Дисертації з теми "Slow photon"
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Faggiani, Rémi. "Resonant nanophotonics : structural slow light and slow plasmons." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0396/document.
Повний текст джерелаEnhancing light-matter interactions at micro and nanoscales is one of the spearheads of nanophotonics. Indeed, the control of the field distribution due to the resonant interaction of nanostructures with electromagnetic waves has prompted the development of numerous optical components for many applications in telecommunication, spectroscopy or sensing. A promising approach lies in the control of light speed in nanostructures. Light slowdown, obtained by wave interferences in periodic structures or subwavelength confinement in plasmonic waveguides, is associated to pulse compressions and large field enhancements,which are envisioned as key processes for the miniaturization of optical devices and the enhancement of light-matter interactions.The thesis studies both fundamental aspects and possible applications related to slow light in photonic and plasmonic nanostructures. In particular, we study the impact of periodic system sizes on the group velocity reduction and propose a novelfamily of resonators that implement slow light on very small spatial scales. We then investigate the role of fabrication disorder in slow periodic waveguides on light localization and demonstrate how modal properties influence the confinement of localized modes. Also we propose a new hollow-core photonic crystal waveguide that provides efficient and remote couplings between the waveguide and atoms thatare trapped away from it. Finally we demonstrate the important role played by slow plasmons on the emission of quantum emitters placed in nanogap plasmonic antennas and explain how large radiation efficiency can be achieved by overcoming quenching in the metal. Additionally, one part of the thesis is devoted to thederivation of a novel modal method to accurately describe the dynamics of plasmonic resonators under short pulse illumination
Thurtell, Tyler. "Slow and Stopped Light with Many Atoms, the Anisotropic Rabi Model and Photon Counting Experiment on a Dissipative Optical Lattice." Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami1533592687000267.
Повний текст джерелаEscalante, Fernández José María. "Theoretical study of light and sound interaction in phoxonic crystal structures." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/33754.
Повний текст джерелаEscalante Fernández, JM. (2013). Theoretical study of light and sound interaction in phoxonic crystal structures [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/33754
TESIS
Chibani, Haytham [Verfasser], Gerhard [Akademischer Betreuer] Rempe, and Rudolf [Akademischer Betreuer] Gross. "Photon Blockade with Memory and Slow Light using a Single Atom in an Optical Cavity / Haytham Chibani. Betreuer: Gerhard Rempe. Gutachter: Rudolf Gross ; Gerhard Rempe." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1099594634/34.
Повний текст джерелаChibani, Haytham Verfasser], Gerhard [Akademischer Betreuer] Rempe, and Rudolf [Akademischer Betreuer] [Gross. "Photon Blockade with Memory and Slow Light using a Single Atom in an Optical Cavity / Haytham Chibani. Betreuer: Gerhard Rempe. Gutachter: Rudolf Gross ; Gerhard Rempe." München : Universitätsbibliothek der TU München, 2016. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20160428-1293639-1-2.
Повний текст джерелаZang, Xiaorun. "Lumière lente dans les guides à cristaux photoniques pour l'interaction renforcée avec la matière." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0172/document.
Повний текст джерелаIn this thesis, we firstly investigated the striking influence of random disorder on light transport near band edges in one dimensional photonic crystal wave guides, i.e. light localization. Near-field measurements, statistical simulations and theoretical model revealed the existence of a lower bound for the spatial extent of localized modes. We also showed that the disorder level and the spatial extent of individual localized mode is linked by the photon effective mass rather than the generally considered group velocity. Secondly, hybrid cold atoms and photonic crystal wave guides system have been recognized as a promising paradigm for engineering large light-matter interaction at single atoms and photons level. In this thesis, we studied the basic physics, i.e. light transport in periodic nanophotonic wave guides coupled to two-level atoms. Our developed general semi-analytical expression can quickly characterize the coupling between cold atoms and guided photons. Aim to overcome the significant technical challenges existed for developing hybrid atom-photonic systems, we designed a nanophotonic waveguide, which supports a slow guided Bloch mode with large evanescent tail in free space for cold atoms trapping (release the limitation imposed by Casmir Polder force and technical challenge of nanoscale manipulation of cold atoms). To match precisely the slow light region of the guided mode to the atomic transition line, we carefully engineered the photonic band and the dispersion curve (i.e.flatness) of the guided mode so that the interaction strength is robust against unpredictable fabrication imperfection
Lauprêtre, Thomas. "Processus cohérents et applications des phénomènes de lumière lente et rapide dans l'hélium métastable à température ambiante." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00772326.
Повний текст джерелаPetrov, Alexander. "Slow light photonic crystal line-defect waveguides." Göttingen Cuvillier, 2007. http://d-nb.info/989861244/04.
Повний текст джерелаSchulz, Sebastian Andreas. "Propagation loss in slow light photonic crystal waveguides." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/2837.
Повний текст джерелаMicó, Reche Mª del Mar. "Photo-Fenton and Slow Sand Filtration coupling for hydroponics water reuse." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/128571.
