Tesis sobre el tema "Photoconducting"
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Ferguson, John B. "Transport studies of conducting, semiconducting and photoconducting star polymers". The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343144440.
Texto completo林思敏 y Sze-man Lillian Lam. "Synthesis and photoconducting properties of molecular and polymeric rhenium diimine complexes". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31243241.
Texto completoLam, Sze-man Lillian. "Synthesis and photoconducting properties of molecular and polymeric rhenium diimine complexes /". Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2521195x.
Texto completoKasai, S., T. Katagiri, J. Takayanagi, K. Kawase y T. Ouchi. "Reduction of phonon resonant terahertz wave absorption in photoconductive switches using epitaxial layer transfer". American Institite of Physics, 2009. http://hdl.handle.net/2237/12632.
Texto completoMokrinskaya, E. V., L. S. Tonkopieva, S. L. Studzinsky, N. A. Davidenko, I. I. Davidenko, A. A. Ishchenko y G. P. Grabchuk. "Internal Photoeffect in Films of Poly-N-Epoxypropylcarbazole with High Concentration of Anion Polymethine Dye". Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35274.
Texto completoPetty, David Matthew. "Transient photoconduction in phthalocyanines". Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277939.
Texto completoKim, Joong Hyun. "Efficient terahertz photoconductive source". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26608.
Texto completoCommittee Chair: Ralph, Stephen; Committee Member: Citrin, David; Committee Member: Cressler, John; Committee Member: Denison, Douglas; Committee Member: Mukhopadhyay,Saibal. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Halls, Jonathan James Michael. "Photoconductive properties of conjugated polymers". Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368812.
Texto completoLi, Di. "Investigation of Terahertz photoconductive antennas". Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526799.
Texto completoBerkin, J. "Transient photoconduction in amphorous materials". Thesis, University of Abertay Dundee, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328002.
Texto completoShura, Megersa Wodajo. "Photoconductive spectroscopy of GaSb thin films". Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1019937.
Texto completoHowson, Peter Allen. "Bulk photoconductive high voltage switching techniques". Thesis, University of Brighton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357154.
Texto completoDelord, Jean-Marie. "Echantillonnage photoconductif de signaux radio-fréquence". Chambéry, 2010. http://www.theses.fr/2010CHAMS026.
Texto completoThe great stability of mode locked laser used as optical "clocks" allows the realization of analog to digital converters operating up to radio frequencies. In this work we consider more specifically the study the photoconductive sampling of signais between 10 and 20 GHz. The use of ultra fast semiconductor matériel (low temperature grown GaAs) allows us to obtain the required bandwidth while the signal propagation is achieved by a metallic microwave waveguide deposited on the semiconductor substrats. Our contribution consists in the modeling and understanding of physical phenomena involved, particularly in the lightsemiconductor interaction and their impact on device performance. For that, we have developed several analytical models of photoswitching process, sampling process and frequency response of samplers. Finally, a detailed study of the origin of nonlinearities in the electrical response of the samplers under illumination allowed us to demonstrate the feasibility of devices with an effective resolution of 6 bits at a frequency of 10 GHz
Mason, Graeme. "Test and calibration of the Along Track Scanning Radiometer, a satellite-borne infrared radiometer designed to measure sea surface temperature". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293406.
Texto completoWolverson, D. "Optical and electronic properties of disordered semiconductors". Thesis, University of Exeter, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379465.
Texto completoStott, Colin Mark. "Synthesis and photoconduction properties of haloanthanthrone pigments". Thesis, Open University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255409.
Texto completoFaulks, Richard Wade. "Development of high performance terahertz photoconductive antennas". Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609730.
Texto completoChegoor, Prashant. "Optical response of polycrystalline mercuric iodide photoconductive detectors". [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001026.
Texto completoKhiabani, Neda. "Modelling, design and characterisation of terahertz photoconductive antennas". Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/14213/.
Texto completoWojtyk, James Taras Ché. "Studies of organic photochromic and photoconductive dye molecules". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0005/NQ42989.pdf.
