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Dissertations / Theses on the topic 'Quantum dots – Optical properties'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Nkaule, Anati Nomxolisi. "Synthesis, optical and morphological characterization of CdSe/ZnSe quantum dots for cytotoxicity studies." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020637.

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Colon cancer (CC) ranks high in morbidity and mortality amongst the most frequent occurring cancers worldwide. Mortality rates are mostly caused by mis-diagnosis and the poor efficacy of treatment. The aim of this study was to enhance our insights of quantum dots, for early detection and targeted drug delivery, thereby reducing toxicity to normal cells and reducing side effects that are caused by previous colon cancer medicine. The synthesis, characterization and cytotoxicity studies of CdSe/ZnSe quantum dots (QDs), nanocrystals are reported. Toxicological properties of the Cd2+ core are reduc

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2

Yang, Weidong. "Electronic structure and optical properties of self-assembled InAs quantum dots /." view abstract or download file of text, 1999. http://wwwlib.umi.com/cr/uoregon/fullcit?p9947989.

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Thesis (Ph. D.)--University of Oregon, 1999.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 150-156). Also available for download via the World Wide Web; free to University of Oregon users. Address: http://wwwlib.umi.com/cr/uoregon/fullcit?p9947989.

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3

Rostron, Rebecca Joy. "Optical properties of luminescent alkylated-silicon quantum dots." Thesis, University of Newcastle Upon Tyne, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556004.

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Under excitation by visible light, alkylated-silicon quantum dots emit an orange- coloured luminescence, peaking at around 650 nm. Following continuous illumination, a decay of the luminescence over a time-scale of 5-10 minutes was monitored concur- rently with a photo current generated by ejection of electrons from the dots. The photoluminescence and current both decayed to non-zero, steady-state values during irradiation by visible laser light at incident intensities in the range 0.25-0.3 ± 0.01 kW /cm2; on cessation, the non-conducting photoluminescent state was substantially regained. Thes

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4

Boero, Mauro. "Transport and optical properties of semiconductor microstructures." Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307232.

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5

Fry, Paul William. "Optical spectroscopy of InGaAs GaAs self assembled quantum dots." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275221.

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6

Hinzer, Karin. "Optical properties of GaAs-based self-assembled quantum dots and quantum dot lasers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2002. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ66155.pdf.

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7

Wei, Zhifeng, and 魏志鋒. "The optical response of semiconductor self-assembled quantum dots." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37098202.

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8

Pugh, Loretta. "Optical properties of GaAs/AlGaAs quantum wells and dots." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624468.

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9

Ji, Botao. "Synthesis and optical properties of plasmonic fluorescent quantum dots." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066674/document.

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Grâce aux plasmons de surface des nanoparticules métalliques et aux propriétés optiques et électroniques des quantum dots (QDs), les nanostructures QD/métal suscitent beaucoup d'intérêt. Cependant, bien que prometteurs, les hybrides QD/or colloïdaux n'ont été que rarement obtenus.Nous avons mis au point la première méthode de synthèse généralisée conduisant à des structures hybrides cœur/coque/coque QD/SiO2/Au (appelées QDs dorés). Tout d'abord, les QDs hydrophobes sont encapsulés individuellement dans des billes de silice par émulsion inverse. Les nanoparticules obtenues sont ensuite recouver

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10

Mallon, Gary Paul. "The electronic and optical properties of magnetic quantum dots." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/30623.

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Advances in lithographic technology have made it possible to fabricate systems in which electrons are confined magnetically. With an inhomogeneous circularly symmetric magnetic field, Bz, that was modulated so as the magnetic field was zero in the centre, electrons could, theoretically, be confined to a disk region. These systems are referred to as magnetic quantum dots, and the purpose of this thesis is to investigate their properties. The eigenstates of the single electron system are calculated using new methods based on wave function matching. These enable the eigenstates to be determined f

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11

Jöns, Klaus [Verfasser]. "Optical and quantum optical properties of site-controlled and strain-tuned quantum dots / Klaus Jöns." München : Verlag Dr. Hut, 2013. http://d-nb.info/1045987514/34.

