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Dissertations / Theses on the topic 'Graphene Resonators'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 September 2023

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1

Tsioutsios, Ioannis. "Mechanical resonators based on graphene and carbon nanotubes." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/393994.

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Los resonadores mecánicos basados en grafeno y nanotubos de carbono han atraído recientemente una considerable atención, debido a la gran variedad de propiedades extraordinarias que exhiben. La reducida dimensión intrínseca a su naturaleza hace de estos materiales candidatos ideales para el estudio de la mecánica en la nano-escala. Su reducida masa les hace extremadamente sensibles a fuerzas externas y masas adsorbidas, lo cual es prometedor para su uso como sensores. A ello se suma que estos sistemas pueden ajustar ampliamente su frecuencia de vibración llegando hasta GHz. Además, muestran f

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2

Weber, Peter. "Graphene mechanical resonators coupled to superconducting microwave cavities." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/404668.

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In recent years, mechanical resonators based on graphene have attracted considerable interest as nanoelectromechanical systems (NEMS). Graphene NEMSs allow for exceptional properties such as high mechanical strength, high frequencies and quality factors, tunable mechanical properties, and ultra-low mass. As a consequence, these systems are promising to investigate motion in the quantum regime, probe rich nonlinear phenomena, sense minuscule masses and forces, and study surface science. However, a central challenge in graphene NEMS research is the coupling of the mechanical vibrations to ext

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3

Chen, Tao. "Design, fabrication and characterisation of graphene electromechanical resonators." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10538.

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In this thesis, the design, fabrication and characterisation of graphene electromechanical resonators have been presented. Graphene features ultrahigh Young’s modulus and large surface to volume ratio that make it ideal for radio frequency (RF) components, sensors and other micro/nano-electromechanical systems (MEMS/NEMS). A novel batch fabrication process for graphene electromechanical resonators has been developed by using poly-Si film as sacrificial layer. Previously reported fabrication processes of graphene resonators use SiO2 as sacrificial layer only because graphene is visible on 300nm

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4

Schwender, Jill. "Mass sensing with graphene and carbon nanotube mechanical resonators." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/663907.

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In recent years, carbon nanotube and graphene mechanical resonators have attracted considerable attention because of their unique properties. Their high resonance frequencies, high quality factors and their ultra-low mass turn them into exceptional sensors of minuscule external forces and masses. Their sensing capabilities hold promise for scanning probe microscopy, magnetic resonance imaging and mass spectrometry. Moreover, they are excellent probes for studying mechanical motion in the quantum regime, investigating nonlinear dynamics and carrying out surface science experiments on crystallin

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5

Hussein, Siham Mohamed Ahmed. "Chemical sensing using novel silicon photonic devices and materials." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/chemical-sensing-using-novel-silicon-photonic-devices-and-materials(463f5291-46a3-41c1-afc1-decc3063eada).html.

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This thesis presents a detailed study of chip based silicon photonic waveguide technologies for chemical sensing applications. The project specifically focuses on the use of strip and slot waveguide based micro-ring resonators (MRRs) integrated with graphene and graphene oxide (GO) as potential functional sensor coatings. The primary objective is to understand the effect of graphene/GO on the optical properties of such a device, to assess performance in bio-/chemical sensing applications and to identify ways in which such a device may be optimised. A detailed analysis of how the MRR cavity opt

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6

Knapp, Marius [Verfasser], and Oliver [Akademischer Betreuer] Ambacher. "Graphene - from synthesis to the application as a virtually massless electrode material for bulk acoustic wave resonators." Freiburg : Universität, 2018. http://d-nb.info/1179694619/34.

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7

Ronseaux, Pauline. "Graphène CVD macroscopique en régime de supraconductivité de proximité : applications à l'électronique flexible et radiofréquence." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY087/document.

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La supraconductivité induite par effet de proximité dans du graphène CVD macroscopique décoré de nanoparticules d'étain (G/Sn) est le thème central de cette thèse. Dans ce manuscrit, deux projets expérimentaux sont présentés. Le premier de ces projets a consisté à développer et étudier un nouveau matériau manipulable et flexible au sein duquel les corrélations supraconductrices s'étendent à des échelles macroscopiques. Ce matériau est un film composite qui résulte de l'empilement de trois ingrédients originaux: un film fin de parylène d'une épaisseur de quelques micromètres, une monocouche de

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8

Lee, Jaesung. "Optically Transduced Two-Dimensional (2D) Resonant Nanoelectromechanical Systems and Their Emerging Applications." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1474972552266241.