Повний текст джерелаEsta tesis se enmarca en la colaboración entre el Departamento de Ingeniería Química de la Universidad de Barcelona y el Departamento de I+D de Acciona Agua S.A.U, en el marco del Proyecto CENIT- MEDIODIA (2007-2010). Esta iniciativa la componen un consorcio de empresas un consorcio de empresas y centros de investigación que unieron esfuerzos de innovación en el desarrollo de un nuevo concepto de Invernaderos Hidropónicos Avanzados. La colaboración entre la Universidad de Barcelona y Acciona Agua se centró en la optimización de los recursos hídricos de dichos invernaderos. Así se evaluó la funcionalidad de un tratamiento combinado que integrara un Proceso de Oxidación Avanzada (reacción foto-Fenton), y un reactor biológico (columna de arena de filtración lenta), aplicados a la corriente de desecho de un sistema de recirculación de lixiviados provenientes del nombrado invernadero avanzado. Las particularidades de dicho sistema de reciclado harían que el sistema combinado tuviese que trabajar con efluentes con alto contenido en pesticidas (metomilo, imidacloprid y fosetyl-Al, fueron escogidos para simular los lixiviados de invernadero) y conductividades entre 11 y 50 mS•cm-1. De este modo el principal objetivo del proceso integrado sería el de conseguir la máxima eliminación de los compuestos xenobióticos y de la carga orgánica que los acompañe en el efluente tratado. Así pues, la experimentación se llevó a cabo frente a tres aspectos relacionados con el sistema combinado: estudio de la reacción foto-Fenton, ensayos con biorreactores, y empleo de herramientas de biología molecular (MBT, en sus siglas en inglés) aplicadas a la caracterización de la biomasa desarrollada en los biorreactores ensayados. Según los resultados obtenidos, se llegó a la conclusión de que la combinación de la reacción foto-Fenton y la columna de filtración lenta podría ser una alternativa de tratamiento eficaz para la aplicación de las estrategias de reciclaje de los lixiviados hidroponía presentadas en Proyecto CENIT-MEDIODIA. Además, MBT se revelaron como poderosas herramientas para caracterizar la población microbiana de distintos biorreactores y las funciones que desempeñan.
Grinberg, Patricio. "Slow light in two dimensional semi-conductor photonic crystals." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00830962.
Повний текст джерелаAskari, Murtaza. "High efficiency devices based on slow light in photonic crystals." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39558.
Повний текст джерелаPovinelli, Michelle Lynn 1975. "Characteristics of defect modes, slow light, and disorder in photonic crystals." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/29449.
Повний текст джерелаIncludes bibliographical references (p. 97-122).
Chapter 1 introduces the subject of photonic crystals and reviews the basic physical principles underlying the formation of a band gap and the creation of localized defect modes. Proposed applications, fabrication techniques, and numerical simulation methods are surveyed. Chapter 2 demonstrates the construction of 2D-like defect modes in a 3D photonic crystal with a complete gap. The modes are similar to those in 2D photonic crystals in terms of polarization, field profile, and projected band structures. The results should facilitate the implementation of 2D photonic-crystal devices in realistic 3D systems. Chapter 3 explores the possibility of using photonic-crystal defect modes to design magnetic metamaterials: structures that exhibit magnetic properties despite the non- magnetic character of their constituents. A synthetic magnetic moment is provided by a point-defect mode studied in Chapter 2. Quantitative analysis of the far-field radiation pattern proves that the mode has a primarily magnetic character: over 98% of the emitted power goes into magnetic multipole radiation. Chapter 4 calculates the radiation pressure on the surface of a waveguide formed by ornnidirectionally reflecting mirrors. In the absence of losses, the pressure goes to infinity as the distance between the mirrors is reduced to the cutoff separation of the waveguide mode. The divergence results from the reduction of the modal group velocity to zero, which causes slow-light magnification of the field intensity at constant power input.
(cont.) Chapter 5 analyzes slow-light, band-edge waveguides for compact, integrated, tun- able optical time delays. Slow group velocities at the photonic band edge give rise to large changes in time delay for small changes in refractive index, shrinking device size. Figures of merit are defined for tuning sensitivity and signal dispersion. Exact calculations for a realistic, three-dimensional grating structure are shown to be well predicted by a simple quadratic-band model, simplifying device design. Chapter 6 derives a general, coupled-mode theory for disorder-induced scattering in strongly periodic systems. The analytical results allow the comparison of photonic- crystal waveguides to similar index-guided waveguides. In the realistic limit of weak disorder, reflections are identical while transmission is higher for the photonic-crystal waveguide. The general results, verified by direct numerical simulations in an example system, suggest a new mechanism for the design of low-loss waveguides.
by Michelle Lynn Povinelli.
Ph.D.
Brosi, Jan-Michael. "Slow-light photonic crystal devices for high-speed optical signal processing." Karlsruhe : Universitätsverlag, 2009. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000009905.
Повний текст джерелаBrosi, Jan-Michael. "Slow light photonic crystal devices for high speed optical signal processing." Karlsruhe Univ.-Verl. Karlsruhe, 2008. http://d-nb.info/992585090/04.
Повний текст джерелаVo, Thanh Phong. "Optical near-field characterization of Slow-Bloch Mode based photonic crystal devices." Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00758323.
Повний текст джерелаRey, Isabella H. "Active slow light in silicon photonic crystals : tunable delay and Raman gain." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3356.
Повний текст джерелаLloret, Soler Juan Antonio. "Slow Light Effects in Photonic Integrated Circuits with Application to Microwave Photonics." Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/16472.
Повний текст джерелаLloret Soler, JA. (2012). Slow Light Effects in Photonic Integrated Circuits with Application to Microwave Photonics [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/16472
Palancia
Hao, Ran. "Wide-band low-dispersion low-losses slow light in photonic crystal waveguides." Paris 11, 2010. http://www.theses.fr/2010PA112351.
Повний текст джерелаThis Ph. D study brings contributions of solving present problems for slow light in photonic crystal waveguides, aiming to obtain wide-band, low-dispersion, and low losses slow light. Novel kinds of photonic crystal waveguides are proposed having large bandwidth, low group velocity dispersion and allowing a flexible control of slow light properties with reasonable requirements to clean room fabrication. An overall approach to improve the delay-bandwidth product of present slow light devices is proposed. By using this approach, the normalized delay-bandwidth product of previous waveguides has been improved by a factor of 15 if compared with regular photonic crystal waveguides with a group index maintained at the high value of 90. The fabrication induced losses have also been studied. We modeled four kinds of structure disorders in real fabrication. The obtained results quantify how much the region close to the line defect center has a dominant influence on the losses. Finally, all design results have been used for the fabrication of silicon-on-insulator samples prepared for the demonstration of the foreseen slow light effects
Sancho, Durá Juan. "Photonic-assisted RF Signal Processing based on Slow and Fast Light Technological Platforms." Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/16471.
