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Dissertations / Theses on the topic 'Phonon resonance'

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Published: 5 June 2025
Last updated: 1 August 2025

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1

Drachenko, Oleksiy. "Resonance Magnetophonon Inter Sous-Bandes dans les Structures Unipolaires à Cascades Quantiques." Phd thesis, Université Paul Sabatier - Toulouse III, 2004. http://tel.archives-ouvertes.fr/tel-00008037.

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Cette thèse aborde la problématique de la durée de vie des électrons dans des puits quantiques unipolaires soumis à un fort champ magnétique selon l'axe de confinement. Plus particulièrement, le blocage de l'émission de phonons optiques longitudinaux en régime de confinement des électrons à 0-dimension est clairement démontré par la mise en évidence d'oscillations quantiques de la durée de vie. Cet effet est baptisé « résonance magnétophonon inter sous-bandes ». Le blocage de l'émission de phonons LO a été détecté sur la mesure de l'intensité de lasers à cascades quantiques GaAs/GaAlAs, émetta
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2

Chen, Sen-Yong. "Phonon Modulation by Polarized Lasers for Material Modification." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5159.

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Magnetic resonance imaging (MRI) has become one of the premier non-invasive diagnostic tools, with around 60 million MRI scans applied each year. However, there is a risk of thermal injury due to radiofrequency (RF) induction heating of the tissue and implanted metallic device for the patients with the implanted metallic devices. Especially, MRI of the patients with implanted elongated devices such as pacemakers and deep brain stimulation systems is considered contraindicated. Many efforts, such as determining preferred MRI parameters, modifying magnetic field distribution, designing new stru
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3

Ardito, Fábio Machado 1984. "Mecanismos de alargamento de níveis de Landau em grafeno = um estudo por espalhamento Raman = Landau level broadening mechanisms in graphene: a Raman scattering study." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276935.

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Orientadores: Eduardo Granado Monteiro da Silva, Fernando Iikawa<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-28T03:52:30Z (GMT). No. of bitstreams: 1 Ardito_FabioMachado1984-_D.pdf: 17276184 bytes, checksum: 26e823f6c84e2068348c69f11dbd1424 (MD5) Previous issue date: 2015<br>Resumo: O célebre efeito Hall quântico semi-inteiro no grafeno é uma consequência direta dos níveis de Landau característicos previstos pela equação de Dirac. Apesar de se saber que os níveis de Landau devam ser tão estreitos quanto pos
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4

Mukherjee, Anadi. "Two Photon Resonant Picosecond Pulse Propagation in Lithium Vapor." Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc331546/.

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The work of this dissertation has been to prove that the coherence of multiphoton excitation can be studied by an appropriately phased and time delayed sequence of pulses. An application of this fundamental study of coherence has been made for the enhancement of third harmonic generation. The coherent recovery of the energy lost to the two photon absorption process enalled a larger propagation distance for the fundamental than in an interaction which is incoherent or coherent, but not using a 90 degree phase shifted pulse pair. Phase matching over this longer propagation distance gave an enha
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5

Geondzhian, Andrey. "Resonant inelastic X-ray scattering as a probe of exciton-phonon coupling." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY077/document.

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Les phonons contribuent à la diffusion inélastique résonante des rayons X (RIXS) du fait du couplage entre les degrés de liberté électronique et ceux du réseau. Contrairement à d'autres techniques sensibles aux interactions électron-phonon, la technique RIXS peut donner accès aux constantes de couplage dépendantes du moment. Des informations sur la dispersion de l'interaction électron-phonon sont très précieuses dans le contexte de la supraconductivité anisotrope conventionnelle et non conventionnelle.Nous avons considéré la contribution des phonons sur la diffusion RIXS d’un point de vue théo
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6

Osorio, Francisco Aparecido Pinto. "Magnetopolarons em heteroestruturas semicondutoras de baixa dimensionalidade." Universidade de São Paulo, 1992. http://www.teses.usp.br/teses/disponiveis/54/54131/tde-25062009-092513/.

