Dissertations / Theses on the topic 'Microdisk'
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Backes, Sacha Akira. "Microdisk lasers." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624363.
Full textWong, Susanna Wing Man. "Microdisk fabrication by emulsion evaporation." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/6006.
Full textLuscombe, Darryl L., and mikewood@deakin edu au. "Studies with voltammetric microdisk electrodes." Deakin University. School of Sciences, 1991. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20051201.153433.
Full textSlawik, Alexander John. "Nonlinear Analysis of Silicon Microdisk Resonators." Thesis, Northwestern University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3741327.
Full textThis dissertation addresses the character, control, and application of self-sustained oscillations in two-photon absorption dominated optical cavities. The complex interactions of photons, electrons, and thermal effects are understood to drive these emergent oscillations, with the dynamics captured by a system of ordinary differential equations. First, I explore the dynamics of the model and characterize the emergent optical oscillations as relaxation oscillations of a fast-slow system under certain conditions. Within this framework, I establish the entrainment of the oscillations to periodic forcing, providing an easy mechanism for control. The model is further extended to an opto-mechanical system which can be used as a sensor for atomic force microscopy. Analysis of the system predicts that two-photon absorption based effects can excite the mechanical modes of the sensor and increase the signal to noise ratio of the optical readout.
Michael, Christopher Paul Painter Oskar J. Painter Oskar J. "Optical material characterization using microdisk cavities /." Diss., Pasadena, Calif. : Caltech, 2009. http://resolver.caltech.edu/CaltechETD:etd-05282009-103510.
Full textJohnson, Thomas James Scherer Axel Painter Oskar J. "Silicon Microdisk Resonators for Nonlinear Optics and Dynamics /." Diss., Pasadena, Calif. : Caltech, 2009. http://resolver.caltech.edu/CaltechETD:etd-03232009-120417.
Full textAmarnath, Kuldeep. "Active microring and microdisk optical resonators on indium phosphide." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3513.
Full textThesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Koseki, Shinichi. "Monolithic waveguide coupled GaAs microdisk microcavity containing ingaas quantum dots /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Full textZamani, Hamidreza. "3C-SiC Multimode Microdisk Resonators and Self-Sustained Oscillators with Optical Transduction." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1429088651.
Full textZhou, Linjie. "Silicon microring and microdisk-based active devices using integrated p-i-n diodes /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20ZHOU.
Full textLi, Chao. "Silicon-based optical microresonator devices : polygonal microdisk channel filters and electro-optic modulators/switches /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20LI.
Full textKullig, Julius [Verfasser]. "Non-Hermitian physics in deformed optical microdisk cavities : asymmetric backscattering and Q-spoiling / Julius Kullig." Magdeburg : Universitätsbibliothek, 2017. http://d-nb.info/1147834547/34.
Full textMialichi, José Roberto. "Ressonadores de microdiscos com região ativa nanoestruturada bombeados por injeção eletrônica." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278523.
Full textTese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
Made available in DSpace on 2018-08-17T02:03:42Z (GMT). No. of bitstreams: 1 Mialichi_JoseRoberto_D.pdf: 4426656 bytes, checksum: f54944bc3408b22608afdd373e3445dd (MD5) Previous issue date: 2010
Resumo: Esta tese de doutorado apresenta resultados experimentais do crescimento de pontos quânticos de InAs diretamente sobre InGaAsP de baixa energia de bandgap (?g=1420 nm), cujo desenvolvimento visa a obtenção de um meio ativo com emissão na banda C (1520¿1570 nm) para a fabricação de ressonadores de microdisco. Baseado em resultados de fotoluminescência e microscopia de força atômica, o fenômeno da inter-difusão de elementos na interface InAs/InGaAsP é proposto e calculado, indicando a presença de Gálio e Fósforo na composição dos pontos quânticos. O ganho óptico de pontos quânticos de InAs crescidos sobre InGaAsP é também calculado com base nos resultados obtidos na análise de inter-difusão. Subseqüentemente, a teoria dos modos ressonantes no microdisco, particularmente os modos chamados whispering gallery modes (WGMs), é desenvolvida com o intuito de auxiliar os cálculos de fator de qualidade, fator de confinamento e corrente de limiar. Uma estrutura multicamada (diodo PIN) com região ativa baseada em pontos quânticos do sistema InAs/InGaAsP foi crescida por epitaxia de feixe químico (CBE) para a fabricação de ressonadores de microdisco. A fabricação dos microdiscos é feita por litografia óptica, corrosão por plasma de íons e ataque químico seletivo de InP. Feixe de íons focalizados (FIB) foi usado para substituir o ataque por plasma para diminuir a rugosidade das paredes dos discos. Os ressonadores de microdiscos são caracterizados elétrica e opticamente e os resultados são confrontados com base nos resultados teóricos apresentados ao longo da tese. Com base nos resultados das caracterizações eletro/ópticas dos ressonadores, correções como a inclusão de perdas ópticas da rugosidade da borda e aquecimento local foram acrescidas ao modelo teórico, resultando em boa concordância com os resultados experimentais. Por fim, apresentamos o desenvolvimento de dispositivos híbridos a partir de polímeros orgânicos depositados diretamente sobre microdiscos de InGaAs com o objetivo de integrar meio ativo orgânico com ressonadores inorgânicos para aplicações em optoeletrônica. Estes resultados foram obtidos durante o programa de doutorado com estágio no exterior no Laboratório Nacional de Nanotecnologia (NNL) vinculado à Università del Salento (Lecce/Itália)
Abstract:This doctorate¿s thesis presents the growth of InAs quantum dots directly on high bandgap InGaAsP (?g=1420 nm) barriers to be used as the active region of microdisk resonators with emission in the C-band (1520¿1570 nm). Based on photoluminescence and atomic force microscopy experiments, the occurrence of inter-diffusion on the InAs/InGaAsP interface is calculated, suggesting the presence of Gallium and Phosphorus in the quantum dots (QDs) composition. Based also on the inter-diffusion results, the optical gain of the InAs QDs is calculated. Subsequently, microdisk resonator whispering gallery modes (WGMs) are calculated and employed to predicting the cavity quality and confinement factors, as well as the threshold current. A PIN diode with an active region based on InAs QDs was grown by Chemical Beam Epitaxy (CBE) for the fabrication of current injected microdisk resonators. Microdisk fabrication process is performed using photolithography, reactive ion etching and InP selective wet-etching. Focused ion beam is used to replace the plasma etching in order to reduce the roughness of the disk¿s edge. Microdisks resonators are characterized electrically and optically and the measurements are analyzed based on the theoretical results presented along this thesis. Based on these measurements, optical losses caused by disk¿s edge roughness and local heating are added to our simulation tool, resulting in better agreement with the experimental results. Finally, we present the development of hybrid resonators using organic polymer deposited directly on inorganic microdisks integrating an organic active medium with inorganic resonators for optoelectronic applications. These results were obtained during our work at the National Nanotechnology Laboratory (NNL) and the University of Salento (Lecce/Italy)
Doutorado
Física da Matéria Condensada
Doutor em Física
Hermouet, Maxime. "Microdisques optomécaniques résonants en silicium pour la détection biologique en milieu liquide." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT013/document.