Повний текст джерелаSancho Durá, J. (2012). Photonic-assisted RF Signal Processing based on Slow and Fast Light Technological Platforms [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/16471
Palancia
Yu, Wing Wa. "Routing and time-slot assignment in photonic circuit switching networks /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202002%20YUW.
Повний текст джерелаIncludes bibliographical references (leaves 68-70). Also available in electronic version. Access restricted to campus users.
Hoang, Thi Hong Cam. "Planar slot photonic crystal cavities for on-chip hybrid integration." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS063/document.
Повний текст джерелаThis Ph.D. work is a contribution to the modeling and the experimental study of slot photonic crystal cavities for hybrid on-silicon integration. Among the design works, we first have used plane the wave expansion and finite-difference time-domain methods to design a series of mechanically robust (non-free membrane) SOI slot photonic crystal heterostructure cavities with resonance wavelengths in the telecommunication range, i.e. from 1.3 µm – 1.6 µm, with Q-factors of around several tens of thousands and mode volumes around 0.03(lambda/n)^3 after being infiltrated by cladding materials with typical index values around 1.5. We have then analytically and numerically studied the coupling between a slot photonic crystal cavity and a slot photonic crystal waveguide by using the coupled mode theory and FDTD simulation. Then we confirmed the ability to excite the cavity slot modes from a waveguide by using FDTD simulation. Finally, as a preliminary step towards the use of several coupled slotted cavities for future hybrid integration schemes, we have numerically and semi-analytically investigated photonic molecules made of two coupled slot photonic crystal cavities providing two different supermodes (bonding and antibonding ones) with controllable wavelength splitting. We successfully employed the tight-binding (TB) approach, which relies on the overlap of the two tightly confined cavity electric fields, to predict the supermodes frequencies and spatial distributions in several coupled slot photonic crystal cavity configurations.This exploratory work was supplemented by an experimental part, which focused on the investigation of a family of slot photonic crystal heterostructure cavities. The fabricated silicon on insulator hollow core cavities showed quality factors of several tens of thousands, i.e. from 18,000 to 31,000 and mode volume V of ~0.03(λ/n)3 after being infiltrated with liquids of ~1.46 refractive index, yielding Q/V ratio larger than 600,000, and reaching 1,000,000 in the best case (at λ ≈ 1.3 μm).This preliminary experimental stage gave rise to two types of additional developments.Firstly, the properties of the studied slot photonic crystal cavities have been investigated for index sensing applications by using different liquids with refractive index values ranging from 1.345 to 1.545. The considered photonic crystal resonators have demonstrated quality factors of several tens of thousands with sensitivities of ~235 nm/RIU and index sensing FOMs around 3,700, i.e. at the state of the art considering hollow core silicon integrated resonators.Secondly, in the view of the integration of active materials on silicon, the potential of these hollow core nanoresonators has been considered to enhance the photo-luminescence (PL) of semiconductor single-walled carbon nanotubes (SWNTs) integrated in thin films deposited on top of silicon. We have brought the first experimental demonstration of SWNTs PL collection (around lambda=1.28 µm) under vertical pumping at short wavelength (lambda=740 nm) from a slotted resonator into millimeter long integrated silicon waveguides, providing a first proof-of-concept step towards nanotube/Si-PhC integration as an active photonic platform. The reported works demonstrate the feasibility of integrating telecommunication wavelength nanotube emitters in silicon photonics as well as emphasize the role of slot photonic crystal cavities for on-chip hybrid integration
Wheeler, Natalie. "Molecular and atomic confinement in large core photonic microcells for slow light and laser metrology applications." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538142.
Повний текст джерелаJohnston, Wesley James. "Nonlinear optics in Bragg-spaced quantum wells." Diss., University of Iowa, 2010. https://ir.uiowa.edu/etd/826.
Повний текст джерелаSpurny, Marcel. "Photonic crystal waveguides in chalcogenide glasses." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2111.
Повний текст джерелаYuen, Siu Yu. "Routing and time-slot assignment algorithms and connection management in photonic circuit switched networks /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20YUEN.
Повний текст джерелаScullion, Mark Gerard. "Slotted photonic crystal biosensors." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3405.
Повний текст джерелаHosseini, Seyedreza, and Kambiz Jamshidi. "Modulation efficiency enhancement of an optical phase modulator using one dimensional photonic crystal structures." SPIE, 2015. https://tud.qucosa.de/id/qucosa%3A35320.
Повний текст джерелаBerrier, Audrey. "InP-based photonic crystals : Processing, Material properties and Dispersion effects." Doctoral thesis, KTH, Mikroelektronik och tillämpad fysik, MAP, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4734.
Повний текст джерелаQC 20100712
Zanzi, Andrea. "Passive and active silicon photonics devices at TLC telecommunication wavelengths for on-chip optical interconnects." Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/149377.