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12

Hinzer, Karin. "Optical properties of gallium arsenide-based self-assembled quantum dots and quantum dot lasers." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6055.

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Three-dimensional confinement of carriers eliminates the problem of thermal spreading of carriers observed in higher-dimensional systems. Uniform self-assembled quantum dots (QDs) are obtained using the spontaneous islanding of highly strained III-V semiconductors grown with standard epitaxy. Visible stimulated emission has been obtained with red-emitting AlInAs QDs in AlGaAs barriers. Continuous (CW) threshold current densities below 100A/cm2 have been measured at low temperatures and QD material gain larger than 1.7 x 104 cm-1 demonstrate good material quality. Room temperature lasing has al

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13

Olbrich, Fabian [Verfasser]. "Optical and quantum-optical properties of telecommunication-wavelength semiconductor quantum dots on GaAs substrates / Fabian Olbrich." München : Verlag Dr. Hut, 2019. http://d-nb.info/1188515888/34.

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14

Larsson, Arvid. "Optical spectroscopy of InGaAs quantum dots." Doctoral thesis, Linköpings universitet, Halvledarmaterial, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-64707.

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The work presented in this thesis deals with optical studies of semiconductor quantum dots (QDs) in the InGaAs material system. It is shown that for self-assembled InAs QDs, the interaction with the surrounding GaAs barrier and the InAs wetting layer (WL) in particular, has a very large impact on their optical properties. The ability to control the charge state of individual QDs is demonstrated and attributed to a modulation in the carrier transport dynamics in the WL. After photo-excitation of carriers (electrons and holes) in the barrier, they will migrate in the sample and with a certain pr

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15

Baer, Norman. "Optical and electronic properties of InGaAs and nitride quantum dots." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=983398089.

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16

Nilsson, Ruben. "Optical properties of fluorescent quantum dots for super-resolution bioimaging." Thesis, KTH, Tillämpad fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169624.

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17

Nilsson, Ruben. "Optical properties of fluorescence quantum dots for super-resolution bioimaging." Thesis, KTH, Tillämpad fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172345.

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18

Cusack, Mark Alexander. "Electronic and optical properties of semiconductor quantum wells and dots." Thesis, University of Newcastle Upon Tyne, 1996. http://hdl.handle.net/10443/1039.

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The influence of structural size and geometry on the electronic states, optical transitions and nonlinear optical response in semiconductor quantum wells and dots has been investigated. A quantum mechanical theory of optical nonlinearities in semiconductors has been used in conjunction with the empirical pseudopotential band structure method to determine the structural parameters leading to optimum second harmonic generation in p-type asymmetric GaAs/AlxGa₁₋xAs quantum well structures. Maximum confinement of all participating states is of paramount importance for optimising such responses. The

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19

Kowalik, Katarzyna. "Symmetry effects in optical properties of single semconductor quantum dots." Paris 6, 2007. http://www.theses.fr/2007PA066105.

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Cette thèse porte sur l'étude des effets de réduction de la symétrie des boîtes quantiques de semiconducteur auto-assemblées III-V et II-VI sur leurs propriétés optiques, et tout particulièrement sur la levée de dégénérescence des états excitoniques, qui joue un rôle primordial pour intriquer en polarisation des photons à partir de la cascade radiative d'un biexciton. Nous avons d'une part étudié l'influence d'un champ électrique appliqué soit latéralement (dans le plan des boîtes quantiques), soit parallèlement (à leur direction de croissance), et d'autre part un champ magnétique latéral. On

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20

Prodanović, Nikola. "Semiconductor quantum dots : intraband electronic, optical and carrier dynamical properties." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7873/.

