coefficients strongly depend on the optical conductivity of graphene, which is described by the Kubo formalism. When objects are placed in vacuum, the Casimir force is
attractive and leads to adhesion on the surface. We find that the Casimir repulsion can be obtained by replacing vacuum with a suitable liquid. Our studies show that bromobenzene is the liquid providing this effect. We also find that this long-range force is temperature dependent and graphene/bromobenzene/metal substrate configuration can be used to demonstrate merely thermal Casimir interaction at room temperature and micrometer distances. These findings would provide good guidance and predictions for practical studies.
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Sin, Ronia Kévin. "Casimir and dynamical interactions in membranes and model systems." Paris 7, 2014. http://www.theses.fr/2014PA077254.
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Lipid membranes are really complex media that undergo thermal activated fluctu-ations that give rise to Casimir-like interactions between objects embedded in it. In this thesis we focus on theses Casimir like interactions and on the interactions between objects embedded in elastic media. In the first part , the Casimir-like interaction between two parallel rods of length L adsorbed on a fluid membrane is calculated analytically at short separations d< L. The rods are modeled as constraints imposed on the membrane curvature along a straight line. This allows us to define four types of rods, according to whether the membrane can twist along the rod and/or curve across it. For stiff constraints, all the interaction energies between the different types of rods are attractive and proportional to L/d. Two of the four types of rods are then equivalent, which yields six universal Casimir amplitudes. Repulsion can occur between different rods for soft constraints. Numerical results obtained for all ranges of d/L show that the attraction potential reaches kBT for d/L 0. 2. At separations smaller Than dc≃L(L//p)1/3, where lp is the rod persistence length, two rods with fixed ends will bend toward each other and finally corne into contact because of the Casimir interaction. In a second time we adress the problem of calculating Casimir interactions be¬tween arbitrary bodies by discretizing their boundaries into pointlike constraints viewed as pointlike inclusions. We study how universality emerge from this dis-cretization. Introducing an ad hoc cutoff and a regularization for the field's corre-lation function, we find that universality arises when i) the separation S between the pointlike inclusions is less than the cutoff A-1, and ii) the bodies are much larger than the cutoff. A sharp transition from discrete to continuous boundaries occurs at S = ir/A in the "thermodynamic limit" for rods at large separation. We illustrate our findings in two dimensions with rodlike bodies and more complex bodies shaped as moons. Finally in a one-dimensional elastic medium with finite correlation length and purely relaxational dynamics, we calculate the time dependence of the elastic force F(t) exchanged between two active inclusions that trigger an elastic deformation at t = 0. We consider (i) linear inclusions coupled to the field with a finite force, and (ii) non-linear inclusions imposing a finite deformation. In the non-linear case, the force exhibits a transient maximum much larger than the equilibrium force, diverging as rs-, L2 at separation L shorter than the field's correlation length. Both the mean-field and the Casimir component of the interaction are calculated. We also discuss the typical appearance time and equilibration time of the force, comparing the linear and the non-linear cases. The existence of a high transient force in the non-linear case should be a generic feature of elastically mediated interactionsLes membranes lipidiques sont des milieux complexes qui sont soumis à des fluc-tuations thermiques donnant naissance à des interactions du type Casimir quand des objets y sont inclus. Dans cette thèse, nous nous intéressons aux interactions du type Casimir et aux interactions élastiques qui apparaissent entre objets inclus dans un milieu élastique. Dans la première partie, nous nous intéressons à deux bâtons parallèles de longueur L adsorbés sur une membrane fluide et calculons analytiquement l'interaction du type Casimir pour de faibles distances d< L. Les deux bâtons sont modélisés comme des contraintes, le long d'une ligne droite, imposées à la membrane et en particulier à sa courbure. Ceci nous permet de définir quatre type de bâton, selon que la membrane peut se tordre ou non le long ou/et perpendiculairement aux bâtons. Pour des contraintes rigides, toutes les énergies d'interactions sont attractives et proportionnelles à L/d. Deux des quatre type de bâtons définis sont équivalents ce qui conduit à six amplitudes différentes mais universelles pour les interactions de Casimir. Des conditions de répulsions peuvent être réunies pour des bâtons différents avec des contraintes molles. Des résultats numériques obtenus pour une large gamme de ratio d/L montrent que le potentiel attractif peut atteindre kBT pour d/L≃0. 