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9

Morvan, Alexis. "Honeycomb lattices of superconducting microwave resonators : Observation of topological Semenoff edge states." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS037/document.

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Cette thèse décrit la réalisation et l’étude de réseaux bidimensionnels de résonateurs supraconducteurs en nid d’abeille. Ce travail constitue un premier pas vers la simulation de systèmes de la matière condensée avec des circuits supraconducteurs. Ces réseaux sont micro-fabriqués et sont constitués de plusieurs centaines de sites. Afin d’observer les modes propres qui y apparaissent dans une gamme de fréquence entre 4 et 8 GHz, nous avons mis au point une technique d’imagerie. Celle-ci utilise la dissipation locale créée par un laser avec lequel nous pouvons adresser chaque site du réseau. No

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10

Siyambalapitiya, Chamila Shyamalee. "Model and Validation of Static and Dynamic Behavior of Passive Diamagnetic Levitation for Energy Harvesting." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4406.

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This dissertation reports the investigation conducted on the static and dynamic behavior of the passive diamagnetic levitation systems. Attachment of a device to a substrate hinders the optimum performance ability of vibrating devices by altering the dynamic behavior of the moving part whilst introducing higher overall stiffness. The significance of this effect is prominent especially in vibration based energy harvesters as higher stiffness elevates the resonance frequency of the system, making it difficult to tune into ambient low frequencies. Other advantages of the proposed method are given

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11

Gablech, Imrich. "CMOS kompatibilní piezoelektrický rezonátor s FET strukturou pro řízení vlastností grafenové monovrstvy." Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2018. http://www.nusl.cz/ntk/nusl-387739.

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Práce je zaměřena na výzkum nové struktury umožňující charakterizaci fyzikálních vlastností grafenu při přesně řízených podmínkách. Návrh spojuje MEMS piezoelektrický rezonátor spolu s Hall Bar/FET strukturou. Tento přístup umožňuje měnit vlastnosti grafenu odděleně nebo společně dvěma metodami. Mechanický způsob je založen na relativní deformaci způsobené rezonátorem, na kterém je umístěna grafenová monovrstva. Navrhovaná struktura umožňuje měřit vlastnosti grafenu vyvolané pouze změnou mechanického pnutí a frekvencí nucených kmitů bez vlivu vnějšího elektrického pole. Druhý přístup přidává m

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12

Böhm, Julian. "Phénomènes de transport originaux dans des expériences micro-ondes via la mise en forme spatiale et spectrale." Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4048/document.

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Le transport des ondes joue un rôle majeur dans les systèmes de communication comme le Wifi ou les fibres optiques. Les principaux problèmes rencontrés dans ces systèmes concernent la protection contre les intrusions, la consommation d’énergie et le filtrage modal. Nous proposons différentes expériences micro-ondes mettant toutes en œuvre une mise en forme des ondes, pour traiter ces problèmes. Dans une cavité micro-ondes, des états de diffusion particuliers sont générés en s’appuyant uniquement sur des mesures de transmission et sur le formalisme du temps de retard de Wigner-Smith. Ces états

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13

BAYAT, AHMAD. "RF characterization and applications of carbon based composites." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2715629.

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Graphene is a monolayer of carbon atoms with remarkable electronic and mechanical properties. The attractive electronic properties of thin and thick films made of carbon nanotubes (CNTs) and graphene are increasingly being exploited for environmental and biological sensors. In particular, their sensitivity, selectivity, fast response time, ability to operate at room temperature, and their passive nature (no power consumption) provide competitive advantages of CNTs in sensor applications. However, their design as RF wireless sensors requires the integration of an antenna with the sensor elemen

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14

Chen, Changyao. "Graphene NanoElectroMechanical Resonators and Oscillators." Thesis, 2013. https://doi.org/10.7916/D8TT4Z6J.

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Made of only one sheet of carbon atoms, graphene is the thinnest yet strongest material ever exist. Since its discovery in 2004, graphene has attracted tremendous research effort worldwide. Guaranteed by the superior electrical and excellent mechanical properties, graphene is the ideal building block for NanoElectroMechanical Systems (NEMS). In the first parts of the thesis, I will discuss the fabrications and measurements of typical graphene NEMS resonators, including doubly clamped and fully clamped graphene mechanical resonators. I have developed a electrical readout technique by using grap

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15

Hu, I.-Fan, and 胡逸凡. "Fabrication and Measurements of Graphene Resonators." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/xbexyq.