Full textEarly detection of disease's biomarkers such as cancer represents a major interest in the treatment process. Indeed, a diagnosis at an early stage considerably increases the chance of the treatment to be successful. Practically, tools allowing the rapid detection of tiny amount of biological compounds (antibodies, proteins, DNA...) in real samples such as blood or serum are needed.Over the last years, the advances and progresses of micro and nanofabrication techniques have allowed the development of Micro-Nano Electro Mechanical Systems (M/NEMS) in various fields of application including mass sensing. Thus, nano mass sensors reaching resolution down to the yoctogram level, the equivalent of a single proton have been demonstrated. Such resolution limit would theoretically allow these sensors to be used as potential biosensors. These results were nonetheless obtained in vacuum conditions which is incompatible with the biological world. Immersed in fluid, the performance of traditional M/NEMS are drastically degraded mostly due to the large viscous damping. A new type of object in the form of optomechanical microdisk resonators have recently emerged, demonstrating a huge potential for sensing in liquid. While M/NEMS classical electrical or optical transduction methods become very challenging in liquid, the astonishing sensitivity of the optomechanical transduction overcomes this major issue.In this context, this thesis work aims at developing a biosensor based on silicon optomechanical microdisk resonators for biosensing in liquid. Design, fabrication along with the complete characterization of theses devices is described. Eventually, a proof-of-concept of T5 virus detection at the pM level using these microdisks is presented
Witzany, Marcus [Verfasser]. "The lasing transition and strong mode coupling in InP quantum dot based GaInP microdisk cavity structures / Marcus Witzany." München : Verlag Dr. Hut, 2012. http://d-nb.info/1028783663/34.
Full textLee, Jonathan Chaosung. "Fabrication and Characterization of Single-Crystal Diamond Photonic Cavities." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10964.
Full textEngineering and Applied Sciences
Hon, Kam Yan. "Surface plasmon resonance-assisted coupling to whispering-gallery modes in micropillar resonators and silicon microdisk-based depletion-type modulators using integrated schottky diodes /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20HON.
Full textSelles, Julien. "Spectroscopie optique de nanostructures GaN/AlN insérées dans des microcavités planaires et des microdisques." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS236/document.
Full textThis thesis addresses the light-matter interaction in nitride nanostructures embedded in optical microcavities. By using micro-photoluminescence experiments, we study the optical properties of GaN/AlN quantum dots embedded in planar microcavities and those of GaN/AlN quantum wells in AlN microdisks.By placing quantum dots in planar microcavities, we are able to modify the emission diagram and increase the collection efficiency. The design of the microcavities is optimized by using numerical simulations based on transfer matrix method with an internal emitter. For an AlN microcavity with AlN/AlGaN Bragg mirrors, we show that the collection efficiency could be theoretical increase by one order of magnitude, which is confirmed by our micro-photoluminescence experiments on single quantum dots. This observation opens the way for advanced studies such as photon correlations experiments in the UV range.The second part of our work is devoted to the realization of a micro-laser operating in the deep-UV range at room-temperature. By using thin GaN/AlN quantum wells (2.8 monolayers), grown on silicon substrate and embedded in AlN microdisks, we observe a laser emission at 275 nm under pulsed optical pumping. This demonstration shows the strong potentiality for future developments of nitride-on-silicon nano-photonics
Wilde, Fabian. "Unidirectional photoluminescence emission of pierced microdisks /." München : Dr. Hut Verlag, 2009. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=017120456&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textHui, Kwun-nam, and 許冠南. "Light-emitting diodes incorporating microdisks and microspheres." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41633969.
Full textZhang, Xuhui, and 張旭輝. "GaN-based free-standing microdisks and nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/207202.
Full textpublished_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
Hui, Kwun-nam. "Light-emitting diodes incorporating microdisks and microspheres." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41633969.
Full textAmphlett, Jonathan Lee. "Numerical simulation of microelectrodes." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341628.
Full textSoltani, Mohammad. "Novel integrated silicon nanophotonic structures using ultra-high Q resonators." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31647.
