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.
Results
Showing 1 to 16 of 16 for “"photo-detector"”.
-
Front-end circuits for a photonic analog-to-digital converter
… clock jitter, low-jitter mode-lock laser based photonic ADCs are starting to gain more attention. As well as low-jitter and high-linearity operation at very high speeds, photonic ADCs provide the opportunity to de-multiplex electrical signals to enable the parallel sampling of signals which …
-
Intensity stabilization of a solid-state laser for interferometric gravitational wave detectors
A high-power, low noise photo-detector, in conjunction with a current shunt actuator has been used in an AC-coupled servo to stabilize the intensity of a 10 Watt continuous-wave Nd:YAG laser. A relative intensity noise of 1 x 10⁻⁸ [square root] Hz at 10 Hz has been achieved.
-
Exploration of 3D Nanoscale Image Sensor to Enable Logic and Sensing in Single Chip
Nanowire photodetectors have been attracting and gained increased attention due to their potential for very high sensitivity detection. Silicon photodetectors are of particular interest due to their low cost, ease of processing and ability for integration with conventional fabrication techniques. …
-
Third Harmonic Generation as a Probe of Ultrafast Phase Transitions
… the design and operation of a deferential photo detector as well as the first quantitative measurements of the thermal conductance of metal-metal interfaces. The room temperature interface conductance of the as-prepared Al-Cu interface is 4 GW M -2 K-1, and the interface conductance …
-
Thin film integrated optical waveguides for biosensing using local evanescent field detection
… field scanning optical microscopy or a silicon photo detector array. The fabrication and characterization of a waveguide device with a coupled light source was accomplished. The evanescent field response to thin films of patterned photoresist was found using NSOM. Light intensity measured at the …
-
Wide-Dynamic-Range Continuous-Time Delta-Sigma A/D Converter for Low-Power Energy Scavenging Applications
… sensors and A/D converter systems. For most photo-detector-based applications, the input-current is integrated onto a capacitor, either with a variable time, or a variable capacitor value, followed by a sample-and-hold and a voltage A/D converter. The penalty for achieving wide-dynamic-range …
-
R&D of a High-Performance DIRC Detector For a Future Electron-Ion Collider
… over $1 billion in design and construction. Each detector concept for the electron/ion beam interaction point is integrated into a large solenoidal magnet. The necessity for excellent hadronic particle identification (pion/kaon/proton) in the barrel region of the solenoid has pushed research and …
-
Optimization of charge collection efficiency in MSM photodetector
… 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 propagates from the constricted grating region to a larger crosssection in the active region have …
-
MULTIPHOTON ABSORPTION IN MONOLAYER TRANSITION METAL DICHALCOGENIDES
… importance to next-generation, infrared photo-detection. In this thesis, degenerate two-photon absorption (2PA) and three-photon absorption (3PA) with two-dimensional (2D) excitonic effects are studied in single-layer molybdenum disulfide (1L-MoS2). Both 2PA and 3PA coefficients of …
-
Measurement of two-dimensional concentration fields of a glycol-based tracer aerosol using laser light sheet illumination and microcomputer video image acquisition and processing
… projected through the aerosol onto a photo detector, are used to calibrate the captured video linages to detennine actual concentration values. Accuracy, reproducibility, and maximum rate of data acquisition are evaluated by means of theoretical models of ambient air flow in a sealed …
-
Novel design for foot pressure measurement using opto-electronics in rehabilitation
… consisting of an infra-red emitting diode and a photo-detector is placed inside the mechanical device. The emitter diode emits 940 nm infra-red rays and strikes on a reflective surface where the compressive loading changes the refractive angle and the path length of the transmitted light, thereby …
-
Adaptation of VT-Dbr Lasers for LIDAR
… current magnitude. In this reverse biased photo-detector mode the laser exhibited narrower linewidth less than 15MHz, with the linewidth at intrinsically narrow levels when all three sections reverse biased. Also promising was a subset of reverse bias conditions that only used a variable …
-
Investigation of fontanelle photoplethysmographs and oxygen saturations in intensive care neonates and infants utilising miniature photometric sensors
… of light in varying amounts and is detected by a photo-detector as a photoplethysmograph (PPG). The spectral information received is then processed electronically and digitally to determine the amount of haemoglobin present. In the sickest of children blood supply can become compromised to these …
-
Stellar interferometry - detectors and the atmosphere.
… innovation in a number of areas including photo-detector design. The first intention was to specify the best detector and the optimal operating wavelength for COAST. This was done by considering the signal-to-noise ratio in fringe visibility modulus measurements with various detectors. The …
-
Measuring Nonlinear Properties of Graphene Thin Films Using Z-Scan Technique
… through the material, was recorded using a photo detector in the far field. In this dissertation work, the beta-barium borate (BBO) crystal was chosen as an excellent candidate to calibrate and test the accuracy of the built Z-scan system and to investigate the thermal nonlinearities, which …
-
Functional Oxides in Optical and Electronic Applications by Atmospheric Pressure Spatial Chemical Vapour Deposition
… other potential applications in gas sensing, photocatalysis, smart windows, water splitting and etc. However, WO3 does suffer from a diverse of phases and states, making it hard to control electronic conductivity, and variable oxygen and cation valence states for RRAM application. Furthermore, …