2. Enfin pour des distances plus petites que dc≃ L(L//p)1/3, où lp est la longueur de persistance, deux bâtons aux extrémités fixées se courberont jusqu'à entrer en contact du fait de l'interaction de Casimir. Dans un second temps nous considérons le problème du calcul de l'interaction de Casimir pour des objets de forme arbitraire en discrétisant les contours avec des contraintes ponctuelles vue comme des inclusions ponctuelles. Nous étudions comment l'universalité émerge de cette discrétisation. Ayant introduit un cutoff et une régularisation pour le calcul de la fonction de corrélation du champ de la membrane, nous trouvons que l'universalité apparaît si (i) la distance entre les inclusions ponctuelles est inférieure au cutoff A-1 et (ii) si les objets considérés sont bien plus grands que le cutoff. Une transition brutale du régime de condition de bord discret au régime continu intervient pour δ =π/Λ dans la limite thermodynamique pour des bâtons à grande distance. Nous illustrons ces propriétés à deux dimensions pour des objets du type bâton et des objets de forme plus complexe comme des lunes. Enfin, dans un milieu élastique unidimentionnel avec une longueur de corrélation finie, ie loin des conditions critiques, et dont la dynamique suit uniquement une dynamique de relaxation, nous calculons la dépendance temporelle de la force élastique F(t) échangée par deux inclusions actives qui imposent une déformation élastique au milieu. Cette déformation est déclenchée à l'instant t = 0 par les inclusions. Nous considérons (i) des inclusions linéaires qui couplent les champs à une force finie puis (ii) des inclusions non linéaires qui impose une déformation finie au milieu. Dans le cas non linéaire, la force présente un maximum transitoire, bien plus élevé que la force à l'équilibre, et qui diverge comme ~ L2 pour des distance L inférieures à la longueur de corrélation du champs considéré. Nous calculons à la fois l'interaction de champs moyen et l'interaction de Casimir. Nous discutons également les temps caractéristiques d'établissement et de mise à l'équilibre des forces en comparant le cas linéaire et le cas non linéaire. Il est important de noter que l'existence d'un maximum transitoire dans l'établissement de la force non linéaire semble être une caractéristique des interactions élastiques médiées
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Démery, Vincent. "Interactions induites par un environnement fluctuant." Phd thesis, Université Paul Sabatier - Toulouse III, 2012. http://tel.archives-ouvertes.fr/tel-00713393.
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L'interaction entre deux objets est, le plus souvent, transportée par leur environne- ment. Les caractéristiques de ce dernier permettent de calculer les propriétés de l'interaction ressentie entre ces objets. Cette thèse présente ce calcul dans deux situations différentes. La première partie concerne l'effet d'un environnement fluctuant sur le mouvement d'un seul objet. La force moyenne est calculée pour un objet avançant à vitesse constante et couplé linéairement puis quadratiquement à son environnement. Dans ce dernier cas le frottement ressenti est entièrement dû aux fluctuations : il s'agit d'un frottement de Casimir. Le coefficient de diffusion est calculé pour un couplage linéaire faible, généralisant au passage des résultats connus pour la diffusion dans un potentiel gelé. Ces calculs sont faits pour une classe très générale d'environnements, et peuvent être appliqués à la diffusion de protéines dans des membranes lipidiques fluctuantes. La deuxième partie traite de systèmes contenant des ions entre deux plaques chargées. Le premier système étudié est un modèle unidimensionnel de liquide ionique sur réseau pour lequel la pression et la densité de charge peuvent être calculées exactement. Le deuxième système est composé d'ions polarisables ; les effets de la polarisabilité sur la pression et la densité de charge y sont étudiés dans deux limites distinctes.
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Reid, M. T. (McMahon Thomas Homer). "Fluctuating surface currents : a new algorithm for efficient prediction of Casimir interactions among arbitrary materials in arbitrary geometries." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68983.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 161-163).