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Nós calculamos o efeito da interação elétron-fonons longitudinais óticos (LO) sobre a energia de transição ls &#8594 2p+ entre os níveis de uma impureza doadora, localizada em um poço quântico de GaAs-AlxGa1-xAs. Nossos resultados para a energia de transição em função do campo magnético aplicado mostram claramente, que a saturação da energia de transição (efeito pinning) ocorre na energia dos fônons LO, em boa concordância com recentes dados experimentais. Obtemos também a massa de cíclotron de polarons confinados em fios quânticos quase-unidimensionais, com potencial de confinamento parabólic
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7

Osorio, Francisco Aparecido Pinto. "Efeitos polarônicos em estruturas semicondutoras em uma e duas dimensões." Universidade de São Paulo, 1988. http://www.teses.usp.br/teses/disponiveis/54/54131/tde-09032009-151729/.

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Neste trabalho estudamos os efeitos polarônicos sobre um gás de elétrons quase bidimensional presente em heteroestruturas semicondutoras (heterojunções e poços quânticos de GaAs-AlGaAs) sob a ação de um campo magnético uniforme aplicado na direção perpendicular a interface, através de teoria de perturbação de segunda ordem. Calculamos a massa ciclotrônica considerando a interação elétron-fonon LO e os efeitos de blindagem e não parabolicidade da banda de condução do GaAs. Os resultados obtidos são comparados com recentes dados experimentais de ressonância ciclotronica e apresentam ótima concor
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8

Giltrow, M. "Phonon study of vertical resonant structures." Thesis, Lancaster University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337346.

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9

Qassadi, AMAL MOHAMMED. "TWO-PHOTON DOUBLE RESONANCE SPECTROSCOPY IN IODINEMOLECULES." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1438620015.

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10

Mukherjee, Nandini. "Coherent Resonant Interaction and Harmonic Generation in Atomic Vapors." Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc332243/.

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This work examines the use of higher order multiphoton resonances in higher harmonic generation together with judicious exploitation of coherent interaction properties to achieve efficient harmonic generation. A detailed experimental study on third harmonic generation in two photon resonant coherent interaction and a theoretical study on four photon resonant coherent interaction have been conducted. Two photon resonant coheren propagation in lithium vapor (2S-4S and 2S-3D interaction) has been studied in detail as a function of phase and delay of the interacting pulse sequence. Under coherent
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11

Heraud, A. P. "Resonant phonon scattering in silicon and sapphire." Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353549.

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12

Liu, Ping Yi. "Réponse optique de InSb dans des conditions extrêmes de champ magnétique (B = 20T) et de température (T [égal ou inférieur à] 700 K)." Grenoble 1, 1991. http://www.theses.fr/1991GRE10165.

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Une etude originale de la structure de bande de insb intrinseque et de sa variation avec la temperature est effectuee en utilisant les techniques des hautes temperatures (300-700 k), du champ magnetique intense (0-20 t) et de l'optique dans l'infra-rouge et l'infra-rouge lointain. En suivant l'evolution de la reponse optique et magneto-optique avec la temperature, nous avons retrouve, dans le meme echantillon, pratiquement tous les principaux phenomenes etudies dans le passe mais uniquement aux temperatures inferieures a 300 k. Le changement de la structure de bande se manifeste dans la repons
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13

Rodrigues, Augusto da Silveira. "Nonlinear pulse propagation near a two-photon resonance." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/187455.

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The propagation of light pulses whose spectra are in the vicinity of a material two-photon resonance is studied. We derive the appropriate form for the nonlinear polarization. In the limit of fast material response (as compared to the pulse duration) we obtain a wave equation that includes a new term that reflects the nonlinearly dispersive nature of the propagation. We find that nonlinear dispersion leads to self-steepening, and asymmetric spectral modulation, which in the absence of linear dispersion eventually leads to an optical shock formation. However, second-order linear dispersion is e
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14

Choi, Hyun-jin. "Investigation of resonant Raman scattering in type II GaAs/A1As superlattices." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365725.

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15

Cohanoschi, Ion. "THREE-PHOTON ABSORPTION PROCESS IN ORGANIC DYES ENHANCED BY SURFACE PLASMON RESONANCE." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3891.