Full textCommittee Chair: Prof. Ali Adibi; Committee Member: Prof. Joseph Perry; Committee Member: Prof. Stephen Ralph; Committee Member: Prof. Thomas Gaylord. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Fritzsch, Felix [Verfasser], Roland [Gutachter] Ketzmerick, and Peter [Gutachter] Schlagheck. "Resonance-Assisted Tunneling in Deformed Optical Microdisks / Felix Fritzsch ; Gutachter: Roland Ketzmerick, Peter Schlagheck." Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1227832486/34.
Full textHerring, Henry Frank. "Microdest - Micro-computer analyses and design of planar steel frames." Master's thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/23237.
Full textEvans, Stuart Anthony Grant. "Mesoporous platinum microdisc electrodes and the detection of hydrogen peroxide in analytical chemistry and scanning electrochemical microscopy." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271636.
Full textZeytin, Sinem [Verfasser]. "Towards optimisation of fish larval nutrition: the effects of new components in microdiet composition and feeding practices on larval digestive physiology / Sinem Zeytin." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1177033429/34.
Full textZeng, Yijia. "Circuits photoniques III-nitrure avec des cristaux photoniques et des microdisques." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS070.
Full textNitride semiconductors are extremely interesting for integrated photonics on silicon. They have a large transparent window and dispose of non zero nonlinear susceptibilities which enable second and third order nonlinear experiments. In this context, this thesis has been devoted to integrated photonic circuits with microresonators such as photonic crystals and microdisks. The microcavity design and the fabrication process have been optimized in order to obtain a near infrared resonant mode with a quality factor up to 34000 for photonic crystals and 80000 for microdisks. I carried out harmonic conversion experiments such as second harmonic generation (SHG) and third harmonic generation (THG). With THG, by combining simply an optical objective and a CCD camera, I carried out near infrared photonic crystal modes imaging with a subwavelength spatial resolution (300 nm). I also did SHG imaging on microdisks with an optical excitation in resonance with the gallery mode for the pump laser. The last part of the work is dedicated to the demonstration of phase-matched SHG in microdisk photonic circuits between the TM-0-0-X and TM-0-2-2X modes by varying the microdisk diameter with a very small step (8 nm). These experiments have been done for resonant modes with quality factors around 10000.These demonstrations show the potential of III-nitride semiconductors for the realization of two dimensional optical circuits on silicon
Lafleur, Gaël. "Nouvelles architectures de composants photoniques par l'ingénierie du confinement électrique et optique." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30263/document.
Full textOptical and electrical confinement using Al(Ga)As layer oxidation is a key milestone in the fabrication of active and passive GaAs-based photonic components. To optimize those devices, through the control of the optical and electrical confinements, a better modelling of oxidation process and a better understanding of optical properties of aluminum oxide (AlOx) is required. One part of this work is focusing on a throughout experimental study of AlGaAs oxidation kinetics, where I studied different important parameters such as wafer temperature, gallium composition, atmospheric pressure and mesa geometry. Then, I developed a new predictive model taking into account the process anisotropy, thus allowing a better temporal and spatial of AlAs oxidation front evolution. Finally, I could exploit this technological process to realize whispering gallery mode microdisks as well as slot optical waveguides, and I have characterized this latter photonic devices
李鎮安, Cheng-an Lee, and 李鎮安. "Tunable LiNbO3 Microdisk Resonators." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/u69a3y.
Full text國立臺北科技大學
光電工程系研究所
101
This thesis studies the tuning characteristics of the microdisk device produced on the –z face of LiNbO3 by thermo-optic effect and the fabrication the undercut microdisk structure on the +z face of LiNbO3. The influences of the parameters on the device characteristics and the produced structures are discussed. For the first studied topic, it is found that the 40μm-diameter microdisk device has the quality factor as high as 5.8×10^4, which is three times higher than the 20μm-diameter one. The thermo-optic tuning characteristics of the 40μm-diameter microdisk device show that the temperature increase causes the resonant wavelength to have a red shift, which is the same as theoretical inference. In the wavelength range from 1535nm to 1560nm, the thermo-optic tuning rates for the three resonant modes were 21.5pm/°C, 22.2pm/°C and 22.6pm/°C. For the second studied topic, the fabrication techniques, including proton exchange, ion implantation, and wet etching, are used to produce the undercut microdisk structure on the +z face of LiNbO3. The proton-exchanged region can be etched by HF acid. When the etching depth achieves the depth of ion implantation, the etching would proceed laterally and the undercut microdisk structure is formed. Because the bottom face of the microdisk is the -z face of LiNbO3, which is easily etched by HF acid, the microdisk diameter would become smaller during the etching process. The hexagon shape of the microdisk structure is caused by the dependence of the etching rate on the lattice plane in LiNbO3.
Huang, Yu-Long, and 黃玉龍. "The Manufacture of microdisk tool by EDM and the Application of microdisk tool." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/04137710218707985677.
Full text國立雲林科技大學
機械工程系碩士班
92
This paper was divided into two parts：the process of manufacturing micro-tool and the application of inventing stopping pin. The make of the tool adopted WEDG (Wire Electrical Discharge Grinding) and used the way of shifting two disks. Therefore, it can easily control the angle of the knife of micro-milling tool. Now, micro-grinding and micro-milling tool (forty-eight teeth, knife of ninety and forty-five) have been successfully finished. The diameter of micro-grinding and micro-milling are 1.9mm and the width of them 8~15µm. Using micro-tool to machine Al. If enlarging the diameter of the knife, increasing the numbers of teeth, and cooperating with high spin which can increase the speed of tangent, the removal of materials and surface quality can be raised largely. Besides, cross and the pin of multi-disk have been successfully make. The micro-structure of these pins can be divided into liquid tank (the pin of cross and the pin of multi-disks) and micro-slit (one step and two step). Micro-tool has been applied in machining micro-slit of the pin. The upper width of micro-tank is 25~30µm, the lower width of it is 10~15µm, the depth of it is 20µm, and the length of it is 2.5mm. These pins proceeded the test in lab：the cross of the pin got above 400 dots once and the pin of multi-disks got 100~140 dots. The diameter of these dots is 20~50µm.
