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 44 for “"Infrared detectors."”.
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Wafer Level Characterization of Infrared Detectors
… wafer level fabrication process for these detectors. A recent DARPA program called Wafer level Infrared Detectors (WIRED) is exploring new integration schemes for developing low cost photonic detectors, which have higher speed and sensitivity compared to thermal detectors. Such efforts will …
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Antimony-based type-II superlattice infrared detectors
… applications within the mid- and long-wavelength infrared are driving the search for efficient and cost effective detection technologies in this regime. Theoretical calculations have predicted high performance for InAs/GaSb type-II superlattice structures, which rely on mature growth of III-V …
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Iii-V Multiple Quantum Well Long-Wavelength Infrared Detectors
… sensitive, low-cost, large long wavelength infrared focal-plane arrays.
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Aluminum nitride microelectromechanical infrared detectors with integrated metamaterial absorbers
… development of uncooled spectrally selective mid-infrared (IR) detectors based on the seamless integration of metamaterial (MM) structures with microelectromechanical (MEMS) AlN resonators. Historically, uncooled absorbers have been limited in two key metrics: selectivity, the ability to …
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Infrared detectors based on two-dimensional materials and heterostructures
… interaction phenomena and developing advanced infrared detection technologies enabled by 2D materials and their heterostructures. First, we addressed some of the key challenges for reliable synthesis and characterization of 2D materials and functional nanostructures. We developed a new …
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Investigation of Infrared Detectors Based on the Gallium-free Superlattice
Infrared detection has proven to be an essential capability in a variety of fields, primarily the medical and defense fields. The current industry standard material is HgCdTe, which has been developing since its inception in the late 1950s. SLS materials are created from very thin layers, on the …
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InAs/Ga(In)Sb superlattice based infrared detectors using nBn design
Infrared detectors in the mid-wave infrared (MWIR) (3-5μm) and long-wave infrared (LWIR) (8-12μm) have many applications in military, industrial and medical fields. The state-of-the-art photodetectors based on Hg1-xCdxTe (MCT) have large signal over noise ratio and their bandgap can be tuned to …
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Longwave and bi-color type-II InAs/(In)GaSb superlattice infrared detectors
Infrared (IR) photodetectors are useful for a variety of military and civil applications such as target acquisition, medical diagnostics, pollution monitoring, to name just a few. Presently photonic IR detectors are based on interband transitions in low bandgap semiconductors such as mercury …
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Characterization of gold black and its application in un-cooled infrared detectors
… electron microscopy, Fourier transform infrared spectroscopy, and fore-probe electrical measurements. A significant decrease in electrical resistance in as deposited coating was found to be consistent with changes in the granular structure with aging at room temperature. Electrical …
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Novel etch studies and passivation techniques on InAs/GaSb superlattice based infrared detectors
Infrared (IR) detectors today are being utilized for a variety of imaging applications such as medical diagnostics, navigation instruments of automobiles and aircrafts, meteorological imaging, night-vision and fog/smoke imaging, surveillance, target acquisition and astronomical/space imaging. These …
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Long wavelength infrared detectors utilizing multiple quantum wells in III-V compound semiconductors
Data are presented on various infrared detectors based on multiple GaAs/AlGaAs quantum wells. Due to the great flexibility in the growth, dimensions, and composition of these structures, the electrical and optical characteristics of the photodetector may be significantly altered. This investigation …
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Development of microcantilever mid-infrared detectors and sources and their application in infrared spectroscopy
Mid-infrared (mid-IR) light is an electromagnetic radiation with the wavelengths of 3 – 30 um. This spectral range includes the dominant wavelengths of the thermal radiation emitted by objects at or near room temperature, and vibrational and rotational resonance frequencies of many molecules. The …
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Mid-Wave and Long-Wave Single Uni-polar Barrier Infrared Detectors Based on Antimonide Material Systems
Infrared detectors are very important technological tools for many different applications. Infrared detectors have existed as far back as the late 1700s but received a tremendous push 200 years later during World War II. Both thermal and photon based infrared detectors have had significant …
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New pyroelectric phenomena from graded ferroelectric barium strontium titanate thin films
… thin films in uncooled pyroelectric detectors. We built a magnetron sputter system, and developed a method of deposited compositional graded ferroelectric thin films using rf magnetron sputtering, a silicon compatible thin film fabrication process. By obtaining giant effective …
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Diffusion characterization of antimony-based type-II superlattices using electron beam induced current and time-resolved photoluminescence
The infrared wavelength range is of vital importance for thermal imaging, molecular sensing, astronomy, and a variety of other health, medicine, and security and defense applications. Infrared detectors, capable of light detection in this vital wavelength range are thus of significant technological …
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Handheld infrared camera use for suicide bomb detection: feasibility of use for thermal model comparison
… as a tool for detecting hidden weapons is an infrared detector. Infrared detectors are passive sensors that create infrared, or thermal, images without having to expose the subject to any radiation. These images show the heat signature that is given off by objects of interest. Previous studies …
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Study of quantum dot and quantum well photodetectors
A study of quantum dots-in-well infrared photodetectors (QDIPs) yields results useful for the creation of a two-colour QDIP. Quantum dot infrared photodetectors (QDIPs) have been shown to be a key technology in mid and long wavelength infrared detection due to their potential for normal incidence …
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Optical characterization of compound semiconductors using photoconductivity and photoreflectance
… for the growth of Hg1--xCdxTe which is used in infrared detectors. Photoreflectance spectroscopy, capable of accurate estimations of energy levels in semiconductors, was applied to determine composition in CdZnTe standards via band gap energy determinations. The excitonic contributions at room …
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Growth of CdTe/ CdZnTe single crystals by the vertical gradient freezing method
… materials for the development of x-ray and y-ray detectors. They can also be used as substrates for the epitaxial growth of HgCdTe, which is a key material for far-infrared detectors with high resolution and large detection area. Currently, there are no mature techniques to grow CdTe/CdZnTe single …
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MULTICOLOR INFRARED DETECTION USING STEP QUANTUM WELLS
Quantum well infrared photodetectors (QWIPs) based on intersubband transitions are widely investigated in recent years. Due to the mature III-V material and processing technology, great progress has been made successfully for the fabrication of large scale quantum well infrared focal plane arrays …
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