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Brief fabricational and applications surveys on semiconductor quantum dots and the subsequent motivation for further development of theoretical modeling are presented. In order to study the electronic structure of quantum dots, k • p models are introduced. Both the 8 band k • p model and the effective mass model were used in order to study electronic structure of quantum rods. Existence of bound state in continuum in quantum rods is demonstrated. The vibrational structure and electron–phonon interaction in semiconductor quantum dots was studied via bulk models for self assembled quantum dots a

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21

Siverns, Philip Douglas. "Optical and structural properties of InGaAs self assembled quantum dots." Thesis, Imperial College London, 2001. http://hdl.handle.net/10044/1/7354.

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22

Ozfidan, Asli Isil. "Electron-Electron Interactions in Optical Properties of Graphene Quantum Dots." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32857.

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In this thesis, I present a theory of electron-electron interactions in optical properties of graphene and transition metal dichalcogenides (TMDCs), two dimensional nanostructures with a hexagonal lattice. We start our discussion with electron-electron interactions in artificial rings for which the strength of interactions can be varied and exact results can be obtained. The artificial rings are described by the extended Hubbard model and solved using an exact diagonalization method in real and Fourier space of configurations. Exact and analytical results for charged rings are obtained in th

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23

Vachon, Martin. "Optical properties of single quantum dots in high magnetic field." Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/28029.

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The photoluminescence of quantum dots is studied in a high magnetic field regime where the cyclotron frequency is comparable to the confinement energy. Applying a magnetic field perpendicular to the lateral potential plane lifts the shell degeneracy and magneto-photoluminescence spectroscopy therefore provides a probe to investigate the energy shell structure of quantum dots. By isolating a single quantum dot, the inhomogeneous broadening from a distribution of dot sizes and compositions is eliminated and the fine structure of the spectrum is revealed. The orbital splitting of angular momentum

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Makinana, Sinovuyo. "Synthesis and characterization of CdSe quantum dots for solar cell application." Thesis, University of Fort Hare, 2017. http://hdl.handle.net/10353/5994.

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This study shows a detailed report on the morphological, structural and optical properties of CdSe QDs synthesised by the hot injection method. Cadmium acetate dihydrate and Se powder were used as cadmium and selenide precursors, respectively. Various QD sizes were achieved by synthesizing in temperature range of 150ºC, 175ºC, 200ºC, 225ºC, 250ºC, 275ºC and 300ºC, respectively. The as synthesized QDs by the hot injection method were cross-examined for their morphological, structural and optical using HRTEM, FTIR, XRD, RS, and UV-Vis spectroscopy techniques respectively. FTIR analysis has revea

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25

Schulz, Stefan. "Electronic and optical properties of quantum dots a tight binding approach." Göttingen Sierke, 2007. http://d-nb.info/986393991/04.

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26

Stier, Oliver [Verfasser]. "Electronic and optical properties of quantum dots and wires / Oliver Stier." Berlin : Wiss.-und-Technik-Verl, 2001. http://d-nb.info/975250280/34.

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27

Kamarudin, Mazliana Ahmad. "Growth and optical properties of self-assembled GaSb/GaAs quantum dots." Thesis, Lancaster University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547945.

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28

Malik, Surama. "Tuning of optical properties of InAs/GaAs self assembled quantum dots." Thesis, Imperial College London, 2003. http://hdl.handle.net/10044/1/7557.

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29

Narayan, Vinay. "The electronic and optical properties of low dimensional structures." Thesis, University of Exeter, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361318.

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30

McGinnis, Brian Patrick. "Four-wave mixing and the study of optical nonlinearities in semiconductors and semiconductor quantum dots." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184890.

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This dissertation describes the study of various nonlinear optical effects in both bulk and quantum-confined semiconductors. Transverse effects in increasing absorption optical bistability are considered in bulk CdS for both single beam and wave mixing geometries. Measurement of the temporal response of BiI₃ quantum dots is described using degenerate four-wave mixing and explained theoretically. Finally, the experimental techniques developed to measure the one- and two-photon absorption coefficients of CdS quantum dots in glass are described along with the latest theoretical description and in

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31

Pancholi, Prasoon. "Influence of barrier layer on optical and electronic properties of quantum dot molecules." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 90 p, 2008. http://proquest.umi.com/pqdweb?did=1605158171&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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32

Nootz, Gero. "Experimental and theoretical study of the optical properties of semiconductor quantum dots." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4581.