Повний текст джерела[ES] Las tecnologías ópticas son el eje vertebrador de los sistemas de comunicación mod- ernos que proporcionan acceso de alta velocidad a la Internet, interconexiones efi- cientes entre centros de datos y dentro de ellos. Además, se están expandiendo hacia campos de investigación crecientes y nuevos mercados como son las aplicaciones de comunicaciones por satélite, los LIDAR (Laser Imaging Detection and Ranging), la computación neuromórfica y los circuitos fotónicos programables, por nombrar algunos. La fotónica de silicio está considerada y aceptada ampliamente como una de las tecnologías clave para que dichas aplicaciones puedan desarrollarse. Como resultado, hay una fuerte necesidad de estructuras fotónicas básicas integradas que sean innovadoras, que soporten altas velocidades de transmisión y que sean más eficientes en términos de consumo de potencia, a fin de aumentar la capacidad de los circuitos integrados fotónicos de silicio. El trabajo desarrollado y presentado en esta tesis se centra en el diseño y la car- acterización de dispositivos avanzados pasivos y activos, para circuitos fotónicos integrados. La tesis consta de tres capítulos principales, así como de sendas sec- ciones de motivación y conclusiones que exponen los fundamentos y los logros de este trabajo. El capítulo uno describe el diseño y la caracterización de un modulador electro-óptico Mach-Zehnder incorporado en una unión pn vertical altamente eficien- ciente que explota el efecto de dispersión de plasma en banda O. El capítulo dos está dedicado al diseño y caracterización de una nueva geometría de dispositivo de interferencia multimodo asimétrico y su aplicación en un modulador Mach-Zehnder. El capítulo tres está dedicado al diseño y caracterización de innovadores cristales fotónicos unidimensionales para aplicaciones de modulación con luz lenta. Se pre- senta un amplio análisis de los principales retos derivados del uso de la misma.
[CA] Les tecnologies òptiques són l'eix vertebrador d'aquells sistemes de comunicació moderns que proporcionen accés d'alta velocitat a la Internet, així com intercon- nexions eficients inter i entre centres de dades. A més a més, s'estan expandint cap a camps d'investigació creixents i nous mercats com són les aplicacions de co- municacions per satèl·lit, els LIDAR (Laser Imaging Detection and Ranging), la computació neuromòrfica i els circuits fotònics programables, entre d'altres. La fotònica de silici és considerada i acceptada àmpliament com una de les tecnologies clau i necessàries perquè aquestes aplicacions puguen desenvolupar-se. Per aquest motiu, es fa necessària l'existència d'estructures fotòniques bàsiques integrades que siguen innovadores, que suporten altes velocitats de transmissió i que siguen més eficients en termes de consum de potència, a fi d'augmentar la capacitat dels cir- cuits integrats fotònics de silici. El treball desenvolupat i presentat en aquesta tesi se centra en el disseny i la caracterització de dispositius avançats passius i actius, per a circuits fotònics integrats. La tesi consta de tres capítols principals, així com d'una secció de motivació i una altra de conclusions que exposen els fonaments i els assoliments d'aquest treball. El capítol u descriu el disseny i la caracterització d'un modulador electro-òptic Mach-Zehnder incorporat en una unió pn vertical d'alta efi- ciència que explota l'efecte de dispersió de plasma en la banda O. El capítol dos està dedicat al disseny i caracterització d'una nova geometria de dispositiu d'interferència multimode asimètric així com a la seua aplicació en un modulador Mach-Zehnder. El capítol tres està dedicat al disseny i caracterització d'innovadors cristalls fotònics unidimensionals per a aplicacions de modulació amb llum lenta. S'inclou també una anàlisi detallada dels principals reptes derivats de l'ús d'aquest tipus de llum.
I want to thank you the Generelitat Valenciana and the European Project L3MATRIX for the funding, without them my doctorate would not taken place.
Zanzi, A. (2020). Passive and active silicon photonics devices at TLC telecommunication wavelengths for on-chip optical interconnects [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/149377
TESIS
Rosa, Escutia Álvaro. "High-efficient electrodes for novel optoelectronic devices in silicon photonics." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/110364.
Повний текст джерелаSilicon photonics is nowadays the most promising technology to replace electrical inter- and intra-connections of the chips, increasing the performance in this way. The main advantages of silicon photonics technology lie on its low cost and its compatibility with the fabrications processes of microelectronics industry developed during years which allows the mass production of silicon photonics chips as well hybrid electronic and photonic devices in the same chip. Optoelectronics switches and modulators are key building blocks in photonic devices for tele/datacom applications. Such switches and modulators are devices which provides routing functionalities and the transmission of high speed data respectively. The work of this thesis delves with the design and optimization of silicon based switches and modulators spotlighting the electrical elements. Additionally, the work of this theses deals with the introduction of new silicon-compatible materials as vanadium dioxide and barium titanate, with the aim of demonstrating its functionalities and develop high-performance optoelectronic devices.
La fotònica de silici és actualment la tecnologia millor posicionada per a reemplaçar les connexions electròniques tant dins del propis xips, com entre ells mateixos, amb la finalitat de millorar el seu rendiment. Els principals avantatges de la tecnologia fotònica de silici resideixen en el seu baix cost i en la seua compatibilitat amb les actuals tècniques de fabricació desenvolupades per la indústria microelectrònica. Aquesta compatibilitat permetria fabricar tant xips òptics com a xips híbrids que incloguen components òptics i electrònics. Els moduladors i els commutadors optoelectrònics resulten dispositius fonamentals en aplicacions de telecomunicacions. Les principals funcions dels commutadors i moduladors optoelectrònics són l'encaminament i la transmissió de dades d'alta velocitat. Aquesta tesi aborda el disseny i l'optimització de la part elèctrica i òptica (en menor mesura) amb la finalitat d'optimitzar el rendiment de tals dispositius des del punt de vista optoelectrònic. A més, també es tractarà la introducció de nous materials compatibles amb el silici i els seus processos de fabricació, com el diòxid de vanadi o el titanato de bari amb la finalitat de demostrar les seues propietats i aplicar-les als dispositius optoelectrònics amb la finalitat de millorar el seu rendiment.
Rosa Escutia, Á. (2018). High-efficient electrodes for novel optoelectronic devices in silicon photonics [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/110364
TESIS
Torrijos, Morán Luis. "Photonic Applications Based on Bimodal Interferometry in Periodic Integrated Waveguides." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/172163.
