Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 138 for “"Photodetector"”.
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Chiral Polymer Photodetector
A polymer photodetector is fabricated using polythiophene with chiral alkyl side chains. The Cotton effect is observed in the CD spectrum of the photodetector, indicating an unequal absorbance of left- and right-handed circular polarized light (CPL). The photodetector is proven to be able to …
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A quantum dot heterojunction photodetector
… thesis presents a new device architecture for photodetectors utilizing colloidally grown quantum dots as the principle photo-active component. We implement a thin film of cadmium selenide (CdSe) quantum dot sensitizers, sandwiched between an electron-transporting titanium dioxide (TiO2) layer …
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Dilute Nitride Based Vertical Cavity Enhanced Photodetector
… of a p-i-n / vertical cavity enhanced (VCE) photodetector structure with different material compositions of dilute nitride. The tunable selectivity is taken into account during the development in order for the VCE photodetector to be able to perform as a tunable receiver. In the first part, …
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Fabrication of nonlithographic semiconductor quantum wire infrared photodetector
… novel semiconductor quantum wire infrared photodetectors in the long- and very long-wavelength regions. The infrared photodetectors are based on intersubband transitions in semiconductor quantum wires and have the potential for higher operational temperature, increased signal-to-noise …
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Optimization of charge collection efficiency in MSM photodetector
The effects of different geometries, heights and concentrations per unit area of gratings in the active region of a metal semiconductor metal photo-detector have been analyzed for enhanced charge collection through electromagnetic field analysis. Plots of the electric field amplitude as it …
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Strechable crumpled graphene photodetector with plasmonically-enhanced photoresponsivity
… widely explored for flexible, high-performance photodetectors due to its exceptional mechanical strength, broadband absorption, and high carrier mobility. However, the low stretchability and limited photoabsorption of graphene have restricted its applications in flexible and high-sensitivity …
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Design considerations for Ge-on-Si waveguide photodetector
In integrated photonic circuits photodetector is one of key components, modern applications require that photodetector has a high 3 dB bandwidth. The ultimate limit for the response time for conventional photodetectors (like vertically illuminated photodiode, Schotky photodiode, MSM photodetector …
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NIR silicon photodetector enhancement using photonic crystal cavity resonators
The growing demand for efficient infrared sensors for light ranging, thermal-cameras, and soon, free-space optical communications has yet to be answered. In this study, we use polycrystalline silicon in conjunction with a photonic crystal cavity (PhCC) to enhance light absorption for efficient …
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GRAPHENE BASED DUAL FUNCTIONAL, SELF-POWERED PHOTODETECTOR FOR DAILY UV SENSING
… dots have been widely used for ultraviolent photodetectors. However, the relatively low responsivity limits the practical application. New 2D materials incorporated with quantum dots heterostructure are emerging to improve the performance of photodetector. In this work, three types of …
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Position and velocity sensing measurements using an integrated VCSEL and pin photodetector assembly
Made available in DSpace on 2011-05-25T14:40:31Z (GMT). No. of bitstreams: 2 Jefvert_Thomas.pdf: 7841540 bytes, checksum: 9ef9792a0cc33ab293a45a73dce41a0b (MD5) license.txt: 4064 bytes, checksum: 723d56f6be0d118060f2052c1b59a730 (MD5)
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Development of high-speed P-i-N photodetector for 50Gb/s optical link in data centers
Various emerging applications such as high-performance computing (HPC) have been pushing the speed limit of communication. The growing dependence on the optical interconnect in data centers results from its superiority over traditional electrical interconnects to transmit data at high speed over …
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Design and modeling of high speed P-i-N photodetector for 50 GB/S optical fiber links
… links, high speed receiver devices, known as photodetectors, need to be designed properly so as not to present a bottleneck in the performance of optical links. With the aid of microwave modeling, we can characterize the performance of the photodetector and therefore improve the devices. This …
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Design, fabrication, and characterization of a lithium niobate optomechanical photodetector based on released whispering-gallery-mode microdisk resonators
Lithium Niobate (LiNbO3) is a piezoelectric material that also exhibits promising optical characteristics such as low optical loss and high electro-optic coefficient, making it an interesting choice for Radio Frequency (RF) micro-opto-electro-mechanical systems (MOEMS) and devices, electro-optical …
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Development of InP DHBT for 5G millimeter-wave power amplifier and GaAs photodetector for 50 Gb/s optical link
… optical transceivers require high-speed photodetector to be paired with high-speed vertical-cavity surface-emitting lasers (VCSELs) for short-range transmission at 850 nm. High-speed photodetector holds the key to higher data rate and lower energy consumption, which can help resolve the …
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Développement d'un dispositif intégré de photodétection de grande sensibilité avec discrimination spectrale pour les laboratoires sur puce
… implementation and testing of this integrated photodetector device. The work is divided in two main parts: first, the design of a CMOS photodetector with integrated preamplifiers, and secondly the design, realization and characterization of integrated optical filters for fluorescence detection. …
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Waveguide Integrated Optoelectronics Using Two-Dimensional Materials
… The current state of waveguide integrated photodetectors and modulators is reviewed and provides a context for the work detailed in the following chapters. The first dual-function graphene photodetector and modulator is demonstrated in a simple geometry that allows simultaneous use of both …
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THz imaging and microscopy, a multiplexed near-field TeraHertz microscope
… is acquired for every integration time of a THz photodetector which leads to long acquisition times. A solution to this problem is a multiple sub-wavelength aperture array – an imaging spatial modulator with each of its sub-wavelength apertures acting as a separate pixel. The device function is …
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Design, fabrication and characterization of terahertz quantum-well photodetectors
Terahertz (THz) photodetectors are important in the fully exploration and development of electromagnetic spectrum. However, a fast and sensitive THz photodetector ready for array integration is not available. A THz Quantum-well Photodetector (QWP) has the properties of being fast, sensitive, …
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Studies on Optically Induced DC-Voltage in Thin Film Structures
… thermal noise. In order to design and optimize a photodetector that can overcome those limitations, I first built an instrument to evaluate the functionality of the proposed devices. Different devices and structures were fabricated and tested by means of photodetection in order to clearly identify …
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Germanium photodetectors on amorphous substrates for electronic-photonic integration
… processing to <450C. In this thesis, a germanium photodetector is fabricated while adhering to these processing constraints in order to demonstrate a proof of concept for BEOL integration. In order to obtain high quality active material, crystalline Ge was grown on Si0 2 by implementing selective …
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