Li, Xia. "Evanescent field coupled microdisk cavities." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2222/index.html.
Full textHsing, Jin-Yuan, and 邢晉源. "InGaAs Quantum Dots Microdisk Lasers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/rbc3pd.
Full text國立中山大學
光電工程學系研究所
101
This thesis describes the fabrication of microdisk lasers that contain gain materials with InGaAs quantum dots. The spontaneous emissions from the specific sizes of quantum dots are enhanced by the whispering gallery modes (WGMs) of the microdisk cavity. First, the lasing wavelength range of InGaAs QDs microdisk cavities is examined. A series of microdisk lasers with diameters that vary in steps of 10 nm from 1.62 μm to 1.86 μm is used, which have a first-order WGM with m=8 enhance the ground state emission of quantum dots in the wavelength range from 1180 nm to 1263 nm. The width of continuous wavelength tuning range is about 80 nm. The lowest threshold power among these QD-containing microdisk lasers is only about 13 μW with a spontaneous emission factor β= 0.674. Second, the bonding and anti-bonding modes of vertically-coupled double microdisk cavities are investigated by utilizing the optical coupling between them. Vertically-coupled double microdisk lasers with three gaps of 100, 200, and 480 nm were fabricated. Room-temperature lasing spectra of the vertically-coupled double microdisks with three gaps but similar diameters around 1.9 μm were obtained. The threshold powers for gaps of 100 nm and 200 nm were approximately 70 μW and 50 μW, respectively. These devices are attractive for use in multiple terahertz light sources based on frequency difference generation. Third, a QD-containing disk cavity is placed on an AlAs/GaAs DBR substrate to develop a mechanically stable current injection structure. The thermo-optical coefficients of AlAs and GaAs for wavelengths around 1200 nm were determined to be 2.2105×10-4 nm/K and 2.8789×10-4 nm/K, respectively. Three emission peaks at 1040 nm, 1090 nm, and 1146 nm were obtained from a DBR-supporting microdisk laser with diameter D=2 μm at T=110 K. These emission peaks were also verified as the first-order WGMs with m=12, 13, and 14. Finally, the emission behaviors of microdisk lasers at T=80 K when a metal nanoparticle is on the top surface of the microdisk cavity are studied. Without the metal NP, the threshold power of the microdisk laser is around 635 μW for the first-order WGM with m=22 at λ=1160 nm. With the metal NP, the threshold power of the microdisk laser is increased to 2.45 mW for the first-order WGM with m=24 at λ=1098 nm.
Michael, Christopher Paul. "Optical Material Characterization Using Microdisk Cavities." Thesis, 2009. https://thesis.library.caltech.edu/2219/1/cpm_cit_thesis_1side.pdf.
Full textSince Jack Kilby recorded his "Monolithic Idea" for integrated circuits in 1958, microelectronics companies have invested billions of dollars in developing the silicon material system to increase performance and reduce cost. For decades, the industry has made Moore’s Law, concerning cost and transistor density, a self-fulfilling prophecy by integrating technical and material requirements vertically down their supply chains and horizontally across competitors in the market. At recent technology nodes, the unacceptable scaling behavior of copper interconnects has become a major design constraint by increasing latency and power consumption—more than 50% of the power consumed by high speed processors is dissipated by intrachip communications. Optical networks at the chip scale are a potential low-power high-bandwidth replacement for conventional global interconnects, but the lack of efficient on-chip optical sources has remained an outstanding problem despite significant advances in silicon optoelectronics. Many material systems are being researched, but there is no ideal candidate even though the established infrastructure strongly favors a CMOS-compatible solution.
This thesis focuses on assessing the optical properties of materials using microdisk cavities with the intention to advance processing techniques and materials relevant to silicon photonics. Low-loss microdisk resonators are chosen because of their simplicity and long optical path lengths. A localized photonic probe is developed and characterized that employs a tapered optical-fiber waveguide, and it is utilized in practical demonstrations to test tightly arranged devices and to help prototype new fabrication methods. A case study in AlxGa1−xAs illustrates how the optical scattering and absorption losses can be obtained from the cavity-waveguide transmission. Finally, single-crystal Er2O3 epitaxially grown on silicon is analyzed in detail as a potential CMOS-compatable gain medium due to its high Er3+ density and the control offered by the precise epitaxy. The growth and fabrication methods are discussed. Spectral measurements at cryogenic and room temperatures show negligible background losses and resonant Er3+ absorption strong enough to produce cavity-polaritons that persist to above 361 K. Cooperative relaxation and upconversion limit the optical performance in the telecommunications bands by transferring the excitations to quenching sites or by further exciting the ions up to visible transitions. Future prospects and alternative applications for Er2O3 and other epitaxial rare-earth oxides are also considered.
Chang, Chih-Hao, and 張志豪. "Optical properties of InAs/GaAs microdisk microcavities." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/mt3795.
Full text國立交通大學
電子物理系所
97
The optical properties of microdisk (MD) microcavities with embedding InAs QDs in GaAs membrane are investigated. The emission spectra of the MD microcavities of different sizes are observed by micro-photoluminescence (μPL) measurements. A number of shape emission lines have been characterized as the whispering-gallery modes (WGMs). Analytic approximation method and three-dimensional finite-difference time-domain (3D-FDTD) simulations are used to identify the azimuthal and radial mode numbers of the measured WGMs. Power dependent and time-resolved μPL measurements have also been performed and discussed. Spontaneous emission enhancement is observed at room temperature, which is attributed the weak coupling regime. Directional radiation patterns are observed by μPL intensity mapping contour plots. Near-field resonance patterns of different WGMs measured by scanning near-field optical microscopy (SNOM) technique are also presented.