For most of its 60 year history, the Casimir effect was an obscure theoretical backwater, but technological advances over the past decade have promoted this curious manifestation of quantum and thermal fluctuations to a position of central importance in modern experimental physics. Dramatic progress in the measurement of Casimir forces since 1997 has created a demand for theoretical tools that can predict Casimir interactions in realistic experimental geometries and in materials with realistic frequency-dependent electrical properties. This work presents a new paradigm for efficient numerical computation of Casimir interactions. Our new technique, which we term the fluctuating-surface-current (FSC) approach to computational Casimir physics, borrows ideas from the boundary-element method of computational electromagnetism to express Casimir energies, forces, and torques between bodies of arbitrary shapes and materials in terms of interactions among effective electric and magnetic surface currents flowing on the surfaces of the objects. We demonstrate that the master equations of the FSC approach arise as logical consequences of either of two seemingly disparate Casimir paradigms-the stress-tensor approach and the path-integral (or scattering) approach-and this work thus achieves an unexpected unification of these two otherwise quite distinct theoretical frameworks. But a theoretical technique is only as relevant as its practical implementations are useful, and for this reason we present three distinct numerical implementations of the FSC formulae, each of which poses a series of unique technical challenges. Finally, using our new theoretical paradigm and our practical implementations of it, we obtain new predictions of Casimir interactions in a number of experimentally relevant geometric and material configurations that would be difficult or impossible to treat with any other existing Casimir method.
by M. T. Homer Reid.
Ph.D.
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Tatur, Kevin. "Theoretical studies of long range interactions in quasi-one dimensional cylindrical structures." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003135.
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Schiefele, Jürgen. "Casimir-Polder interaction in second quantization." Phd thesis, Universität Potsdam, 2011. http://opus.kobv.de/ubp/volltexte/2011/5417/.
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The Casimir-Polder interaction between a single neutral atom and a nearby surface, arising from the (quantum and thermal) fluctuations of the electromagnetic field, is a cornerstone of cavity quantum electrodynamics (cQED), and theoretically well established. Recently, Bose-Einstein condensates (BECs) of ultracold atoms have been used to test the predictions of cQED. The purpose of the present thesis is to upgrade single-atom cQED with the many-body theory needed to describe trapped atomic BECs. Tools and methods are developed in a second-quantized picture that treats atom and photon fields on the same footing. We formulate a diagrammatic expansion using correlation functions for both the electromagnetic field and the atomic system.
The formalism is applied to investigate, for BECs trapped near surfaces, dispersion interactions of the van der Waals-Casimir-Polder type, and the Bosonic stimulation in spontaneous decay of excited atomic states. We also discuss a phononic Casimir effect, which arises from the quantum fluctuations in
an interacting BEC.Die durch (quantenmechanische und thermische) Fluktuationen des elektromagnetischen Feldes hervorgerufene Casimir-Polder-Wechselwirkung zwischen einem elektrisch neutralen Atom und einer benachbarten Oberfläche stellt einen theoretisch gut untersuchten Aspekt der Resonator-Quantenelektrodynamik (cavity quantum electrodynamics, cQED) dar. Seit kurzem werden atomare Bose-Einstein-Kondensate (BECs) verwendet, um die theoretischen Vorhersagen der cQED zu überprüfen. Das Ziel der vorliegenden Arbeit ist es, die bestehende cQED Theorie für einzelne Atome mit den Techniken der Vielteilchenphysik zur Beschreibung von BECs zu verbinden. Es werden Werkzeuge und Methoden entwickelt, um sowohl Photon- als auch Atom-Felder gleichwertig in zweiter Quantisierung zu beschreiben. Wir formulieren eine diagrammatische Störungstheorie, die Korrelationsfunktionen des elektromagnetischen Feldes und des Atomsystems benutzt. Der Formalismus wird anschließend verwendet, um für in Fallen nahe einer Oberfläche gehaltene BECs Atom-Oberflächen-Wechselwirkungen vom Casimir-Polder-Typ und die bosonische Stimulation des spontanen Zerfalls angeregter Atome zu untersuchen. Außerdem untersuchen wir einen phononischen Casimir-Effekt, der durch die quantenmechanischen Fluktuationen in einem wechselwirkenden BEC entsteht.
