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 21 for “"Avalanche Photodiodes"”.
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EXCESS NOISE STUDIES ON AVALANCHE PHOTODIODES
… range was constructed. Commercially available avalanche photodiodes (APDs) could be illuminated over the wavelengths 420 nm to 2 gm and the noise current spectrum from 10 Hz to 10 kHz could be measured by a phase sensitive detection system. The noise above normal shot noise in germanium, …
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3D Camera Based on Gain-Modulated CMOS Avalanche Photodiodes
… concept of range camera exploiting linear-mode avalanche photodiodes as in-pixel demodulating detectors. Due to photocurrent gain modulation, avalanche photodiodes can combine optical sensing and light signal demodulation in a single device. The main advantage of the avalanche photodiode …
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Communication-Theoretic Foundations for Optical Receivers Using Dynamically Biased Avalanche Photodiodes
… (leading to high sensitivity) to reduce cost. Avalanche photodiodes (APDs) are commonly used photodetectors in many high-speed optical receivers due to their internal optoelectronic gain, which allows the photogenerated current to dominate the thermal noise without the need for optical …
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The Security of Self-Differencing Avalanche Photodiodes for Quantum Key Distribution
… hacked are the single-photon detectors, often avalanche photodiodes (APDs), as they are directly exposed to the optical channel. Whilst measurement-device-independent QKD removes detector vulnerability from the system, secure key rates with this technique can be much lower than point-to-point …
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Single-photon avalanche photodiodes for quantum communication applications in the near-infrared
… research undertaken on InGaAs-InP single-photon avalanche photodiodes (SPADs) intended for use in near-infrared (NIR) applications, such as light detection and ranging (LIDAR) and quantum key distribution (QKD) systems. Within the work, the effect of the lateral dimensions of the detector’s anode …
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Liquid Phase Epitaxial Indium-Gallium-Arsenide - Phosphide Avalanche Photodiodes for Near-Infrared Detection
… fabrication and characterization of InGaAsP/InP avalanche photodiodes for near-infrared detection is described in detail. Particular material requirements which must be satisfied for these devices are considered and the special techniques involved in the use of liquid phase epitaxy which have …
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Modeling and engineering impact ionization in avalanche photodiodes for near and mid infrared applications
Avalanche photodiodes (APDs) are the preferred photodetector in many applications in which low light levels need to be detected. The reason why APDs are important in such applications is due to their internal gain, which improves the APD's sensitivity. Compared to receivers based on PIN …
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Development of high-performance front-illumination III-N avalanche photodiodes by metalorganic chemical vapor deposition
Gallium nitride (GaN) avalanche photodiodes (APDs) having large direct band-gap energy of ~3.5 eV at 300K can exhibit a high sensitivity in the ultraviolet (UV). They are appropriate candidates for many applications because of their capability of operation in the near-UV and visible-blind spectral …
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Development of an Optical System for Measuring Fluorescence Lifetimes
… other light detection devices, such as other avalanche photodiodes (APD) or photomultiplier tubes (PMTs).
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Current profile measurements using MSE on Alcator C-Mod
… of photomultiplier tubes (PMT's) with avalanche photodiodes (APD's) which enhanced the quantum efficiency; installation of a wire-grid polarizer to verify small Faraday rotation in the diagnostic; installation of steep edge filters to minimize pollution by the thermal Balmer-alpha …
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Measurement of double longitudinal asymmetries, A_{LL}, for pi0 production in polarized pp scattering at low Bjorken-x
… resulting from direct energy deposits in the Avalanche Photodiodes (APDs) which are reading the light from the MPC PbWO4 crystals. Using new scaler boards developed by Lawrence Berkley Laboratory, methods to determine relative luminosities were further refined resulting in systematic errors …
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Performance characterization of functional fiber detectors: scintillating fibers with embedded photodiodes
… innovative concept involves the integration of avalanche photodiodes within scintillating fibers, thereby engendering a detector that is not only lightweight and flexible, but also remarkably affordable. The foundation of this methodology revolves around the utilization of a convergent thermal …
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CMOS nanofluidics
… is demonstrated. We then incorporate avalanche photodiodes (APD) in CMOS. Additionally, a packaging method is introduced to work with CMOS chips with size of a few square millimeters. With components mentioned above, clinical applications, such as gene mapping for virus identification …
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Linear Mode CMOS Compatible p-n Junction Avalanche Photodiode for Smart-lighting Applications
… incorporates integrated waveguide detectors and avalanche photodiodes (APDs). This thesis focuses on the APD design and fabrication component of the sensing capability required by smart-lighting systems. Silicon CMOS compatible APDs are expected to provide high-speed and high-sensitivity sensors …
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Development of 1GHz Clocked Entangled LEDs for Fibre Networks
… detectors are replaced by self-differencing avalanche photodiodes which have been used in quantum key distribution systems, with an entanglement fidelity of 71% achieved. In the source system, the free space spectral filter which required precise alignment is replaced by a fibre-based …
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Spectral dynamics of single quantum dots : a study using photon-correlation Fourier spectroscopy for submillisecond time resolution at low temperature and in solution
… where the two outputs are detected with avalanche photodiodes and cross-correlated with a hardware autocorrelator card. The interferometer maps spectral changes into intensity changes which can be measured with high temporal resolution by the autocorrelator. The distribution of spectral …
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Integrated optical quantum manipulation and measurement of trapped ions
… simple single-layer traps, and that CMOS silicon avalanche photodiodes may be employed for scalable quantum state readout. Finally we show initial results on integrated electro-optic modulators for visible light. These results open possibilities for experiments with trapped ions in the short term, …
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Optical quantum random number generation: applications of single-photon event timing
… detectors used for both QRNGs are single-photon avalanche photodiodes (SPADs), devices which when operated below their breakdown voltage can create a macroscopic amount of current (an avalanche) in response to a single incident photon. Some of this charge can become trapped in defects or …
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Transmission Capacity Improvement for Single Photon Avalanche Diode-based Optical Communication Using PAM Modulation
… links due to the use of single photon avalanche diode (SPAD) optical receivers. Currently, for non-optically amplified optical communication links that use intensity modulation with direct detection, the highest optical sensitivity is achieved using avalanche photodiodes. However, the …
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