Fan, Chih-Bin, and 范智彬. "Fabrication of Microdisk Resonator on Lithium Niobate." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/thpv92.
Full text國立臺北科技大學
光電工程系研究所
99
This thesis on the research of micro-disk resonator on lithium niobate with under-cut structure. With its horizontal and vertical high refractive index contrast, making it a more effective limitation of the light field in order to reduce light transmission caused by the loss.Under-cut structure is fabricated by using ion implantation and wet etching techniques to achieve, the process produced a specific pattern on lithium niobate. The chromium film and photoresist are used to wet etching and ion implantation mask respectively.By using helium ion implantation in lithium niobate crystal, it caused the lattice damage in particular depth. Then the wet etching of lithium niobate can remove the damaged area. Experimentally, we use this process to produce the micro-disk resonator device with under-cut structure. It has certain amount roughness of surface in traditional wet etching. In this study,we use two technique a short etching of proton exchange and high-temperature heat treatment. The former is the proton exchange which increase lithium niobate crystal lattice damage. To increases the lattice damage will help to accelerate the etching rate, and the roughness of substrate is first etched. The latter is close to the melting temperature of lithium niobate. The surface of lithium niobate will reflow, so the surface tension help to do some modification. If lithium niobate with high temperature the lithium oxide will out-diffusion, we have to suppress it. We placed some powder of lithium niobate to suppress lithium oxide out-diffusion in heat treatment process. We use the tapered fiber to replace optical waveguide. In this paper, taper fiber produce as electro-heating method, heat generated by arc discharge soften the fiber and it will stretch by step motor.
Chen, Chih-Hao, and 陳志豪. "Optical properties of coupled double microdisk microcavities." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/70087974691514184539.
Full text國立交通大學
電子物理系所
98
The optical properties of microdisk microcavities with embedded InAs quantum dots (QD) in GaAs membrane are investigated. The microdisks are transferred to a sapphire substrate and fabricated closely spaced double microdisks by using a fiber tip. The emission spectra of the double microdisks are investigated by micro-photoluminescence (μ-PL) measurements. several sharp emission lines arise from the Whispering gallery modes (WGMs) of the microdisks have been observed. Polarization resolved μ-PL and finite-difference time-dominate simulation (FDTD) are used to identify the azimuthal and radial mode number of the measured WGMs. By continuously increasing the refractive index of one of the double microdisks using laser local heating, we observed clear molecular modes with bonding states and antibonding states due to a strongly coupling of the double microdisk. We found that the higher-order WGMs always have smaller coupling strengths. This phenomenon can be explained by the effective potential confining the electromagnetic wave in the microdisk microcavity.
Chien, Hao-Che, and 錢皓哲. "Study of InGaAs Quantum-Dot Microdisk Lasers." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/05884907651323542659.
Full text國立臺灣大學
光電工程學研究所
100
Microdisk cavities have been exploited as high quality factor resonators due to the excellent confinement of whispering gallery modes (WGMs) and may be applied as low threshold laser cavities. Microdisks with embedded quantum dots (QDs) offer the potential of ultralow threshold semiconductor lasers due to the combination of the small mode volume and delta-like electron density of states. They can also be used to fabricate GaAs-based long-wavelength diode lasers for fiber communication systems. Both of the optically-pumped and current-injection microdisk lasers embedded with InGaAs QDs are studied in this dissertation. The fabrication techniques and measurement results of optical properties are discussed for these two kinds of devices. In the study of optically-pumped microdisk lasers, we measured a 10-μm-diameter microdisk lasers by micro-photoluminescence (micro-PL) experiments. The corresponding quality factor can be larger than 14000. The radial modes can be greatly suppressed by introducing a small hole at the disk center. We also tried to fabricate microdisks with cavity size near 3 μm by two-step wet-etching in order to reduce the lasing modes inside the cavities. The numbers of lasing modes are reduced in these smaller microdisks. In temperature-dependent experiments, we have shown that the alignment of QD and whispering gallery mode energy may affect the lasing threshold. In the study of current-injection microdisk lasers, we have fabricated our devices with Benzocyclobutene (BCB) polymer claddings. The first room temperature lasing phenomenon of QD injection microdisk lasers is demonstrated. The lowest threshold current at room temperature is 0.45 mA, which is measured from a 6.5-μm-diameter microdisk. In temperature dependent experiments, the negative characteristic temperature (T0) of QD microdisk lasers is observed. The transition temperature from negative T0 to positive T0 is around 150 K. From our rate-equation simulations, the experimental results indicate that the quality factor of our microdisk cavity is high. Finally, the dynamic behaviors of both optically-pumped and current-injection microdisk lasers are studied. By the time-resolved micro-PL experiments, the QD carrier lifetimes corresponding to on-resonance and off-resonance wavelengths of a microdisk are determined. The average spontaneous emission rate is enhanced by a factor of 4.3, which is owing to the Purcell effect. The transient behaviors of current-injection QD microdisk lasers are studied at room temperature. Suppressed relaxation oscillations and fast turn-on behaviors are observed. The suppressed relaxation oscillation can be attributed to the enhanced spontaneous emission factor in microdisk lasers and the short turn-on time is due to the reduced carrier lifetime. A large-signal direct modulation at 1 Gbps is demonstrated. In temperature-dependent dynamic measurements, both of the transient lasing and steady-state lasing from side modes are suppressed at temperatures higher than 250 K. Therefore, the quantum-dot microdisk lasers have the potential to realize the single-mode operation under high-speed modulation at room temperature in highly integrated optical transceiver modules.