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The aim of this dissertation is to gain a better understanding of the unique electronic structure of lead salt quantum dots (QDs) and its influences on the nonlinear optical (NLO) properties as well as the time dynamics of the photogenerated charge carriers. A variety of optical techniques such as Z-scan, two-photon excited fluorescence and time-resolved pump probe spectroscopy are used to measure these properties. The one-photon as well as the degenerate and nondegenerate two-photon absorption (2PA) spectra are measured and the electronic wave functions from a four-band envelope function form

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33

Naeem, Ali. "Optical properties and exciton dynamics of colloidal quantum dots, rods, and platelets." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/90269/.

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The linear optical properties and exciton dynamics of different semiconductor nanostructures have been studied. A model to describe the absoprtion spectra of cadmium selenide (CdSe) nanoplatelets (NPLs) has been developed, which allows the extraction of parameters relating to excitons confined within the thickness of the NPLs. Giant oscillator strength transitions (GOST) have been observed in NPLs with a lifetime limited dephasing of the ground state excitons at low temperature of about 1 ps, using transient resonant four wave mixing in heterodyne detection. The observation of the GOST effect

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Trojnar, Anna. "Electronic, Optical and Magnetic Properties of Self-assembled Quantum Dots Containing Magnetic Ions." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24238.

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There is currently interest in developing control over the spin of a single Manganese (Mn) ion, the atomic limit of magnetic memory, in semiconductor quantum dots (QDs). In this work we present theoretical results showing how one can manipulate the spin of Mn ion with light in a QD by engineering Mn-multi-exciton interactions through quantum interference, design of exciton and bi-exciton states and application of the magnetic field. We develop a fully microscopic model of correlated exciton and bi-exciton interacting with the Mn ion. The electrons and heavy holes, confined in the QD, appr

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35

Andreev, Thomas. "Growth and optical properties of GaN and InGaN quantum dots dops with rare earth ions." Université Joseph Fourier (Grenoble), 2006. http://www.theses.fr/2006GRE10020.

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Ce travail est porté sur les propriétés structurales et optiques de structures à boîtes quantiques III-nitrures dopées avec des terres rares réalisées par épitaxie à jets moléculaires. Pendant la croissance, les terres rares ont une influence drastique sur les boîtes, expliquée par les propriétés surfactantes des atomes de terres rares. La caractérisation optique et structurale montre que les boîtes sont dopées efficacement avec les ions de Eu, Tm et Tb. D'autres localisations des terres rares ont été trouvées, par exemple, pour le Tm, à l'interface du GaN des boîtes et de l'AlN. Ce travail s'

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36

Larsson, Niklas. "Optical and Structural Properties of CuxS Quantum Dots Concerning H2O/Ethanol Solvent Ratio." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-154249.

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Nanotechnology, one of the most interesting sciences today will no doubt have an enourmous impact on tomorrow's society and industry. One of the most interesting nanomaterial that has been discovered is the semiconductor quantum dot (QD). This material shows interesting novel properties such as a size-dependent band gap, which is an effect caused by the quantum confinement effect in all three dimensions. Due to this phenomenon the absorption spectrum can be tuned to the desired value by adjusting the size of the QD. This thesis aims to investigate how the solvent ratio of H2O/Ethanol affects t

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37

Shahid, Robina. "Green Chemical Synthesis of II-VI Semiconductor Quantum Dots." Doctoral thesis, KTH, Funktionella material, FNM, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104980.