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Multi-photon absorption processes have received significant attention from the scientific community during the last decade, mainly because of their potential applications in optical limiting, data storage and biomedical fields. Perhaps, one of the most investigated processes studied so far has been two-photon absorption (2PA). These investigations have resulted in successful applications in all the fields mentioned above. However, 2PA present some limitations in the biomedical field when pumping at typical 2PA wavelengths. In order to overcome these limitations, three-photon absorption (3PA) p
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16

Somma, Carmine. "Coherent Multidimensional Off-resonant THz Spectroscopy on Semiconductors." Doctoral thesis, Humboldt-Universität zu Berlin, 2017. http://dx.doi.org/10.18452/18512.

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Zum ersten Mal konnte die kohärente Erzeugung von ultrakurzen Pulsen mit Feld stärken im MV/cm Bereich mit einem Spektralbereich von 0.1-30 THz im organischen Kristall DSTMS. Kohärente mehrdimensionale Terahertzspektroskopie (CMTS) hat sich zu einer wichtigen Methode zur Untersuchung der niederenergetischen Anregungen von Halbleitern and deren kohärenter Dynamik entwickelt. Eine neuartige CMTS Methode mit drei phasenstarren, zueinander zeitverzögerten Terahertzpulsen wurde entwickelt. Sie beruht auf der kollinearen Wechselwirkung der Pulse mit der Probe, sodass verschiedene Ordnungen des nicht
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17

Pallegoix, Louis. "High performance microwave photon counter and application to single spin magnetic resonance." Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASP028.

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Depuis plusieurs décennies, la détection de photons uniques dans les longueurs d'ondes optiques est réalisée de manière routinière dans nombre d'expériences. En revanche, le même type de détection dans les micro-ondes est une invention récente. Le schéma de détection est basé sur un mélange à quatre ondes, convertissant le photon à détecter et un photon de pompe en un autre photon plus l'excitation d'un bit quantique supraconducteur. L'excitation du bit quantique permet d'enregistrer l'évènement de conversion de fréquence, et donc d'effectivement détecter un photon micro-onde par lecture de l'
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18

White, Thomas P. "Theory of resonance and mode coupling in photonic crystal devices." Connect to full text, 2005. http://hdl.handle.net/2123/924.

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Thesis (Ph. D.)--University of Sydney, 2006.<br>Title from title screen (viewed 30 May 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Physics, Faculty of Science. "Centre for Ultrahigh-bandwidth Devices for Optical Systems" -- T.p. Degree awarded 2006; thesis submitted 2005. Includes bibliographical references. Also available in print form.
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19

Yu, Ronghua. "Phonon-assisted tunneling in silicon/silicon-germanium resonant interband tunnel diodes." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1190145556.

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20

Kroner, Martin. "Resonant photon-exciton interaction in semiconductor quantum dots." Diss., München Verl. Dr. Hut, 2008. http://d-nb.info/989622762/04.

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21

Molina-Contreras, J. R., C. Frausto-Reyes, C. I. Medel-Ruíz, and Ladrón de Guevara H. Pérez. "CdTe Raman Line Shape in Resonance: a Space Correlation Zone Study." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42800.

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We show that the line shape of resonant Raman spectra of CdTe can be reproduced using the spatial correlation model (SCM). Our results show that the resonant Raman spectrum for a surface with a RMS of 430 nm is characterized by the presence of two intense sharp peaks located at frequencies corresponding to LO and 2LOmodes. The resonant Raman spectrum for a surface with a RMS of 6 nm on the other hand, can be reproduced using the contribution of high frequency phonons related with the acoustic transverse harmonics. These results suggest that under resonance conditions, such acoustic transverse
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22

Rönchen, Deborah [Verfasser]. "Baryon resonances in pion- and photon-induced hadronic reactions / Deborah Rönchen." Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1051028086/34.

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23

Mahmoud, Hatem Ahmed. "Resonance Two Photon Ionization Study of Binary Clusters of Styrene with Polar Molecules." VCU Scholars Compass, 2003. http://scholarscompass.vcu.edu/etd/983.