Повний текст джерела[ES] La fotónica de silicio es una tecnología emergente clave en redes de comunicación e interconexiones de centros de datos de nueva generación, entre otros. Su éxito se basa en la utilización de plataformas compatibles con la tecnología CMOS para la integración de circuitos ópticos en dispositivos pequeños para una producción a gran escala a bajo coste. Dentro de este campo, los interferómetros integrados juegan un papel crucial en el desarrollo de diversas aplicaciones fotónicas en un chip como sensores biológicos, moduladores electro-ópticos, conmutadores totalmente ópticos, circuitos programables o sistemas LiDAR, entre otros. Sin embargo, es bien sabido que la interferometría óptica suele requerir caminos de interacción muy largos, lo que dificulta su integración en espacios muy compactos. Para mitigar algunas de estas limitaciones de tamaño, surgieron varios enfoques, incluyendo materiales sofisticados o estructuras más complejas, que, en principio, redujeron el área de diseño pero a expensas de aumentar los pasos del proceso de fabricación y el coste. Esta tesis tiene como objetivo proporcionar soluciones generales al problema de tamaño típico de los interferómetros ópticos integrados, con el fin de permitir la integración densa de dispositivos basados en silicio. Para ello, aunamos los beneficios tanto de las guías de onda bimodales como de las estructuras periódicas, en términos de la mejora del rendimiento y la posibilidad para diseñar interferómetros monocanal en áreas muy reducidas. Más específicamente, investigamos los efectos dispersivos que aparecen en estructuras menores a la longitud de onda y en las de cristal fotónico, para su implementación en diferentes configuraciones interferométricas bimodales. Además, demostramos varias aplicaciones potenciales como sensores, moduladores y conmutadores en tamaños ultra compactos de unas pocas micras cuadradas. En general, esta tesis propone un nuevo concepto de interferómetro integrado que aborda los requisitos de tamaño de la fotónica actual y abre nuevas vías para futuros dispositivos basados en funcionamiento bimodal.
[CA] La fotònica de silici és una tecnologia emergent clau en xarxes de comunicació i interconnexions de centres de dades de nova generació, entre altres. El seu èxit es basa en la utilització de plataformes compatibles amb la tecnologia CMOS per a la integració de circuits òptics en dispositius diminuts per a una producció a gran escala a baix cost. Dins d'aquest camp, els interferòmetres integrats juguen un paper crucial en el desenvolupament de diverses aplicacions fotòniques en un xip com a sensors biològics, moduladors electro-òptics, commutadors totalment òptics, circuits programables o sistemes LiDAR, entre altres. No obstant això, és ben sabut que la interferometría òptica sol requerir camins d'interacció molt llargs, la qual cosa dificulta la seua integració en espais molt compactes. Per a mitigar algunes d'aquestes limitacions de grandària, van sorgir diversos enfocaments, incloent materials sofisticats o estructures més complexes, que, en principi, van reduir l'àrea de disseny però a costa d'augmentar els processos de fabricació i el cost. Aquesta tesi té com a objectiu proporcionar solucions generals al problema de grandària típica dels interferòmetres òptics integrats, amb la finalitat de permetre la integració densa de dispositius basats en silici. Per a això, combinem els beneficis tant de les guies d'ones bimodals com de les estructures periòdiques, en termes de funcionament d'alt rendiment per a dissenyar interferòmetres monocanal compactes en àrees molt reduïdes. Més específicament, investiguem els efectes dispersius que apareixen en estructures menors a la longitud d'ona i en les de cristall fotònic, per a la seua implementació en diferents configuracions interferomètriques bimodals. A més, vam demostrar diverses aplicacions potencials com a sensors, moduladors i commutadors en grandàries ultres compactes d'unes poques micres cuadrades. En general, aquesta tesi proposa un nou concepte d'interferòmetre integrat que aborda els requisits de grandària de la fotònica actual i obri noves vies per a futurs dispositius basats en funcionament bimodal.
[EN] Silicon photonics is a key emerging technology in next-generation communication networks and data centers interconnects, among others. Its success relies on the ability of using CMOS-compatible platforms for the integration of optical circuits into small devices for a large-scale production at low-cost. Within this field, integrated interferometers play a crucial role in the development of several on-chip photonic applications such as biological sensors, electro-optic modulators, all-optical switches, programmable circuits or LiDAR systems, among others. However, it is well known that optical interferometry usually requires very long interaction paths, which hinders its integration in highly compact footprints. To mitigate some of these size limitations, several approaches emerged including sophisticated materials or more complex structures, which, in principle, reduced the design area but at the expense of increasing fabrication process steps and cost. This thesis aims at providing general solutions to the long-standing size problem typical of optical integrated interferometers, in order to enable the densely integration of silicon-based devices. To this end, we combine the benefits from both bimodal waveguides and periodic structures, in terms of high-performance operation and compactness to design single-channel interferometers in very reduced areas. More specifically, we investigate the dispersive effects that arise from subwavelength grating and photonic crystal structures for their implementation in different bimodal interferometric configurations. Furthermore, we demonstrate various potential applications such as sensors, modulators and switches in ultra-compact footprints of a few square microns. In general, this thesis proposes a new concept of integrated interferometer that addresses the size requirements of current photonics and open up new avenues for future bimodal-operation-based devices.
Financial support is also gratefully acknowledged through postdoctoral FPI grants from Universitat Politècnica de València (PAID-01-18). European Commission through the Horizon 2020 Programme (PHC-634013 PHOCNOSIS project). The authors acknowledge funding from the Generalitat Valenciana through the AVANTI/2019/123, ACIF/2019/009 and PPC/2020/037 grants and from the European Union through the operational program of the European Regional Development Fund (FEDER) of the Valencia Regional Government 2014–2020.
Torrijos Morán, L. (2021). Photonic Applications Based on Bimodal Interferometry in Periodic Integrated Waveguides [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/172163
TESIS
Compendio
Lenglé, Kévin. "Traitement tout optique du signal à base de composants à cristaux photoniques en matériaux semiconducteurs III-V." Thesis, Rennes 1, 2013. http://www.theses.fr/2013REN1S104/document.