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Intravaia, Francesco. "Effet Casimir et interaction entre plasmons de surface." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2005. http://tel.archives-ouvertes.fr/tel-00009755.
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Dans cette thèse on discute l'influence des plasmons de surfaces sur l'effet Casimir entre deux miroirs métalliques plans et parallèles placés à une distance arbitraire. En utilisant le model plasma pour décrire la réponse optique du métal, on exprime l'énergie de Casimir comme une somme des contributions associées aux modes évanescents relatifs aux plasmons de surface et aux modes propagatifs de la cavité. Contrairement à une ce qu'on pouvait attendre, la contribution des modes plasmoniques est essentielle à toute distance afin d'assurer le correct résultat pour l'énergie de Casimir. Un des deux modes plasmoniques génère une contribution répulsive qui compense la contribution attractive provenant des modes propagatifs de la cavité, alors que les deux contributions, prises séparément, sont beaucoup plus importantes que la valeur réelle pour l'énergie de Casimir. Cela suggère qu'il est possible d'ajuster le signe de la force de Casimir en manipulant les plasmons de surface.
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Haakh, Harald Richard. "Cavity QED with superconductors and its application to the Casimir effect." Master's thesis, Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2009/3256/.
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Diese Diplomarbeit untersucht den Casimir-Effekt zwischen normal- und supraleitenden Platten über einen weiten Temperaturbereich, sowie die Casimir-Polder-Wechselwirkung zwischen einem Atom und einer solchen Oberfläche. Hierzu wurden vorwiegend numerische und asymptotische Rechnungen durchgeführt. Die optischen Eigenschaften der Oberflächen werden dann aus dielektrischen Funktionen oder optischen Leitfähigkeiten erhalten.
Wichtige Modellen werden vorgestellt und insbesondere im Hinblick auf ihre analytischen und kausalen Eigenschaften untersucht.
Es wird vorgestellt, wie sich die Casimir-Energie zwischen zwei normalleitenden Platten berechnen lässt. Frühere Arbeiten über den in allen metallischen Kavitäten vorhandenen Beitrag von Oberflächenplasmonen zur Casimir-Wechselwirkung wurden zum ersten mal auf endliche Temperaturen erweitert. Für Supraleiter wird eine analytische Fortsetzung der BCS-Leitfähigkeiten zu rein imaginären Frequenzen, sowohl innerhalb wie außerhalb des schmutzigen Grenzfalles verschwindender mittlerer freier Weglänge vorgestellt. Es wird gezeigt, dass die aus dieser neuen Beschreibung erhaltene freie Casimir-Energie in bestimmten Bereichen der Materialparameter hervorragend mit der im Rahmen des Zwei-Fluid-Modells für den Supraleiter berechneten übereinstimmt. Die Casimir-Entropie einer supraleitenden Kavität erfüllt den Nernstschen Wärmesatz und weist einen charakteristischen Sprung beim Erreichen des supraleitenden Phasenübergangs auf. Diese Effekte treten ebenfalls in der magnetischen Casimir-Polder-Wechselwirkung eines Atoms mit einer supraleitenden Oberfläche auf.
Es wird ferner gezeigt, dass die magnetische Dipol-Wechselwirkung eines Atomes mit einem Metall sehr stark von den dissipativen Eigenschaften und insbesondere von den Oberflächenströmen abhängt. Dies führt zu einer starken Unterdrückung der magnetischen Casimir-Polder-Energie bei endlichen Temperaturen und Abständen oberhalb der thermischen Wellenlänge. Die Casimir-Polder-Entropie verletzt in einigen Modellen den Nernstschen Wärmesatz.Ähnliche Effekte werden für den Casimir-Effekt zwischen Platten kontrovers diskutiert. In den entsprechenden elektrischen Dipol-Wechselwirkungen tritt keiner dieser Effekte auf.
Die Ergebnisse dieser Arbeit legen nahe, das bekannte Plasma-Modells als Grenzfall eines Supraleiters bei niedrigen Temperaturen (bekannt als London-Theorie) zu betrachten, statt als Beschreibung eines normales Metalles.