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Nanotechnology is the science and technology of manipulating materials at atomic and molecular scale with properties different from bulk. Semiconductor QDs are important class of nanomaterials with unique physical and chemical properties owing to the quantum confinement effect. Size dependent optical properties make research on semiconductor QDs more attractive in the field of nanotechnology. Semiconductor QDs are usually composed of combination of elements from groups II–VI, III–V, or IV–VI of the periodic table. Group II-VI semiconductor QDs (ZnS, ZnSe, ZnO, CdSe, CdS) are most extensively s

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38

Mirzaei, Javad. "Optical and Electro-optical Properties of Nematic Liquid Crystals with Nanoparticle Additives." The Royal Society of Chemistry, 2011. http://hdl.handle.net/1993/30280.

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Liquid crystals (LCs) are an interesting class of materials that are attracting significant attention due to their ever-growing applications in a wide variety of fields such as liquid crystal display (LCD) technology, materials science and bioscience. In recent years, along with the developments of materials at the nanoscale, doping LCs with nanoparticles (NPs) has emerged as a very promising approach for improving LC properties. Nanoparticle additives can introduce novel effects on optical and electro-optical properties of nematic liquid crystals (N-LCs), such as altered molecular alignment,

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Ministro, José João Henrique. "A study on the synthesis and the optical properties of InP-based quantum dots." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/16836.

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Mestrado em Química - Química Inorgânica e Materiais<br>The aim of this work is the study of the optical properties of InP quantum dots (QDs) and the exploration of a new method for the synthesis of InP/CdS core-shell QDs. A multitude of research on colloidal QDs requires detailed knowledge of the relation between optical and structural properties, namely the sizing curve, the intrinsic absorption coefficient and the molar extinction coefficient. In this work, InP QDs were synthesized and structurally and optically characterized. The sizing curve was established from the average QD diame

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NGUYEN, TUAN ANH. "INVESTIGATIONS OF ELECTRONIC STRUCTURE AND OPTICAL PROPERTIES OF II-VI SELF-ASSEMBLED QUANTUM DOTS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1143155352.

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Kunz, Sergej. "Magneto-optical properties of individual GaAs/AlGaAs single quantum dots grown by droplet epitaxy." Thesis, Toulouse, INSA, 2013. http://www.theses.fr/2013ISAT0003/document.

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Nous avons effectué dans ce mémoire des études de magnéto-luminescence sur des boîtes quantiques individuelles de GaAs insérées dans une matrice de GaAlAs, boîtes qui se distinguent de la plupart des systèmes étudiés par l’absence des contraintes. Nous avons pu mesurer l’impact de l’orientation cristalline du substrat sur lequel s’effectue la croissance de ces boîtes sur les propriétés magnéto-optiques.Nous avons pu présenter les premières expériences pratiquées sur des structures à boîtes quantique GaAs « gouttelettes » à charge ajustable, élaborées sur substrat orienté (001). La structure fi

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Hsu, Chia-Wei, and 許嘉緯. "Optical properties of ZnTe semiconductor quantum dots." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/2yd72k.

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碩士<br>中原大學<br>應用物理研究所<br>91<br>Optical properties of type-II ZnTe/ZnSe quantum dots have been investigated by using photoluminescence (PL), time-resolved PL, and contactless electro-reflectance (CER). As the excitation power is increased, a blue (red) shift of PL peak is found in quantum dots (wetting layers). These results are explained by a band-bending model (localization due to potenial fluctuation). In addition, a carrier-transfer phenomenon from wetting layer to quantum dots is observed in the temperature-dependent and time-resolved PL measurements.

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Lee, Jia-Ren, and 李佳任. "Optical Properties of Compound Semiconductor Quantum Dots." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/88958228103592150795.

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Bianucci, Pablo 1975. "Optical resonators and quantum dots: and excursion into quantum optics, quantum information and photonics." Thesis, 2007. http://hdl.handle.net/2152/3189.