Повний текст джерелаThis thesis is devoted to the experimental study of optical processing functions, of wavelength multiplexed (WDM) or time multiplexed (OTDM) signals, based on III-V semiconductors photonic crystals (PhC) devices produced in the European project Copernicus. The unique dispersive properties that is possible to obtain in such a structure were studied through nonlinear effects enhanced in slow light regime. Thus, a study of four-wave mixing was performed with high bit rate wavelength conversion and time demultiplexing applications. Moreover, second harmonic generation has been demonstrated with record efficiency for such a structure, and applied to 42.5 Gbit/s telecom signals monitoring. PhC nanocavities were used as wavelength drop filter to demonstrate 100 Gbit/s WDM signal demultiplexing. Thereafter, we worked on hybrid photonic platform. The heterogeneous integration of III-V PhC nanocavity on silicon waveguide allowed us to perform very fast optical switching, applied to wavelength conversion up to 20 Gbit/s and power limiting function at 10 Gbit/s. All of these results are very promising for future photonic integration with micro-electronics and CMOS technology. Through this work, we show that PhC, owing to their confinement and slow light properties, are structures particularly interesting to perform optical processing functions
Caër, Charles. "Cristaux photoniques à fente : vers une photonique silicium hybride à exaltation localisée du champ électromagnétique." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00954411.
Повний текст джерелаAndrade, Humberto Dion?sio de. "Desenvolvimento de um ressoador retangular de fenda com m?ltiplas camadas de substrato e com utiliza??o de material PBG para sistema de comunica??o sem fio." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15223.
Повний текст джерелаCoordena??o de Aperfei?oamento de Pessoal de N?vel Superior
In the globalized world modern telecommunications have assumed key role within the company, causing a large increase in demand for the wireless technology of communication, which has been happening in recent years have greatly increased the number of applications using this technology. Due to this demand, new materials are developed to enable new control mechanisms and propagation of electromagnetic waves. The research to develop new technologies for wireless communication presents a multidisciplinary study that covers from the new geometries for passive antennas, active up to the development of materials for devices that improve the performance at the frequency range of operation. Recently, planar antennas have attracted interest due to their characteristics and advantages when compared with other types of antennas. In the area of mobile communications the need for antennas of this type has become increasingly used, due to intensive development, which needs to operate in multifrequency antennas and broadband. The microstrip antennas have narrow bandwidth due to the dielectric losses generated by irradiation. Another limitation is the degradation of the radiation pattern due to the generation of surface waves in the substrate. Some techniques have been developed to minimize this limitation of bandwidth, such as the study of type materials PBG - Photonic Band Gap, to form the dielectric material. This work has as main objective the development project of a slot resonator with multiple layers and use the type PBG substrate, which carried out the optimization from the numerical analysis and then designed the device initially proposed for the band electromagnetic spectrum between 3-9 GHz, which basically includes the band S to X. Was used as the dielectric material RT/Duroid 5870 and RT/Duroid 6010.LM where both are laminated ceramic-filled PTFE dielectric constants 2.33 and 10.2, respectively. Through an experimental investigation was conducted an analysis of the simulated versus measured by observing the behavior of the radiation characteristics from the height variation of the dielectric multilayer substrates. We also used the LTT method resonators structures rectangular slot with multiple layers of material photonic PBG in order to obtain the resonance frequency and the entire theory involving the electromagnetic parameters of the structure under consideration. xviii The analysis developed in this work was performed using the method LTT - Transverse Transmission Line, in the field of Fourier transform that uses a component propagating in the y direction (transverse to the real direction of propagation z), thus treating the general equations of the fields electric and magnetic and function. The PBG theory is applied to obtain the relative permittivity of the polarizations for the sep photonic composite substrates material. The results are obtained with the commercial software Ansoft HFSS, used for accurate analysis of the electromagnetic behavior of the planar device under study through the Finite Element Method (FEM). Numerical computational results are presented in graphical form in two and three dimensions, playing in the parameters of return loss, frequency of radiation and radiation diagram, radiation efficiency and surface current for the device under study, and have as substrates, photonic materials and had been simulated in an appropriate computational tool. With respect to the planar device design study are presented in the simulated and measured results that show good agreement with measurements made. These results are mainly in the identification of resonance modes and determining the characteristics of the designed device, such as resonant frequency, return loss and radiation pattern