Chen, Po-Kuang, and 陳柏光. "Tantalum Oxide Microdisk Resonator and Its Application." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/73qc97.
Full text國立臺北科技大學
光電工程系
106
Tantalum pentoxide has advantages of high thermal stability, high chemical stability, high refractive index, high dielectric constant, and low optical loss, and has been widely applied in fabricating optical components. In this thesis, the tantalum pentoxide film is deposited on the silicon substrate by radio-frequency magnetron sputtering. Its material and optical properties are analyzer by atomic force microscope, X-ray diffraction, and ellipsometer. The undercut tantalum pentoxide microdisk resonators with 40μm diameter have been successfully fabricated by using photolithography, film deposition, and lift off, and wet etching. The measured intrinsic quality factor is up to 1.645×104 and the free spectral range (FSR) is 11.5nm. When the device temperature raises, the resonance wavelength is red-shifted and its thermo-optic modulation rate was 7.2 pm/°C. Quantum dots are a kind of semiconductor material with nanostructure and have the advantages of narrow full width at half maximum (FWHM), wavelength adjustability, high radiation efficiency, and good luminescent stability. In this thesis, the quantum dots thin film deposited on tantalum pentoxide microdisk resonators are used as gain medium. In the experiments, perovskite quantum dots in the toluene solution are successfully synthesized and are doped in the PMMA for the formation of thin film. The emission wavelength of perovskite quantum dots in the toluene solution and the perovskite quantum dots incorporated PMMA films is in the range from 520.9nm to 520.8nm. Their PL center wavelengths are 520.9nm and 520.8nm, respectively. The fabricated devices have the three layer structure of (tantalum pentoxide)/(perovskite quantum dots incorporated PMMA thin film)/(tantalum pentoxide). The SU-8 negative resistance has the advantages of good etching resistance, good thermal stability, and small optical absorption. Even though using the thick SU-8 film, the films have good uniformity and vertical sidewalls. In the thesis, the undercut 40μm diameter SU-8 microdisk resonators have been successfully fabricated. Their intrinsic quality factor is up to 1.098×104 and the FSR was 12.3nm. The SU-8 microdisk devices have the advantages of high quality factor, easy fabricated process, and low fabrication cost. They have the potential used as quantum dots incorporated main structure for the application of micro laser. In the research of waveguide coupled lithium niobate microdisk resonators, the structure of titanium diffusion waveguide coupled microdisk resonator is designed. The amount of optical field coupling to microdisk is promoted by tuning the depth position between the microdisk resonator and the titanium diffusion waveguide. In experiments, the 60μm diameter LiNbO3 microdisk resonators are fabricated with two kinds of microdisk depth (0μm and 2μm) and three kinds of distance between microdisk and waveguide (1μm, 0μm, and -1μm). The measurement results show that the optical field resonance in the microdisk resonator occurs only when the microdisk depth is 2μm, and the distance of microdisk embedded into waveguide is 1μm. The highest intrinsic quality factor is as high as 7.846×102 and the FSR is 6.7nm. The optical resonance phenomena of other waveguide-coupled microdisk resonators are not observed due to the less amounts of optical field coupling from the titanium-diffused waveguide.
Ryh-Shin, Tsai, and 蔡日興. "Nearfield and farfield emission characteristics of microdisk lasers." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/22738888075664801367.
Full text國立交通大學
光電(科學)研究所
83
In this thesis, we discuss the resonance cavity modes of microdisk lasers and the corresponding farfield emisssion patterns. Besides conventional circular microdisk lasers, we introduce the point matching method to solve the cavity modes of noncircular microdisks. And we further discuss how the changes in disk shape influences the farfield emission pattern of microdisk lasers.
He, Jheng-Yu, and 何政育. "Enhancement of Resonant Properties of LiNbO3 Microdisk Devices." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/6u79s4.
Full text國立臺北科技大學
光電工程系研究所
100
In this work, we fabricated LiNbO3 microdisk devices, which have high refractive index and quality factor, we also measure and analyze the characteristic of resonance. The –z face under-cut structure is fabricated by using ion implantation and wet etching techniques to achieve, its horizontal and vertical high index contrast, making it a more effective limititation of the light field in the resonator, reducing the scatter and radiation loss when light transmission. In the experiment, we can enhance the resonantor’s characteristic and lower the scatter loss of the device by use the surface thermal reflow process, approaching the melting temperature of the lithium niobate, making the surface more smoothly. In this way, we can reduce the roughness surface and irregularity pattern boundary, which is cause by wet etching. The thin region of the fiber taper is, the strong the evanescent field extend, which can elevate the coupling efficiency. By using the strong evanescent field in the tapered region we can couple it to micro disk. In the thesis, coupling to micro disk with 20μm diameter, thermal reflow non-thermal reflow and three hours separately, in non-thermal reflow we can get the FSR about 15.9nm, quality factor 4565,in thermal reflow three hours we can get FSR about 15.6nm, quality factor 18601.As shown the result, our lithium niobate micro disk have quality factor high as 104. In the future we will combine the electro-optic and nonlinear optic effect, fabricating high effective lithium niobate micro disk resonance device.
Chu, Cheng-Hao, and 朱承澔. "Monolithic Waveguide-Coupled InAs Quantum-Dot Microdisk Modulators." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/90121399610198250868.
