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 10 of 10 for “"noise equivalent power."”.
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Terahertz photomixing spectroscopy of two-dimensional semiconductor plasmons
… in sensitivity and currently exhibit a noise equivalent power of 10^-8 W/sqrt(Hz) However, further improvements are essential for these detectors to become truly useful; the ultimate goal being a NEP < 10^-10 W/sqrt(Hz) To this end, it is necessary to understand the physical properties …
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Thermal detection in the long wave infrared and very long wave infrared regions
… higher speed and detectivity, as well as lower noise. Thermal detection in the far wave infrared region (Terahertz) remains underdeveloped, opening a door for new innovative technologies such as metamaterials. This thesis will present the design and measurements of silicon photonic microring …
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Terahertz imaging and quantum cascade laser based devices
… or enhanced speed at the expense of signal to noise ratio (SNR). In this thesis, a system for real-time imaging is demonstrated using recently developed terahertz quantum-cascade laser (QCL) sources, along with commercial, focal plane array thermal detectors. The system uses a high power (48 …
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Dilute Nitride Based Vertical Cavity Enhanced Photodetector
… equates to a trade-off between speed, bandwidth, noise-equivalent-power, and detectivity. A GaInNAs/GaAs VCE photodetector with an internal gain of 1.55 for room temperature operation at 1.3µm wavelength is next demonstrated. This is the first internal gain ever reported using a GaInNAs VCE …
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Graphene Field-Effect Transistors on p-doped Semiconductors for Photodetection
… in photodetection, characterized by low noise, broad-spectrum response, high responsivity, and fast response [46, 126]. These photodetectors utilize graphene as the active channel, with graphene deposited on an insulating layer and semiconductor substrate. The contact of graphene with an …
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CMOS Terahertz Sensors and Circuits for Imaging Applications
… sensor, with a broadband high responsivity, low noise equivalent power, and capable of working at room temperature is still a challenge. Moreover, sensor integration with signal processing electronics is required in order to realize compact systems to be used in commercial imaging applications. …
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Technologies for Room-Temperature Mid-Infrared Photodetection using Graphene
… and architectures with resilience to thermal noise and infrared-transparent optical materials with minimal vibrational absorption, restricting the mid-infrared material toolbox. 2D materials, which promise to combine high crystallinity with inexpensive and low-temperature processing paradigms, …
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Transition Edge Sensors for Far-Infrared Space Science
… with many thousands of detectors having Noise Equivalent Power (NEP) of only 10^{-19} WHz^{-1/2}. However, very few TES arrays have so far been developed for these wavelengths, ∼30-200 μm, characterised by an NEP two orders of magnitude lower than necessary in TESs for ground-based …
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THz Radiation Detection Based on CMOS Technology
… as the non-ionizing nature, since the associated power is low and therefore it is considered as safe technology in many applications. THz waves have the capability of penetrating through several materials such as plastics, paper, and wood. Moreover, it provides a higher resolution compared to …
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Physics and Engineering of Photoelectric Tunable-step Terahertz Detectors Based on High Mobility III-V Semiconductor Structures
… THz detectors with high responsivity, low noise, fast response speed and room operating temperature are of paramount importance. Field effect transistors (FETs) based on two-dimensional electron gases (2DEGs) have shown promising performance as THz detectors over the past few decades. In …