No mundo globalizado moderno, as telecomunica??es assumiram um papel fundamental dentro das sociedades, provocando um grande aumento da demanda por tecnologia de comunica??o sem fio, isto vem acontecendo nos ?ltimos anos e tem aumentado bastante o n?mero de aplica??es que utilizam esta tecnologia. Em decorr?ncia dessa demanda, novos materiais s?o desenvolvidos no sentido de possibilitar novos mecanismos de controle e propaga??o de ondas eletromagn?ticas. A pesquisa para o desenvolvimento de novas tecnologias para comunica??o sem fios apresenta um car?ter multidisciplinar que abrange desde o estudo de novas geometrias para antenas passivas e ativas at? o de desenvolvimento de materiais para dispositivos que melhorem o desempenho naquela faixa de frequ?ncia de opera??o. Recentemente as antenas planares tem despertado interesses devido as suas caracter?sticas e vantagens que oferecem quando comparadas com os demais tipos de antenas. Na ?rea de comunica??es m?veis a necessidade de antenas desse tipo tem se tornado cada vez maior, devido ao seu intenso desenvolvimento, que necessita de antenas que operem em multifrequ?ncia e em banda larga. As antenas de microfita apresentam largura de banda estreita devido ?s perdas no diel?trico geradas pela irradia??o. Outra limita??o ? a degrada??o do diagrama de irradia??o devido ? gera??o de ondas de superf?cie no substrato. Algumas t?cnicas est?o sendo desenvolvidas para minimizar esta limita??o de banda, como ? o caso do estudo de materiais do tipo PBG Photonic Band Gap, para compor o material diel?trico. Este trabalho tem como objetivo principal o desenvolvimento do projeto de um ressoador de fenda com m?ltiplas camadas e com a utiliza??o de substrato do tipo PBG, onde foi realizada a otimiza??o a partir da analise num?rica e em seguida, projetado o dispositivo proposto inicialmente para a faixa do espectro eletromagn?tico compreendida entre 3-9 GHz, que inclui basicamente a banda S at? X. Foi utilizado como material diel?trico o RT/Duroid 5870 e RT/Duroid 6010.2LM onde ambos s?o laminados cer?micos PTFE com constantes diel?tricas de 2.33 e 10.2, respectivamente. Atrav?s de uma investiga??o experimental foi realizada uma an?lise dos resultados simulados versus medidos observando o comportamento das xvi caracter?sticas de radia??o a partir da varia??o da altura das multicamadas de subtrato diel?trico. Foi utilizado tamb?m o m?todo LTT ?s estruturas ressoadoras retangulares de fenda com m?ltiplas camadas, para a obten??o da freq??ncia de resson?ncia bem como toda a teoria que envolva os par?metros eletromagn?ticos da estrutura em estudo. As an?lises desenvolvidas neste trabalho foram realizadas com utiliza??o do m?todo LTT Linha de Transmiss?o Transversa, no dom?nio da Transformada de Fourier que utiliza uma componente de propaga??o na dire??o y (transversa ? dire??o real de propaga??o z), tratando assim as equa??es gerais dos campos el?tricos e magn?ticos em fun??o de yE e yH . A teoria PBG ser? aplicada para a obten??o da permissividade relativa para as polariza??es s e p dos substratos compostos de material fot?nico. Os resultados s?o obtidos com o software comercial Ansoft HFSS, usado para a an?lise precisa do comportamento eletromagn?tico do dispositivo planar em estudo, por meio do M?todo dos Elementos Finitos (FEM). Resultados num?rico-computacionais s?o apresentados em forma de gr?fico em duas e tr?s dimens?es, para aos par?metros de perda de retorno, frequ?ncia de radia??o, e diagrama de radia??o, efici?ncia de radia??o e densidade superficial de corrente para o dispositivo em estudo, e que tem como substratos, materiais fot?nicos e que fora simulado em uma ferramenta computacional apropriada. . No que diz respeito ao projeto do dispositivo planar em estudo s?o apresentados os resultados medidos e os simulados que apresentam boa concord?ncia com as medi??es efetuadas. Estes resultados consistem principalmente na identifica??o dos modos de resson?ncia e na determina??o das caracter?sticas do dispositivo projetado, como freq??ncia de resson?ncia, perda de retorno e diagrama de radia??o
Sciancalepore, Corrado. "Intégration hétérogène III-V sur silicium de microlasers à émission par la surface à base de cristaux photoniques." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00915280.
Повний текст джерелаLim, Siew Yee. "Advanced Photonic Crystals for Efficient Light-Trapping in Photocatalytic Applications." Thesis, 2020. http://hdl.handle.net/2440/128815.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Chemical Engineering and Advanced Materials, 2020
Chen, Jennifer I.-Ling. "Amplified Photochemistry with Slow Photons." Thesis, 2009. http://hdl.handle.net/1807/17741.
Повний текст джерелаHa, Sangwoo. "Slow light in coupled periodic photonic structures." Phd thesis, 2010. http://hdl.handle.net/1885/150691.
Повний текст джерелаLin, Che-Yun. "Silicon integrated nanophotonic devices for on-chip optical interconnects." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5720.
Повний текст джерелаtext
Patterson, Mark. "Classical and Quantum Optical Properties of Slow Light Photonic Crystal Waveguides." Thesis, 2009. http://hdl.handle.net/1974/5122.
Повний текст джерелаThesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2009-09-03 12:29:01.696
Petrov, Alexander [Verfasser]. "Slow light photonic crystal line-defect waveguides / von Alexander Petrov." 2008. http://d-nb.info/99053457X/34.
Повний текст джерелаKai-Chun, Yang, and 楊凱竣. "Investigation of Slow Light Based On Photonic Crystal Waveguide Lasers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/47729484879823215635.
Повний текст джерела國立交通大學
電子工程系所
95
We have successfully integrated photonic crystal line defect waveguide and edge-emitting Laser on GaAs wafer with E-beam lithography system and Inductive Coupled Plasma Etching system. We can extremely slow down the group velocity of propagation light by the slow light effect of photonic crystal line defect waveguide. The integration of photonic crystal line defect waveguide and edge-emitting Laser would play a very important role in the development and research of integrated optical circuits.
Chen, Yong-Fan, and 陳泳帆. "Storage and Manipulation of Photonic Information with Slow Light Effect." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/73107767155082764680.
Повний текст джерелаHuang, Shih-Chieh, and 黃世傑. "Study on Slow Light in Photonic Crystal Waveguides and Integrated Photonic Crystal Nanocavity Coupled Surface Emitting Lasers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/61191992536924010705.