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One-color resonance two-photo ionization (R2PI) spectra of mixed clusters of styrene molecule (S) with polar molecules [water (W), methanol (M), ethanol (E), and trifuoroethanol (T)] were measured through the S1←S0 transition of the styrene molecule. The spectra reveal a rapid increase in complexity with the number of polar molecules in the cluster, associated with van der Waal modes and isomeric forms. The spectral shifts of the cluster origins from the S1-S0 transition of the bare styrene molecule reflect the nature of the intermolecular interactions within the binary clusters. The obtained
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24

Hees, Simon Söhnke. "Single photon detection using quantum dot resonant tunnelling diodes." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613151.

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25

Peiris, Manoj. "Towards Violation of Classical Inequalities using Quantum Dot Resonance Fluorescence." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6925.

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Self-assembled semiconductor quantum dots have attracted considerable interest recently, ranging from fundamental studies of quantum optics to advanced applications in the field of quantum information science. With their atom-like properties, quantum dot based nanophotonic devices may also substantially contribute to the development of quantum computers. This work presents experimental progress towards the understanding of light-matter interactions that occur beyond well-understood monochromatic resonant light scattering processes in semico
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26

Petch, Jason Charles. "Resonant four-wave mixing in krypton." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243502.

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27

Müller, Markus [Verfasser]. "Generation of Indistinguishable and Entangled Photons from Semiconductor Quantum Dots - Exploiting Resonant and Coherent Single and Two-Photon Excitation Methods / Markus Müller." München : Verlag Dr. Hut, 2018. http://d-nb.info/1153254417/34.

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28

Ulhaq, Ata [Verfasser]. "Photon Statistics and Dephasing of the Resonance Fluorescence from Single Quantum Dots / Ata Ulhaq." München : Verlag Dr. Hut, 2012. http://d-nb.info/1024242846/34.

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29

Schunk, Gerhard [Verfasser], Gerd [Akademischer Betreuer] Leuchs, Hugues de [Gutachter] Riedmatten, and Christoph [Gutachter] Marquardt. "Tunable single photons from resonant parametric down-conversion for efficient photon-atom coupling / Gerhard Schunk ; Gutachter: Hugues de Riedmatten, Christoph Marquardt ; Betreuer: Gerd Leuchs." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2018. http://d-nb.info/1160444250/34.

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Schunk, Gerhard Rainer [Verfasser], Gerd [Akademischer Betreuer] Leuchs, Hugues de [Gutachter] Riedmatten, and Christoph [Gutachter] Marquardt. "Tunable single photons from resonant parametric down-conversion for efficient photon-atom coupling / Gerhard Schunk ; Gutachter: Hugues de Riedmatten, Christoph Marquardt ; Betreuer: Gerd Leuchs." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2018. http://d-nb.info/1160444250/34.

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31

Kasai, S., T. Katagiri, J. Takayanagi, K. Kawase, and T. Ouchi. "Reduction of phonon resonant terahertz wave absorption in photoconductive switches using epitaxial layer transfer." American Institite of Physics, 2009. http://hdl.handle.net/2237/12632.

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32

Thébaud, Simon. "Electron and phonon transport in disordered thermoelectric materials : dimensional confinement, resonant scattering and localization." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1168/document.

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Ces dernières décennies, l'urgence croissante de la crise énergétique et la prise de conscience qu'une grande partie de l'énergie utilisée dans le monde est dissipée sous forme de chaleur ont provoqué un engouement pour le développement de modules thermoélectriques performants. Ces dispositifs pourraient récupérer la chaleur provenant de procédés industriels ou d'autres sources, transformant un gradient de température en voltage grâce à l'effet Seebeck. Les matériaux thermoélectriques performants doivent posséder une faible conductivité thermique, une haute conductivité électrique et un grand
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Amponsah, Sylvester. "Optical Characterization of Nitrogen-vacancy Centers andResonance Analysis of CVD Grown Diamond MEMS Devices." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1528479091207253.

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34

Conterio, Michael John. "An electrically driven resonant tunnelling semiconductor quantum dot single photon source." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708597.

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35

Elford, Daniel P. "Band gap formation in acoustically resonant phononic crystals." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7071.