Supraleiter bieten die Möglichkeit, die Dissipation der Oberflächenströme in hohem Maße zu steuern. Dies könnte einen experimentellen Zugang zu den optischen Eigenschaften von Metallen bei niedrigen Frequenzen erlauben, die eng mit dem thermischen Casimir-Effekt verknüpft sind. Anders als in entsprechenden Mikrowellen-Experimenten sind hierbei die Energien und Impulse unabhängige Größen. Die Messung der Oberflächenwechselwirkung zwischen Atomen und Supraleitern ist mit den heute verfügbaren Atomfallen auf Mikrochips möglich und der magnetische Anteil der Wechselwirkung sollte spektroskopischen Techniken zugänglich seinThis thesis investigates the Casimir effect between plates made of normal and superconducting metals over a broad range of temperatures, as well as the Casimir-Polder interaction of an atom to such a surface. Numerical and asymptotical calculations have been the main tools in order to do so. The optical properties of the surfaces are described by dielectric functions or optical conductivities, which are reviewed for common models and have been analyzed with special weight on distributional properties and causality. The calculation of the Casimir energy between two normally conducting plates (cavity) is reviewed and previous work on the contribution to the Casimir energy due to the surface plasmons, present in all metallic cavities, has been generalized to finite temperatures for the first time. In the field of superconductivity, a new analytical continuation of the BCS conductivity to to purely imaginary frequencies has been obtained both inside and outside the extremely dirty limit of vanishing mean free path. The Casimir free energy calculated from this description was shown to coincide well with the values obtained from the two fluid model of superconductivity in certain regimes of the material parameters. The Casimir entropy in a superconducting cavity fulfills the third law of thermodynamics and features a characteristic discontinuity at the phase transition temperature. These effects were equally encountered in the Casimir-Polder interaction of an atom with a superconducting wall. The magnetic dipole coupling of an atom to a metal was shown to be highly sensible to dissipation and especially to the surface currents. This leads to a strong quenching of the magnetic Casimir-Polder energy at finite temperature. Violations of the third law of thermodynamics are encountered in special models, similar to phenomena in the Casimir-effect between two plates, that are debated controversely. None of these effects occurs in the analog electric dipole interaction. The results of this work suggest to reestablish the well-known plasma model as the low temperature limit of a superconductor as in London theory rather than use it for the description of normal metals. Superconductors offer the opportunity to control the dissipation of surface currents to a great extent. This could be used to access experimentally the low frequency optical response of metals, which is strongly connected to the thermal Casimir-effect. Here, differently from corresponding microwave experiments, energy and momentum are independent quantities. A measurement of the total Casimir-Polder interaction of atoms with superconductors seems to be in reach in today’s microchip-based atom-traps and the contribution due to magnetic coupling might be accessed by spectroscopic techniques
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Maury, Axel. "Effet Casimir-Polder sur des atomes piégés." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066327/document.
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Ce travail de thèse présente la modélisation théorique de l'expérience FORCA-G. L'objectif de cette expérience est la mesure des interactions à courte portée entre des atomes piégés dans un réseau optique et une surface massive à une grande précision. Nous nous sommes intéressés plus particulièrement à l'effet Casimir-Polder induit par la surface sur les atomes. Le but était de fournir la prédiction la plus précise possible des états atomiques. Ceci a consisté à considérer les effets de la température sur l'interaction Casimir-Polder et modéliser la surface de la manière la plus réaliste possible. Afin de résoudre le problème de divergence qu'impliquait un traitement perturbatif de l'interaction atome-surface, nous avons développé une méthode numérique pour un traitement non-perturbatif de l'interaction Casimir-Polder et modélisé l'interaction atome-surface à très courte distance par un potentiel de Lennard-Jones. Chaque effet et incertitude sur les états atomiques ont été évalués afin de déterminer s'ils seraient observables ou un facteur limitant en regard de la précision visée par l'expérience. Enfin nous nous sommes intéressés au cas d'un déséquilibre thermique entre la température du miroir et la température de l'environnement qui pourrait être induit par les lasers en présence ou un laser de chauffage. Nous avons calculé la correction du potentiel Casimir-Polder due au déséquilibre et évalué l'effet sur les niveaux d'énergie atomiques pour déterminer si cet effet pouvait être mesuréThis thesis presents the theoretical modeling of the experiment FORCA-G. The purpose of this experiment is to measure short-range interactions between trapped atoms in an optical lattice and a massive surface with a high precision. We are focused on Casimir-Polder effect induced by the surface on the atoms. The aim was to give the most possible precise prediction of atomic states. This work took the temperature effects on Casimir-Polder interaction into account, modelled the surface of the experiment. In order to solve the divergence problem due to the perturbative treatment of the atom-surface interaction, we developed a digital method for a non-perturbative treatment of the Casimir-Polder interaction and modelled the short-range atom-surface interaction by a Lennard-Jones potential. Each effect and uncertainties on the atomic states were evaluated so that we know if they could be observable or a limiting factor compared to the experiment precision. Finally we were focused on an out of thermal equilibrium situation between the miroir and environment temperature which may be induced by the lasers. We computed the correction to the Casimir-Polder potential due to this disequilibrium and evaluated the effect on the atomic states
Books on the topic "Casimir interactions"
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Sernelius, Bo E. Fundamentals of van der Waals and Casimir Interactions. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99831-2.