Повний текст джерела國立交通大學
電子工程系所
95
In this dissertation, two optoelectronic devices based on photonic crystals are presented. These two devices with their unique properties derived from the special band structure of the photonic crystals will be useful for future photonic integrated circuits with multiple functions. The first device is an optical delay line that slows down the speed of the propagation light. A special waveguide based on line-defects in photonic crystal was designed to support waveguide mode with a significantly reduced group velocity. The second device is an integrated surface emitting laser. A regular in-plane laser was integrated with an photonic crystal nanocavity to couple the laser emission into a single mode surface emitting light. Both devices will be the key components for multi-function photonic integrated circuits. In the part of slow light, single line defect (W1 type) photonic crystal waveguides are first studied in order to understand the behaviors of propagation light over them. Very low propagation loss (~2dB/mm) of the fabricated waveguides is obtained. The rapidly diminishing Fabry–Perot oscillation periods at the cutoff region of the measured transmission spectrum determine extremely large group indices of 200~300. The group delay time measurements by detecting phase shift of 3G Hz modulated signals through the waveguides also show a very large time-delay (>200psec) near the cutoff. In comparison with theoretical group velocities derived from the band structure, these experimental results are ascribed to the effect of the defect modes at the band edge of the first Brillouin zone. Based on successful results of single line defect waveguides, we further investigate a photonic crystal coupled waveguide, where the unique guided mode band structure has a flat band region within the photonic band gap allowing for slow light observation. The spectral dependence of group velocity, which is measured by Mach-Zehnder interference method, indicates the existence of slow light modes around the inflection point of the unique flat band, rather than at the band edge. Time-domain observation of optical pulses propagating along two-dimension slab photonic crystal coupled waveguides is also demonstrated by using a high speed oscilloscope. By adjusting the wavelength of the input pulses toward the flat band of the coupled defect modes, an increasing duration time between reference and output pulses are clearly observed. An extremely small group velocity of 0.017c is thus obtained. Calculated group velocities show good agreement with our measured results. In the part of photonic crystal nanocavity lasers, we demonstrate an integrated nanocavity laser structure, where the laser light is directly coupled to photonic crystal nanocavities (H1 and H2) and emits out from the surface with selected wavelengths of the resonant modes of the nanocavities. Single mode emission with high Q factors [Q(H1)=1890 and Q(H2)=3800] is obtained with electrical pumping. Excellent temperature stability (0.097nm/0C) of laser emission from the nanocavity is observed as well. The wavelength shift versus temperature is about five times better than that of regular quantum well lasers. Dual wavelength emission from two side-by-side photonic crystal nanocavities is also demonstrated.
Yeh, Wen-Lan, and 葉文嵐. "Plane-Wave Expansion Method for Calculating Slow light Effefct of Photonic Crystals Waveguide." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/07123098237359227077.
Повний текст джерела國立臺灣大學
光電工程學研究所
94
In the thesis, a plane-wave expansion method for alculating the band structure of the photonic crystal is presented. As we known, photonic crystal structures provide a promising tool to control of the flow electromagnetic(EM) waves in the integrated optical devices. Therefore, there is a growing interest in developing photonic crystal-based waveguide components which can guide EM waves either along a line defect (a row of missing rods) or through coupled cavities. In the latter case, which we called coupled-cavity waveguides (CCW), the EM waves were tightly confined at each defect site, and photons can propagate by hopping, due to interactions between the neighboring evanescent cavity modes. It is observed that photon lifetime increases drastically and group velocity of photons tends towards zero at the waveguiding band edges of the periodic coupled cavities. In the photonic crystal CCW, low group velocity of light can result from localized modes in the defect. An analogy between Schrodinger''s equation and Maxwell''s equations allows us to use tight-binding (TB) approximation which was originally developed for electronic systems.
Lai, Yong-En, and 賴詠恩. "Study of Slow-Light Devices in Two-Dimensional Photonic Crystal Line Defect Waveguides." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/52627434302284401888.
Повний текст джерела龍華科技大學
電機工程系碩士班
100
This work is focused on the study of slow light effect of line defect waveguide in two-dimensional photonic crystal. Six configurations of slow-light waveguides are considered, including (1) waveguide adjacent to two rows of elliptical air holes, (2) waveguide adjacent to four rows of elliptical air holes, (3) waveguide adjacent to two rows of elliptical air rings, (4) waveguide adjacent to four rows of elliptical air rings, (5) moving the two adjacent rows of elliptical air rings, and (6) moving the four adjacent rows of elliptical air rings. The plane wave expansion method is employed to calculate photonic band structure and dispersion curves of line defect waveguides. Group index spectra of these slow-light waveguides can therefore be obtained. Group index and flat-band bandwidth can be greatly improved by adjusting air hole structures adjacent to line defect waveguides. Group index can be made larger than 54 by adjusting the aspect ratio of elliptical air holes or by moving the elliptical air rings. Compared to an original line defect waveguide (with a group index of 3.5), these slow-light waveguides show greatly improved performance.
Yang, Kung-Chou, and 楊恭州. "Modeling of Rapid Melt Growth and its application for Photonic Crystal Slow Light Waveguide Photodetector." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/94705420425329341928.
Повний текст джерелаChen, Chun-Yu, and 陳俊宇. "The Study on Photonic Slot Scheduling in All-optical WDM Ring Network." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/58710524895272359769.
Повний текст джерела國立交通大學
電信工程系所
95
In this research, we study the uni-direction single ring backbone network. The nodes on the backbone ring connect to the wireless base-stations to access the wireless network. And we use the ROF (radio over fiber) technology in the bas-stations. In this way, the system can integrate the wireless network into the backbone optical network. The goal of our research is to implement “all optical” network by using the low cost “wavelength insensitive” devices. In order to achieve this purpose, we adopt the PSR (photonic slot routing) concept and improve it. We overcome the drawback of PSR and make our system can achieve dynamic bandwidth allocation which is named Dynamic Slot Scheduling (DSS). Make our system can support “real time” network applications. Through our research, we hope the optical network will become more popular and let people can use optical network instead of suffering the high price ever. Thus the system can offer the wide bandwidth and high speed. In addition, the most important goal of our research is to make the performance of DPSA system can approach the system which use high cost “wavelength sensitive” devices, and let our system can offer basic QoS (Quality of Service).
Lai, Weicheng. "On-chip photonic crystal waveguide for chemical and biological sensing." Thesis, 2013. http://hdl.handle.net/2152/27635.
Повний текст джерелаtext