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The work presented in this thesis is concerned with the propagation of acoustic waves through phononic crystal systems and their ability to attenuate sound in the low frequency regime. The plane wave expansion method and finite element method are utilised to investigate the properties of conventional phononic crystal systems. The acoustic band structure and transmission measurements of such systems are computed and verified experimentally. Good agreement between band gap locations for the investigative methods detailed is found. The well known link between the frequency range a phononic crysta
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36

Braunstein, Matthew McKoy Vincent McKoy Vincent. "Photoionization dynamics and ion state distributions in single-photon and resonance enhanced multiphoton ionization of molecules /." Diss., Pasadena, Calif. : California Institute of Technology, 1991. http://resolver.caltech.edu/CaltechETD:etd-06182007-133055.

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37

Sjödin, Marica. "Resonant multi-photon ionisation studies of high-energy states in small molecules." Doctoral thesis, KTH, Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-409.

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<p>This thesis describes separate studies of high-energy Rydberg and ion-pair states in small molecules using resonant multi-photon ionisation spectroscopy.</p><p>* OODR/REMPI study of ungerade Rydberg states in O<sub>2</sub></p><p>The energy region between 75000 and 99900 cm<sup>-1</sup> of O<sub>2</sub> has been studied using optical-optical double resonance (OODR) with resonance enhanced multi-photon ionisation (REMPI). Three-photon excitation via single rotational levels of the b(<sup>1</sup>Σ<sup>+</sup><sub>g</sub> ) valence state was used to study <i>n</i>p (<i>n</i>=3–10) and <i>nf </i
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Sjödin, Marica. "Resonant multi-photon ionisation studies of high-energy states in small molecules /." Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-409.

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Sjödin, Marica. "Resonant multi-photon ionisation studies of high-energy states in diatomic molecules /." Stockholm, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-356.

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40

Ahlrichs, Andreas. "Triply-Resonant Cavity-Enhanced Spontaneous Parametric Down-Conversion." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20150.

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Die verlässliche Erzeugung einzelner Photonen mit wohldefinierten Eigenschaften in allen Freiheitsgraden ist entscheidend für die Entwicklung photonischer Quantentechnologien. Derzeit basieren die wichtigsten Einzelphotonenquellen auf dem Prozess der spontanen parameterischen Fluoreszenz (SPF), bei dem ein Pumpphoton in einem nichtlinearen Medium spontan in ein Paar aus Signal und Idlerphotonen zerfällt. Resonator-überhöhte SPF, also das Plazieren des nichtlinearen Mediums in einem optischen Resonator, ist ein weit verbreitetes Verfahren, um Einzelphotonenquellen mit erhöhter Helligkeit und an
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Jude, Thomas. "Strangeness photoproduction off the proton at threshold energies." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4769.

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K+Λ photoproduction provides the best possibility for a model independent extraction of the photoproduction process and contributing resonances. To do this, it is vital that cross section measurements are well understood. This thesis presents pγ K+Λ differential cross sections from the reaction threshold, to an invariant centre of mass energy of 1.87 GeV. The data was taken at MAMI-C electron microtron facility in Mainz, Germany, during July 2007 and April 2009. The 1.5 GeV MAMI-C electron beam was used to produce an energy tagged bremsstrahlung photon beam with a maximum energy of 1.4 GeV and
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Chen, Sophia Lee. "Two-Photon Direct Frequency Comb Spectroscopy of Rubidium." Oberlin College Honors Theses / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1337650567.

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43

Bergstedt, Mikael. "Theoretical investigation of the first-order hyperpolarizability in the two-photon resonant region." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10290.

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<p>Time-dependent density functional theory calculations have been carried out to determine the complex first-order hyperpolarizability in the two-photon resonance region of the molecule IDS-Cab. Calculations show that three strongly absorbing states, in the ultraviolet region, are separated to the extent that no significant interference of the imaginary parts of the tensor elements of the first-order hyper-polarizability occurs. Consequently, and in contrast to experimental findings [27], no reduced imaginary parts of the first-order hyperpolarizability in the two-photon resonant region can b
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44

Butler, Andrew Michael. "Mass-resolved resonant two-photon ionisation spectroscopy of jet-cooled Cu2 and Ag2." Thesis, University of Edinburgh, 1990. http://hdl.handle.net/1842/27635.