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Sernelius, Bo E. Fundamentals of van der Waals and Casimir Interactions. Springer, 2018.
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Sernelius, Bo E. Fundamentals of van der Waals and Casimir Interactions. Springer, 2018.
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Tiwari, Sandip. Electromagnetic-matter interactions and devices. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198759874.003.0006.
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This chapter explores electromagnetic-matter interactions from photon to extinction length scales, i.e., nanometer of X-ray and above. Starting with Casimir-Polder effect to understand interactions of metals and dielectrics at near-atomic distance scale, it stretches to larger wavelengths to explore optomechanics and its ability for energy exchange and signal transduction between PHz and GHz. This range is explored with near-quantum sensitivity limits. The chapter also develops the understanding phononic bandgaps, and for photons, it explores the use of energetic coupling for useful devices such as optical tweezers, confocal microscopes and atomic clocks. It also explores miniature accelerators as a frontier area in accelerator physics. Plasmonics—the electromagnetic interaction with electron charge cloud—is explored for propagating and confined conditions together with the approaches’ possible uses. Optoelectronic energy conversion is analyzed in organic and inorganic systems, with their underlying interaction physics through solar cells and its thermodynamic limit, and quantum cascade lasers.
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Milonni, Peter W. An Introduction to Quantum Optics and Quantum Fluctuations. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199215614.001.0001.
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This book is an introduction to quantum optics for students who have studied electromagnetism and quantum mechanics at an advanced undergraduate or graduate level. It provides detailed expositions of theory with emphasis on general physical principles. Foundational topics in classical and quantum electrodynamics, including the semiclassical theory of atom-field interactions, the quantization of the electromagnetic field in dispersive and dissipative media, uncertainty relations, and spontaneous emission, are addressed in the first half of the book. The second half begins with a chapter on the Jaynes-Cummings model, dressed states, and some distinctly quantum-mechanical features of atom-field interactions, and includes discussion of entanglement, the no-cloning theorem, von Neumann’s proof concerning hidden variable theories, Bell’s theorem, and tests of Bell inequalities. The last two chapters focus on quantum fluctuations and fluctuation-dissipation relations, beginning with Brownian motion, the Fokker-Planck equation, and classical and quantum Langevin equations. Detailed calculations are presented for the laser linewidth, spontaneous emission noise, photon statistics of linear amplifiers and attenuators, and other phenomena. Van der Waals interactions, Casimir forces, the Lifshitz theory of molecular forces between macroscopic media, and the many-body theory of such forces based on dyadic Green functions are analyzed from the perspective of Langevin noise, vacuum field fluctuations, and zero-point energy. There are numerous historical sidelights throughout the book, and approximately seventy exercises.
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Fabre, Claude, Vahid Sandoghdar, Nicolas Treps, and Leticia F. Cugliandolo, eds. Quantum Optics and Nanophotonics. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198768609.001.0001.