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Modern communications technology has encouraged an intimate connection between Semiconductor Physics and Optics, and this connection shows best in the combination of electron-confining structures with light-confining structures. Semiconductor quantum dots are systems engineered to trap electrons in a mesoscopic scale (the are composed of [approximately] 10000 atoms), resulting in a behavior resembling that of atoms, but much richer. Optical microrseonators are engineered to confine light, increasing its intensity and enabling a much stronger interaction with matter. Their combination opens a m

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Renard, Julien. "Optical properties of GaN quantum dots and nanowires." Phd thesis, 2009. http://tel.archives-ouvertes.fr/tel-00475438.

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Nous avons étudié par diverses techniques de photoluminescence les propriétés optiques d'hétérostructures à base de composés III-N de structure wurtzite. Des expériences de photoluminescence résolues en polarisation nous ont permis de mettre en évidence l'influence des contraintes et du confinement sur la structure de bande d'une hétérostructure. L'étude de boites quantiques uniques GaN/AlN a pu être réalisée sur un système original : une boite quantique comme tranche d'un nanofil. Ce nouveau système nous a ainsi permis d'identifier les émissions de l'exciton et du biexciton. Nous avons égalem

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Chen, Chih-Yao. "Simulation of Optical Properties ofGaN/AlN Quantum Dots." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2707200518183400.

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Chen, Chih-Yao, and 陳致堯. "Simulation of Optical Properties ofGaN/AlN Quantum Dots." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/66284934225246357379.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>93<br>Due to the intrinsic built-in piezoelectric effect, the conventional calculation of InAs quantum dot without considering the piezoelectricity is not suitable. Referring to the study proposed by A. D. Andreev et al. in 2000, we perform the optical property calculation about the GaN quantum dots. First, we obtain the characteristic function of the QD shape, then applied it to obtain the strain distribution according to the classical elasticity. Second from obtained strain tensors, we can derived the piezoelectric potential and substitute it into strain-moment in

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Hsu, Fang-Chi, and 許芳琪. "The Optical Properties of InAs/GaAs Quantum DOts." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/25310126477594794986.

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碩士<br>國立臺灣大學<br>物理學研究所<br>87<br>In this thesis, we present a detailed study of optical properties of InAs/GaAs quantum dots (QDs). I. Photoluminescence measurement (PL) Photoluminescence measurement has been carries out in two parts: Part I: Temperature dependence From the measurement of temperature dependence, we found that activated carriers tunneling through dots with different size do exist. And the activation energy increases with the increasing dot size. Besides, the peak energies of the PL spectra do not go along with Varshni law well.

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Hong, Kuo-Bin, and 洪國彬. "Optical Properties of Wurtzite InGaN/GaN Quantum Dots." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/36269892581312760285.

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博士<br>國立臺灣大學<br>應用力學研究所<br>98<br>The aim of this article is to investigate the optical properties of wurtzite InGaN quantum dots (QDs) grown on GaN substrates with arbitrary crystal orientation. The fully-coupled piezoelectric model and four-band k.p Hamiltonian are developed to analyze the effects of size, shape, composition, and wetting layer (WL) on the electromechanical fields and optical properties. Moreover, the electromechanical equations and Hamiltonian for arbitrary crystal orientation can be derived from the coordinate transformation. Numerical results revealed that the fully cou

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Lee, Jia-Ren, and 李佳任. "Electro-Optical Properties of InAs/GaAs Quantum Dots." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/92621321968287667767.

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Abstract:

碩士<br>國立臺灣師範大學<br>物理研究所<br>89<br>ABSTRACT The electro-optical properties of InAs/GaAs Quantum Dots have been studied by comparing the photoreflectance and photoluminescence spectra at various temperatures. The samples used in our experiments were grown by Metal-Organic Chemical Vapor Deposition on the n+ dopped GaAs substrates. The photoreflectance spectral features below the energy gap of GaAs originate from the InAs wetting layer , and the relative spectral intensity between the InAs wetting layer and the GaAs energy gap increases with the decreasing of temperature .

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