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碩士<br>國立臺灣大學<br>物理學研究所<br>107<br>Graphene, which is a single layer of carbon atoms bonded in a hexagonal lattice, is well known for its good electrical and mechanical properties. Lots of special properties such as large Young’s modulus, high thermal conductance, and gate tunable carrier concentration make it an ideal material for building MEMS device. Electromechanical switch, varactor, and radio frequency switch have been reported in the literature. In addition, the first graphene resonator was built in 2007. After this work, lots of effort has been devoted to studying and improving the perfo

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16

Parmar, Marsha Mary. "Investigation of Nonlinearities in Graphene Based NEMS." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2704.

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Nanoelectromechanical systems (NEMS) have drawn considerable attention towards several sensing applications such as force, spin, charge and mass. These devices due to their smaller size, operate at very high frequencies (MHz - GHz) and have very high quality factors (102 -105). However, the early onset of nonlinearity limits the linear dynamic range of these devices. In this work we investigate the nonlinearities and their effect on the performance of graphene based NEMS. Electromechanical devices based on 2D materials are extremely sensitive to strain. We studied the effect of strain on th

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17

Parmar, Marsha Mary. "Investigation of Nonlinearities in Graphene Based NEMS." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2704.

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Nanoelectromechanical systems (NEMS) have drawn considerable attention towards several sensing applications such as force, spin, charge and mass. These devices due to their smaller size, operate at very high frequencies (MHz - GHz) and have very high quality factors (102 -105). However, the early onset of nonlinearity limits the linear dynamic range of these devices. In this work we investigate the nonlinearities and their effect on the performance of graphene based NEMS. Electromechanical devices based on 2D materials are extremely sensitive to strain. We studied the effect of strain on th

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18

Lee, Brian Sahnghoon. "Scaling high performance photonic platforms for emerging applications: from air-cladded resonators to graphene modulators." Thesis, 2020. https://doi.org/10.7916/d8-x9sy-6h47.

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Silicon photonics accelerated the advent of complex integrated photonic systems where multiple devices and elements of the circuits synchronize to perform advanced functions such as beam formation for range detection, quantum computation, spectroscopy, and high-speed communication links. The key ingredient for silicon's growing dominance in integrated photonics is scalability: the ability to monolithically integrate large number of devices. There are emerging device designs and material platforms compatible with silicon photonics that offer performances superior to silicon alone, yet th

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19

Samanta, Chandan. "Internal resonances and nonlinearities in atomically thin resonators." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5293.

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The advent of carbon nanotubes (CNTs) and atomically thin membranes such as Graphene and layered transition metal chalcogenides (TMDs) have spurred research in the area of Nanoelectromechanical Systems (NEMS) due to their extraordinary mechanical properties and ultralow mass density. These properties make the resonators extremely responsive to external stimuli. This is particularly important for research from both application and fundamental points of view. Nonlinearities in these devices play a vital role in the dynamics as dimensions are reduced to atomic scale. The primary emphasis of this

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20

Yen, Tzu-Hsiang, and 顏子翔. "Nonlinear thermo-optic effect in graphene oxide on silicon micro-ring resonator." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/26920912063202743958.

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碩士<br>國立中山大學<br>光電工程學系研究所<br>104<br>This thesis focuses on the nonlinear effects of the Si micro-ring resonators on silicon-on-insulator platform. A high extinction ratio and narrowband filter can be achieved by using a high-quality-factor micro-ring resonators, which typically has a small radius and a wider gap between the ring and the straight bus waveguide. As we look for higher quality factor, the storage of photon energy inside the ring is also enhanced, leading to stronger nonlinear effects. Such a field enhancement in the ring resonator gives rise to two photon absorption (TPA) and its

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21

Arash, Behrouz. "Molecular dynamics studies on application of carbon nanotubes and graphene sheets as nano-resonator sensors." 2013. http://hdl.handle.net/1993/22278.

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The main objective of the research is to study the potential application of carbon nanotubes and graphene sheets as nano-resonator sensors in the detection of atoms/molecules with vibration and wave propagation analyses. It is also aimed to develop and examine new methods in the design of nano-resonator sensors for differentiating distinct gas atoms and different macromolecules, such as DNA molecules. The hypothesis in the detection techniques is that atoms or molecules attached on the surface of the nano-resonator sensors would induce a recognizable shift in the resonant frequency of or wave

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