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Clusters of the transition metals were generated by laser vaporisation of a sample of the metal into the throat of a pulsed supersonic expansion. This allowed clusters with internal temperatures as low as 5 K to be routinely prepared. Mass-selective detection was accomplished by multi-photon ionisation of the clusters within the ion source of a time - of - flight mass spectrometer. Use of a tunable laser to carry out electronic excitation, prior to ionisation, allowed mass - resolved resonant two - photon ionisation spectra of the clusters to be recorded. Real time control of the experiment an
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45

Wehner, Justin. "Investigation of resonant-cavity-enhanced mercury cadmium telluride infrared detectors." University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0148.

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[Truncated abstract] Infrared (IR) detectors have many applications, from homeland security and defense, to medical imaging, to environmental monitoring, to astronomy, etc. Increasingly, the wave- length dependence of the IR radiation is becoming important in many applications, not just the total intensity of infrared radiation. There are many types of infrared detectors that can be broadly categorized as either photon detectors (narrow band-gap materials or quantum structures that provide the necessary energy transitions to generate free car- riers) or thermal detectors. Photon detectors gene
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Mohd, Razip Wee Farhan. "Solid-fluid interaction in a pillar based phononic crystal." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD055.

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Les cristaux phononiques (CP) sont des structures constituées de motifs élémentaires périodisés qui sont conçus et dimensionnés de manière à obtenir une propagation d’ondes acoustiques ou élastiques très différente de la propagation naturelle dans un matériau non structuré. C’est un moyen très efficace pour façonner la propagation des ondes acoustiques grâce notamment à la présence de bandes interdites liées à la périodicité des motifs élémentaires ou liées à leurs résonances intrinsèques. Ces mécanismes de contrôle de la propagation d’ondes constituent un énorme potentiel technologique dans d
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47

Valkama, M. (Marita). "Prediction of neurosensory disability in very low birth weight preterm infants:structural and functional brain imaging and hearing screening at term age and follow-up of infants to a corrected age of 18 months." Doctoral thesis, University of Oulu, 2001. http://urn.fi/urn:isbn:9514259157.

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Abstract The objectives were to study ultrasound (US), magnetic resonance imaging (MRI), single photon emission tomography (SPET) and brainstem auditory evoked potentials (BAEP) as structural and functional imaging methods for the prediction of later neuromotor outcome and to assess the reliability of auditory brainstem responses (ABR), transient evoked otoacoustic emissions (TEOAE) and free-field auditory behavioural responses (FF) for the prediction of permanent hearing loss. The series comprised 51 surviving very low birth weight preterm infants born at &lt; 34 gestational weeks with
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Pant, Lok Raj. "The Radiative Lifetime Measurement on 61Σ+g (v = 9, 10, 11, J = 31) Excited States of Molecular Sodium Using Time Resolved High Resolution Doubled Resonance Spectroscopy". Miami University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami1626966676896514.

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Hou, Ying. "Experimental and theoretical study of quantum dot resonant tunneling diodes for single photon detection." Licentiate thesis, KTH, School of Biotechnology (BIO), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9342.

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<p>Single photon detection has a broad application in the medical, telecommunication, as well as in infrared imaging fields. In this thesis I present my work in studying quantum dot (QD) resonant tunneling diodes (RTD) for single photon detection. The device was processed in the form of a free-standing small-area air bridge. A detailed series of experimental and theoretical characterizations have been performed to understand the electrical properties of the RTDs (without embedding any QDs) and QD-embedded RTDs (QDRTDs). It has been shown that external series and parallel resistances shift the
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Ash, Benjamin James. "Locally resonant metamaterial for surface acoustic waves." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34380.

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The control of surface acoustic waves (SAWs) using arrays of annular holes was investigated both experimentally and through numerical modelling. Periodic elastic composites, phononic crystals (PnCs), were designed using these annular holes as constituent elements. Local resonances associated with the annular hole structure were found to induce phonon bandgaps of a highly frequency tailorable nature, at frequencies where radiation of acoustic energy into the bulk of the substrate medium is avoided. These bandgaps are numerically demonstrated to exhibit order-of-magnitude improved extinction rat
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