Full text國立臺灣大學
光電工程學研究所
102
In this thesis, we demonstrate the monolithic integration of an InAs quantum-dot microdisk modulator and its waveguide coupling structure. By designing the coupling structure with numerical simulation and fabrication technique, we verify the monolithic mode coupling between the microdisk and the waveguide. The device was fabricated by process mainly based on electron beam lithography and dry plasma etching in order to define the structure precisely. Optical characterization was performed by a fiber-based transmission measurement setup. Mode coupling between the cavity and the waveguide was confirmed by measuring the transmission spectrum through the waveguide. Quality factors of the microdisk cavity were found to be about 300. Depth of dips up to 15dB is observed at the resonance wavelength of whispering-gallery modes of the microdisk cavity. The strength of mode coupling can be controlled by varying the disk size and the cavity-waveguide gap. Mode shift owing to the electric-field-induced refractive index change can be observed when a negative bias is applied to the microdisk cavity. By varying the voltage over the cavity, transmitted light with specific wavelength could be modulated through Kerr effect. The quadratic electro-optic coefficient was found to be 8.88×&;#12310;10&;#12311;^(-18) m^2/V^2, which is larger than that in bulk GaAs materials and in GaAs/AlGaAs quantum well structures. From the aspect of fundamental physical theory, the measured electro-optic effect is attributed to the quantum confined Stark effect and Kramers-Kronig relations. The optical modulation is also demonstrated through time-resolved measurement, and the extinction ratio of 1.47 can be achieved. The quantum-dot microdisk cavities show the potential for optical modulation applications. &;#8195;
Chao, Shih-Shing, and 趙士興. "The coupling characteristics between fiber and microdisk microcavities." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/07300520230796634463.
Full text國立交通大學
電子物理系所
98
We used optical fiber tip to collect emissions from the sidewall of microdisk cavities with embedding InAs/GaAs quantum dots. By using optical fiber tip, the collection efficiency of some particular whispering-gallery modes (WGMs) can be improved by a factor of 10. Finite-difference time-domain simulations are used to calculate waveguide coupled microdisk cavity. Scanning near-field optical microscopy (SNOM) is also used to study optical modes of microdisk cavity. Near-field images show that WGMs are standing wave in microdisk cavity. WGMs with different radial mode numbers are also investigated. Finally, we found that near-field images of the WGMs reveal m azimuthal maxima around the disk circumference. The results explain the intensity imaging arises from the superposition between the WGMs and InAs QDs field.
Hong, Jay-Zway, and 洪傑睿. "Fabrication and Characterization of Current-injected Microdisk Lasers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/35132151726600484001.
Full text臺灣大學
光電工程學研究所
98
Microdisk lasers play important roles of light sources with low power consumption in large-scale photonic integrated circuits. Microdisks whose cavities confine light to small volumes support high-Q whispering-gallery mode (WGM) resonances, so they are considered to be potential candidates for the next-generation semiconductor lasers used in optical long-distance telecommunications. In this thesis, we fabricated two kinds of current-injected microdisk lasers- InGaAsP quantum-well and InGaAs quantum-dot microdisk lasers with disk size about 10μm in diameter. We measured the mode shift with varied temperature from 78K to room temperature. We use InGaAsP quantum well samples to fabricate the electrically pumped microdisk laser devices, which can be further applied as laser sources in photonic integrated circuits. We have successfully fabricated disk lasers by e-beam lithography, ICP dry etching and selective wet etching techniques. Using a benzocyclobutene (BCB) polymer cladding which decreased redshift with varied temperature, the metal electrodes can be more easily made. We apply a DC current source for current injection. The threshold current is 28μA at 78K. The highest temperature where lasing can still be achieved is 250K. At this temperature, the threshold current for a 10-μm -diameter device was about 0.69 mA, and the Q factor is about 930. We fabricated InGaAs QD microdisk lasers using two-steps wet etching to produce the double-disk structure. From the electroluminescence spectrum of our InGaAs QD microdisks by pulse current injection, we can get the lowest lasing threshold current at 150K. Below 150K, the characteristics temperature is negative. We can operate the device which lasing threshold current is 0.65mA at room temperature, and the largest WGM quality factor observed is 3700.
Kao, Chung-Min, and 高崇閔. "1.55 μm Current-injected Quantum-well Microdisk Lasers." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/15428408381652184499.
Full textTsai, Sung-Yin, and 蔡松穎. "Quantum Dots Laser of Coupled microdisk-ring structure." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/77061785529475446234.
Full text國立中山大學
光電工程學系研究所
99
In this thesis, we used the E-Beam lithography to fabricate a device of coupled microdisk-ring laser on the sample which was grown by molecular beam epitaxy (MBE), and analyzed the coupled effect of the device. The active layer was composed of six compressively strained InGaAs quantum dots (QDs) that were designed to support gain at 1200nm. Under the active layer, we replaced sacrificial layer by distributed bragg reflector (DBR). The purpose of the DBR was used like a mirror to reflect the particular wavelength which located at DBR’s stop band, so the energy would be confined in the active layer. The device was composed of a microdisk and a ring. The diameter of the microdisk was 3μm, and the width of the ring is 250nm. The microdisk was placed in the ring, and the gap of both was 100nm. After design, we simulated whether the device could generate coupled modes by Finite-Difference Time-Domain (FDTD). In experiment, we used the E-Beam lithography to define negative pattern on the sample which is spread with the PMMA. We also used the thermal evaporation to evaporate the metal, and lift the metal to form our pattern. Finally, we used the dry etching to transform the pattern to the epitaxial layer, and then the device was completed. In measurement, we used the micro-PL to measure our device, and got a successful result. The result showed our device generated eight resonant modes. The measured result matched the simulation result. Through simulation, the device generated three coupled modes, 1173.8nm, 1206nm, and 1214nm. We expect that the device will be used to generate terahertz source in the future.