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Over the last few decades, the quantum aspects of light have been explored and major progress has been made in understanding the specific quantum aspects of the interaction between light and matter. Single photons are now routinely produced by single molecules on surfaces, vacancies in crystals, and quantum dots. The micrometre and nanometre scale is also the privileged range where fluctuations of electromagnetic fields manifest themselves through the Casimir force. The domain of classical optics has recently seen many exciting new developments, especially in the areas of nano-optics, nano-antennas, metamaterials, and optical cloaking. Approaches based on single-molecule detection and plasmonics have provided new avenues for exploring light–matter interaction at the nanometre scale. All these topics have in common a trend to consider and use smaller and smaller objects, down to the micrometre, nanometre, and even atomic range, a region where one gradually passes from classical physics to quantum physics. The summer school held in Les Houches in July 2013 treated all these subjects lying at the frontier between nanophotonics and quantum optics, in a series of lectures given by world experts in the domain and gathered together in the present volume.
Book chapters on the topic "Casimir interactions"
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Sernelius, Bo E. "Casimir Interaction." In Fundamentals of van der Waals and Casimir Interactions, 259–71. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99831-2_12.
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Johnson, Steven G. "Numerical Methods for Computing Casimir Interactions." In Casimir Physics, 175–218. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20288-9_6.
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Spruch, Larry. "An Overview of Long-Range Casimir Interactions." In Long-Range Casimir Forces, 1–71. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4899-1228-2_1.
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Sernelius, Bo E. "Dispersion Interaction in Planar Structures." In Fundamentals of van der Waals and Casimir Interactions, 273–337. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99831-2_13.
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Sernelius, Bo E. "Dispersion Interaction in Spherical Structures." In Fundamentals of van der Waals and Casimir Interactions, 339–71. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99831-2_14.
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Sernelius, Bo E. "Dispersion Interaction in Cylindrical Structures." In Fundamentals of van der Waals and Casimir Interactions, 373–92. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99831-2_15.
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Sernelius, Bo E. "Van der Waals Interaction in Spherical Structures." In Fundamentals of van der Waals and Casimir Interactions, 209–32. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99831-2_10.
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Sernelius, Bo E. "Van der Waals Interaction in Cylindrical Structures." In Fundamentals of van der Waals and Casimir Interactions, 233–55. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99831-2_11.
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Sernelius, Bo E. "Van der Waals Interaction in Planar Structures." In Fundamentals of van der Waals and Casimir Interactions, 153–207. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99831-2_9.
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Sernelius, Bo E. "Introduction." In Fundamentals of van der Waals and Casimir Interactions, 1–5. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99831-2_1.
Full textConference papers on the topic "Casimir interactions"
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Uvarova, Liudmila, and Sergey Babarin. "Transport processes of impurities in nano-volumes with Casimir force interactions." In CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5114559.
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Linares, R., H. A. Morales-Técotl, O. Pedraza, George Alverson, Pran Nath, and Brent Nelson. "Casimir force for a scalar field in a single brane world." In SUSY09: 7th International Conference on Supersymmetry and the Unification of Fundamental Interactions. AIP, 2010. http://dx.doi.org/10.1063/1.3327682.
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Bognash, Mohamed, and Samuel F. Asokanthan. "Dynamic Behavior of a Class of Casimir Actuated NEM Switches." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86296.
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Dynamic behavior of a cantilever type nano-switch actuated by pure Casimir force is investigated. Residual surface stress, surface elasticity and intermolecular forces are included in Euler–Bernoulli beam model. Knudsen number dependent squeeze-film air damping model and an asperity-based contact model are incorporated. The proposed model is inherently nonlinear due to interactions between the different nonlinear physics. An approximate analytical approach based on Galerkin’s method has been employed for predicting transient dynamic responses, since no exact solutions are available. Predicted responses show that the beam tip hits the substrate and bounces before making a permanent contact. Actuation of the switch via pure Casimir force is demonstrated for certain length and gap combinations. Initial contact time which governs the switch performance, and the deflections under non-closure condition are also quantified. This study is envisaged to provide useful insights for the future design of Casimir actuated NEM switches.
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Shen, Sheng, Anastassios Mavrokefalos, Poetro Sambegoro, and Gang Chen. "Probing Nanoscale Heat and Force Interactions Using Atomic Force Microscopes (AFM)." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23329.