Texto completoBaker, C. "Development of semiconductor materials for Terahertz photoconductive antennas". Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596274.
Texto completoWainwright, M. "New photoconductive polymers based on poly(N-vinylcarbazole)". Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382880.
Texto completoKlingshim, Christopher J. "Infrared photoconductive PbTe film processing and oxygen sensitization". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98614.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 33-34).
Infrared (IR) thermal detectors and photodetectors have significant applications including thermal imaging, infrared spectroscopy and chemical and biological sensing. In this work we focus on photodetectors, which typically use narrow gap semiconductor materials requiring cryogenic cooling to provide measurable signals above thermally generated noise. Our study investigates one class of photodetectors, namely photoconductive semiconductor films. When embedded within resonant cavities, these films are additionally capable of precise detection at narrow, selectable bands and enable the development of monolithically-integrated detectors that are physically small, highly responsive and able to record data autonomously. Lead chalcogenides such as PbTe are ideal photoconductive material candidates because (i) low-cost thermal deposition produces polycrystalline films that exhibit good mid-IR responsivity without being subject to lattice-matching constraints, and (ii) they do not require cryogenic cooling. We show that the responsivity of polycrystalline PbTe is enhanced by oxidation annealing. This investigation sought to determine a viable set of processing conditions for thermally depositing oxygen-sensitized PbTe photoconductors on Si substrates. Depositions were performed under high vacuum on the order of 1 0-6 Torr. Physical shadow-mask and photolithographic techniques were used to pattern the films in order to produce photoconductive samples with varied film and electrical contact geometries. The introduction of non-functional "dummy layers" within 100-300 pm of the usable samples prevented undesired film peeling during the lift-off process. PbTe films displayed an FCC rocksalt structure and slight preference for (200) texture when thermally deposited on a Si substrate. A 250-nm thick sample exhibited large photoconductivity, with responsivity higher than 100 V/W between 2-3 [mu]m wavelengths, a factor of 4 higher than literature values for similar films. Sn metal formed highly ohmic contacts with the PbTe layer, permitting Hall experiments that showed the film to be p-type with a carrier concentration of 1.49 x 1017 cm-3 and Hall mobility of 21 cm 2 V-1 s-. The carrier concentration was thermally activated with activation energy of 0.137 eV. These values are comparable to past experiments in which the film was sensitized by exposure to oxygen at ambient conditions. Further research is needed to establish the exact origin of the enhanced photoconductivity observed.
by Christopher J. Klingshim.
S.B. in Materials Science and Engineering
Ezdi, Kamran [Verfasser]. "Analysis and Simulation of Photoconductive Terahertz Antennas / Kamran Ezdi". Aachen : Shaker, 2011. http://d-nb.info/1074088115/34.
Texto completoLourenco, Manon d'Assuncao. "Evaluation of SIMOX substrates using photoconductive frequency resolved spectroscopy". Thesis, University of Surrey, 1991. http://epubs.surrey.ac.uk/776189/.
Texto completoZhang, Yi. "Modelling of photoconductive switches in high voltage power applications". Thesis, University of Brighton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239720.
Texto completoStone, Michael Raymond. "Photoconductive emitters for pulsed and continuous-wave terahertz generation". Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417735.
Texto completoHodge, Clifford Charles. "Photoconductive and induced absorption studies of novel semiconductor superlattices". Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46342.
Texto completoGunda, Rahul. "Performance analysis of high power photoconductive switch at elevated temperature". Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4310.
Texto completoThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (July 13, 2006) Includes bibliographical references.
Kim, Dae Sin. "Monte Carlo Modeling of Carrier Dynamics in Photoconductive Terahertz Sources". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11526.
Texto completoSaeedkia, Daryoosh. "Modeling and Design of Photoconductive and Superconductive Terahertz Photomixer Sources". Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/806.
Texto completoIn this dissertation, the photomixing in superconductors and photoconductors is studied, and comprehensive analytical models for the interaction of two interfering laser beams with these materials are developed. Integrated photomixer-antenna elements as efficient terahertz sources are introduced and arrays of these elements as high power terahertz sources are designed. Also, an array of photoconductive photomixer-antenna elements with integrated excitation scheme is proposed.