CHAN, MIN-YANG, and 詹旻洋. "Electro-optically Tunable Microdisk Resonators with ITO Films." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/w754q7.
Full text國立臺北科技大學
光電工程系
107
This thesis proposes an electro-optically modulated lithium niobate microdisc resonant element with ITO electrode is proposed. The circular electrode above the dish and the suspended wire structure connected to it have high electro-optic modulation rate and high quality factor. characteristic. Among them, the thickness of the lithium niobate micro-disc is only 0.4 μm, and the evanescent field extending to the periphery of the dish is large, which causes severe light absorption, so that the resonance light field cannot be generated. In the paper, the ITO transparent conductive layer is used as the electrode layer. Compared with the metal electrode, the high transmittance of ITO can cover the resonant light field at the edge of the microdisk, effectively enhancing the electric field strength and the electric field/light field. The overlap integral is used to achieve electro-optical modulation with high efficiency and high quality factor. The experimental results show that the TE and TM resonance modes of the 20m microdisk-shaped component have the essential quality factors of 8.2×104 and 7.5×104 when the ITO electrode is not added, and TE and TM after depositing the 20 nm ITO film layer. The maximum essential quality factors of the mode are still 1.8×104 and 7.1×103, respectively. The FSR of TE and TM resonance modes are changed from 17.68 nm and 18.13 nm to 17.82 nm and 18.31 nm, respectively. The best electro-optical modulation micro-disc components in the literature (Opt. Express 25(1), 124-129, 2017) have only TE mode electro-optic modulation, and the modulation rate is 3.41 pm/V. The paper proposes a novel electro-optical modulation micro-disc component with ITO film. The electro-optic modulation rate of TE and TM modes can be as high as -30.19 pm/V and -24.31 pm/V, respectively. The TE mode electro-optical modulation rate increases. 8.9 times, and has high electro-optic modulation rate of TE mode and TM mode.
Johnson, Thomas James. "Silicon Microdisk Resonators for Nonlinear Optics and Dynamics." Thesis, 2009. https://thesis.library.caltech.edu/1079/1/TJRJ_thesis_submitted.pdf.
Full textSilicon is incredibly well-studied as an electronic material. Since the out-migration of William Noyce, Gordon Moore, and the rest of the original Fairchild Semiconductor class from Shockley Semiconductor, silicon has only grown in prominence. Untold billions have been expended on research, development, and manufacture, and now silicon is perhaps the most well-controlled commercial material on Earth. For all that, the use of silicon as a mechanical material, though envisioned in the late 1950s, largely became viable only after the advent of large-scale silicon processing for microelectronics. As an optical material, silicon also has a long pedigree, with most of the positive focus on its excellent optical transparency and the enormous potential for improvement residing in its lack of effective emission.
This thesis concerns an alternate route to the generation of light in silicon: the nonlinear route. Resonant elements play a critical role in making this viable. The ability to build up optical intensity in the confined volume of a microresonator reduces the input power required to achieve a given energy density. Silicon also has certain excellent nonlinear properties: a large Raman gain coefficient, for example, and an appreciable Kerr effect. Unfortunately, silicon also exhibits significant two-photon absorption (TPA) in the convenient telecommunications wavelength bands. As such, the build-up of optical energy in silion may also be accompanied by a build-up of TPA-induced free-carrier populations. These populations may serve to limit the efficiency of nonlinear processes or to generate additional nonlinear behavior in their interactions with optical fields.
Thus two important stepping-stones on the way to the low-power,low-footprint use of silicon as an optical material are: the need to reduce optical losses in the optical elements, and to reduce or modify the populations of free carriers generated in the nonlinear optics regime. This thesis will present design considerations of, fabrication techniques developed for, and characterization techniques of high-Q silicon microresonators. In the course of this work, we have created silicon microdisk resonators with quality factors as high as 5×10^6, and high-Q silicon microdisks with free-carrier lifetimes in the deep subnanosecond regime (Q=5–6×10^5 and carrier lifetimes ≤ 240 ps). These results, with no indication that higher quality factors or shorter carrier lifetimes are not possible in similar structures, indicate that coherent, CW optical generation in passive silicon microresonators is approaching feasibility.
Shen, Huan-Yan, and 沈奐言. "Coupled microdisk Quantum Dots Laser By Selective Pumping." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/d38gs3.
Full text國立中興大學
光電工程研究所
107
The goal of this research is to use the PT-symmetry principle to produce a single-mode microdisk laser. We use electron beam lithography and ICP-RIE dry etching to fabricate a coupled microdisk structure on an InGaAs quantum dot wafer. In the process, PMMA and tantalum nitride are used as Mask and Hard mask respectively, and the pattern is written by electron beam lithography. Then, the pattern is transferred from PMMA to tantalum nitride by ICP-RIE, and the sample is etched by ICP-RIE. Dry etching anisotropic etching to produce a cylindrical structure with a height of about 2 μm and a diameter of 2.5 μm; wet etching using HF, etching the Al0.5Ga0.5As layer at the bottom to create a micro-disk structure. Use COMSOL software for component simulation to find the modalities that may occur in the sample''s luminescence band. Analyze the fixed gap (100nm). Different microdisk diameters (2μm, 2.5μm, 3μm, 3.5μm, 4μm) are different from the fixed diameter (2.5μm). The influence of the gap (30 to 400 nm) on the coupling strength of the microdisk determines the graphic design based on the results. The microscopic photoluminescence spectroscopy at room temperature and low temperature (80K) was carried out, and the measurement of single microdisk, double microdisk pumping, and selective pumping was performed for low temperature measurement. The comparison of the spectra, gave a more pronounced PT-symmetry single mode light with a wavelength of 1118 nm.