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Many devices and instruments such as magnetic hard disk drives and atomic force microscopes (AFM) rely on the stable operation of their small probing heads at nanoscale gaps. Due to the small scale of the probing heads, the force interactions (Casimir force and electrostatic force) between the small probes and the surrounding become more significant. The local heating caused by read/write electric currents in hard disk drives or probing laser beams in AFM on the probes inevitably leads to the heat transfer between them and the surrounding. The nanoscale heat and force interactions play a critical role in the performances of those instruments. In this paper, we use a bimaterial AFM cantilever to measure the nanoscale air heat conduction, radiation and force between a microsphere and a substrate. The resulting “heat transfer-distance” and “force-distance” curves clearly show the strong dependence of nanoscale interactions with gap distances.
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Khoshnoud, Farbod, Clarence W. de Silva, and Houman Owhadi. "Analysis and Design of a Nano-Electromechanical Vibration Sensor." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37797.
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Design and analysis of an embedded nano-electromechanical capacitive sensor for vibration monitoring is presented in this paper. In this sensor, vibration sensing is carried out by detecting the oscillations of a Single Walled Carbon Nanotube (SWCNT). The SWCNT is excited when it is subjected to a base motion corresponding to the measured vibration. Acquisition of the sensor signal is performed by a capacitance circuit, using the electric charge generated in the Carbon Nanotube (CNT). A modulation in the charge in the CNT, due to change in the capacitance, leads to a modulation in the CNT’s conductance and is used in measuring the input vibration. Vibration properties of the CNTs are obtained by molecular mechanics and finite element analysis where atoms are modeled as particles with an equilibrium distance equal to the bond length, and the bonded interactions of atoms are modeled as flexible beams. Stiffness coefficients of the atomic bonds are modeled using Morse atomic potential. A bridge circuit is utilized in this sensor to compensate for temperature and other environmental effects. When the CNT is in the vicinity of the gate underneath the tube, at a distance in the range of 1 nanometer to 1 micrometer, Casimir pressure, due to quantum fluctuations in the zero point electromagnetic field, can attract the CNT to the gate. This unwanted applied force on the tube may lead to inaccurate measurement of the vibration. In order to study the effect of Casimir pressure on the CNT a simplified model of the Casimir effect, for parallel surfaces, is adopted. This model can assist in achieving better accuracy in vibration measurement, and the sensor can be calibrated accordingly to account for the Casimir attractive force. The paper presents the physical and operational details of the sensor. This device is particularly useful for precise and effective sensing of vibration for machinery and structural condition monitoring and fault diagnosis.
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Au, C. K. "Time-ordered diagrammatic approach to the two-photon exchange potential: An examination of the Casimir effects in long range EM interactions." In Relativistic, quantum electrodynamics, and weak interaction effects in atoms. AIP, 1989. http://dx.doi.org/10.1063/1.38426.
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Wilkowski, David, Aik Chan Eng, Syed Abdullah Aljunid, Giorgio Adamo, athanasios laliotis, Martial Ducloy, and Nikolay Zheludev. "Tuning the surface Casimir-Polder interaction." In Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology, edited by Selim M. Shahriar and Jacob Scheuer. SPIE, 2019. http://dx.doi.org/10.1117/12.2515408.
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INTRAVAIA, FRANCESCO, and CARSTEN HENKEL. "CASIMIR INTERACTION BETWEEN ABSORBING AND META MATERIALS." In Proceedings of the MG11 Meeting on General Relativity. World Scientific Publishing Company, 2008. http://dx.doi.org/10.1142/9789812834300_0510.
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HAAKH, H., F. INTRAVAIA, and C. HENKEL. "THERMAL EFFECTS IN THE MAGNETIC CASIMIR-POLDER INTERACTION." In Proceedings of the Ninth Conference. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814289931_0021.
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Barcellona, Pablo, and Stefan Yoshi Buhmann. "Body-assisted Casimir-Polder interaction between two chiral molecules." In 2016 Progress in Electromagnetic Research Symposium (PIERS). IEEE, 2016. http://dx.doi.org/10.1109/piers.2016.7734945.
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