In a photo-excited superconductor, the fundamental equations for the motion of the carriers inside the superconductor material are used in connection with the two-temperature model to find an analytic expression for the generated terahertz photocurrent inside the film. In a photo-excited photoconductor, the continuity equations for the electron and hole densities are solved in their general form along with the appropriate boundary conditions to find photocurrent distribution inside the photoconductor film. It is shown that in a continuous-wave (CW) terahertz photomixing scheme, the resulting photocurrent contains a dc component and a terahertz traveling-wave component. The dependency of the amplitude and the phase of the generated photocurrent on the physical parameters of the photomixer, the parameters of the lasers, the applied dc bias, and the configuration of the device is explored in detail for a photoconductive photomixer made of low-temperature grown (LTG) GaAs and for a high-temperature superconductive photomixer made of YBa2Cu3O7-δ.
The developed models for the photoconductive and the superconductive terahertz photomixers are used to design new integrated photomixer-antenna devices. In these devices, the photomixing film simultaneously acts as an efficient radiator at the terahertz frequencies. Integrating the photomixing medium with the antenna not only eliminates any source to antenna coupling problem, but also makes the proposed device attractive for array configurations.
To increase the generated terahertz power, arrays of the photoconductive and the superconductive photomixer-antenna elements are proposed as CW terahertz sources. It is shown that a sub-milliwatt terahertz power is achievable from a typical superconductive photomixer-antenna array structure. The beam steering capability of the proposed devices is also investigated.
A photoconductive photomixer-antenna array with integrated excitation scheme is proposed, in which the laser beams are guided inside the substrate and excite the photomixer elements. In this way the laser power is only being consumed by the photomixer elements, and the photomixer-antenna elements can be integrated with other optical components on a single substrate. The whole structure is robust and less sensitive to vibration and other environmental parameters.
Su, Hansheng. "Development of optically controlled FSS and antenna using photoconductive approach". Thesis, Queen Mary, University of London, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610933.
Texto completoAbdul-Niby, Mohammed. "Photoconductive frequency resolved spectroscopy for hydrogen and helium implanted silicon". Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/804439/.
Texto completoKowalczuk, Emma K. "Simulating, fabricating and characterising photoconductive microwave switches for RF applications". Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14968.
Texto completoAriaudo, Myriam. "Analyse théorique de la génération optoélectronique d'impulsions ultrabrèves par photoconduction". Limoges, 1996. http://www.theses.fr/1996LIMO0049.
Texto completoIVERSON, ARTHUR EVAN. "THE MATHEMATICAL MODELING OF TIME-DEPENDENT PHOTOCONDUCTIVE PHENOMENA IN SEMICONDUCTORS". Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184068.
Texto completoHuang, Chih-Jung. "Opto-electronic class AB microwave power amplifier using photoconductive switch technology". Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4458.
Texto completoThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (April 26, 2007) Vita. Includes bibliographical references.
Kelkar, Kapil S. "Silicon carbide as a photoconductive switch material for high power applications". Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4469.
Texto completoThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 3, 2007) Includes bibliographical references.
Vu, Nhan Trung. "Characterisation of cadmium selenide material for high speed photoconductive switching systems". Thesis, University of Brighton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310102.
Texto completoO'Callaghan, Gregory Calum. "The serendipitous discovery of luminescent and liquid crystalline and photoconductive triphenoxazoles". Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7845/.
Texto completoReynolds, Gillian Althea Maria. "Electronic transport and photoconductive properties of resorcinol-formaldehyde-based carbon aerogels". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/39370.
Texto completoPaslaski, Joel Yariv Amnon Yariv Amnon. "High speed optoelectronics : photodiodes, Q-switched laser diode and photoconductive sampling /". Diss., Pasadena, Calif. : California Institute of Technology, 1990. http://resolver.caltech.edu/CaltechETD:etd-05092007-084117.
Texto completoAbdulmunem, Oday Mazin [Verfasser] y Martin [Akademischer Betreuer] Koch. "New Materials for Photoconductive Terahertz Antennas / Oday Mazin Abdulmunem ; Betreuer: Martin Koch". Marburg : Philipps-Universität Marburg, 2017. http://d-nb.info/114312488X/34.
Texto completoDE, CARRE PATRICE. "Etude experimentale des proprietes de transport non stationnaire dans inp par photoconduction". Paris 11, 1990. http://www.theses.fr/1990PA112124.
Texto completoHaristoy, Denis. "Synthese, mesomorphisme et proprietes de photoconduction de cristaux liquides de type calamitique". Université Louis Pasteur (Strasbourg) (1971-2008), 2000. http://www.theses.fr/2000STR13167.
Texto completoAbdulmunem, Oday M. [Verfasser] y Martin [Akademischer Betreuer] Koch. "New Materials for Photoconductive Terahertz Antennas / Oday Mazin Abdulmunem ; Betreuer: Martin Koch". Marburg : Philipps-Universität Marburg, 2017. http://d-nb.info/114312488X/34.
Texto completoGambaryan, K. M., V. G. Harutyunyan, V. M. Aroutiounian, T. Boeck, O. Marquardt y F. Schuette. "InAsSbP-based Quantum Dot Mid-Infrared Photodetectors: Fabrication, Properties and Applications". Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35354.
Texto completoErozbek, Gungor Ummugul. "Development Of A Compact Time-domain Terahertz Spectrometer Using Photoconductive Antenna Detection Method". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610440/index.pdf.
Texto completoHertzian Dipole&rdquo
method we estimated the generated THz power after the generation photoconductive antenna. Using this method, we showed that the v generated power is on the order of milliwatts, which is far larger than the expected power typical for these systems. The second, &ldquo
Open-Circuit Voltage&rdquo
method, allowed us to calculate the received power on the detection photoconductive antenna. Using this method we were able to show that the THz power generated and detected in these systems is on the order of microwatts. For the mode-locked fiber laser driven spectrometer we obtained on average a ~ 4 ps (0.25 THz) pulse length which corresponded to an average power in the range of 71.8 nW - 70.54 &
#956
W on a dipole antenna with a 6 &
#956
m dipole gap and 44 &
#956
m dipole length. Using the mode-locked Ti:Sapphire laser driven spectrometer we observed a ~ 2 ps (0.5 THz) pulse length and average power in the range of 0.54 nW &ndash
5.12 &
#956
W on a different dipole antenna with a 5 &
#956
m gap and 40 &
#956
m dipole length. Since these values agree with expected values for these systems we believe the &ldquo
Open-Circuit Voltage&rdquo
method is appropriate when trying to calculate the THz power.
Kaczmarek, Jean. "Mise en évidence des phénomènes de photoconduction dans des cristaux liquides ferroélectriques photosensibles". Thesis, Lille, 2018. http://www.theses.fr/2018LIL1R028.
Texto completoFerroelectrical materials possess the remarkable property to orienting themselves and generating surfaces charges under electric field. Dipole movements can be observed by measuring internal electric field or spontaneous polarization under alternative electric field. These organic materials are widely used in fast display devices. The aim of this work was to propose a direct current measurement of photoconduction phenomenon in ferroelectric non-photosensitive and photosensitive liquid crystals by charge carrier transport in SSFLC devices using time of flight methodology. The proposed method is based on charge carrier transport determination which providing access to characteristics parameters like mobility. Differentprocedures have been presented for mobility estimation from adding increasing dopant concentrations, electrical field and temperature, as well as charge behaviour pattern for exploitation and description. This materials show real influence of several parameters on the photocurrent shape signal and different mobility values under large scales of temperature. The validation of the method on photosensitive ferroelectric materials and obtained results by data treatment show that this method can be used to characterize another liquid crystal whatever its phase including SmC*
Haddab, Karima. "Propriétés électroniques du silicium amorphe hydrogéné : courants limités par charge d'espace et photoconduction". Paris 11, 1988. http://www.theses.fr/1988PA112052.
Texto completo