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 29 for “"Infrared range"”.
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Electronic structure and optical properties of sb-based self-assembled quantum dots for the mid-infrared range
… for the MIR 3-5 μm (0.25-0.40 eV) emission range when type-I band alignment is possible. This leads to the investigation of type-II broken gap InAsxSb(1-x)/InAs SAQDs.Finally, the optical properties of the InSb-based SAQDs are investigated by means of the photoluminescence (PL) measurement …
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Nanoporous glass-ceramics transparent in infrared range to be used as optical sensor-Mechanical and viscoelastic properties of the TAS (Te-As-Se) glass
… affect the optical transmission of these infrared transparent glass-ceramics. These materials can therefore be used for the design of optical elements and an ATR (Attenuated Total Reflections) plate with nanoporous surface was fabricated and tested as an optical infrared sensor. The porous …
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Odor mapping in neuroscience and design
… digital smell using frequencies in the infrared range produced by vibrations and the general public's perceptions of these products. The results show that the technology is not readily accepted by users at the present time.
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Fatigue Monitoring System
… A web camera was adjusted to work in near infrared range and a system of 880 nm IR diodes was implemented to create an IR vision system to localize and track the eye pupils. The software developed monitors and tracks eyes for signs of fatigue by measuring PERCLOS. The software developed …
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Radiative properties of silicon related materials
… of silicon, as a function of temperature, in the infrared range of wavelengths. The wavelength range, considered in this study, is between 1 micron and 20 microns. The temperature range observed is from 50 degrees Celsius to 1000 degrees Celsius. Varying wafer thickness and doping are taken into …
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Optical Behavior of Ion Implanted Polymers
… wavelengths, particulary in the near ultraviolet range. The near infrared range was the least affected by implantation. A Drude-Lorentz scattering model in which short carbon chains formed during implantation are largely responsible for the changes in optical behavior can best explain the effects. …
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Optically Pumped Type-II Mid-Infrared Tunable Distributed Feedback Lasers
Optically-pumped type-II mid-infrared index-coupled tunable distributed feed- back (DFB) semiconductor lasers have been developed to provide continuous-wave (CW) single longitudinal mode (SLM) operation with features including narrow spec- tral linewidth, high output power, good beam quality and …
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Characterization of mid-infrared quantum cascade lasers
… output powers available for light in the mid-infrared range (from 3 to 8 m). As many of their applications require portability, designs that have a high wall-plug efficiency are essential, and were designed and grown by others to achieve this goal. However, because a large fraction of these …
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Infrared Spectroscopic Measurement of Titanium Dioxide Nanoparticle Shallow Trap State Energies
Within the "forbidden" range of electron energies between the valence and conduction bands of titanium dioxide, crystal lattice irregularities lead to the formation of electron trapping sites. These sites are known as shallow trap states, where "shallow" refers to the close energy proximity of …
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Optical properties of black silicon - an analysis
… has a reflectance of about 30% in the visible range of wavelengths. Standard Silicon solar cells are not entirely useful in the infrared spectrum region. In order to enhance the performance of Silicon solar cells, reflectance losses must be minimized and absorption must be maximized. In the …
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Efficient ranging-sensor navigation methods for indoor aircraft
… for indoor navigation, including sonar, infrared range sensors, and a scanning laser rangefinder. Each type of range sensor tested has its own unique characteristics and contributes in a slightly different way to effectively eliminate the dependence on GPS. The use of low-cost range …
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Time-domain diffuse correlation spectroscopy: instrument prototype, preliminary measurements, and theoretical modeling
Near-infrared spectroscopy (NIRS) is an emerging diffuse optical imaging tool with both clinical and academic applications such as functional brain imaging, breast cancer detection, and cerebral health monitoring. Due to its non-invasiveness, high spatial and temporal resolution, and portability, …
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Integrated infrared sensor platform
Infrared spectrum, especially mid-infrared range (2.512tm) covers the absorption peaks of many important chemicals including carbon monoxide, methane and water vapor. By analyzing the absorption spectrum of achemical, one can measure the concentration of the chemicals as well as distinguish the …
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Studies on Optically Induced DC-Voltage in Thin Film Structures
… bandgap. This traditional approach limits the range of wavelengths that can be detected, it is not sensitive to polarization, and loses accuracy in the infrared range because of thermal noise. In order to design and optimize a photodetector that can overcome those limitations, I first built an …
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Doped tungsten oxide nanocrystals for next generation electrochromic windows
… absorption in the shorter wavelength near-infrared range, which can directly affect the major electrochromic performance of switching speed, optical modulation, and cycling stability. This work illustrates how doped WO₃ [subscript -x] NC properties are effectively utilized for enhancing the …
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Graphene, layered materials and hybrid structures for advanced photodetectors
… achieved with germanium. I then target the mid-infrared range ($\lambda\sim$10$\mu$m), where emission from objects at room temperature has a peak. I show graphene-based pyroelectric bolometers with temperature coefficient of resistance up to 900\%/K, two orders of magnitude higher compared to …
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Reconstruction Methods for Optical Molecular Tomography
… surface of a small animal around the visible and infrared range. This approach can facilitate or enable preclinical applications such as cancer studies, involving angiogenesis, tumor growth, cell motility, metastasis, and interaction with a micro-environment. The reconstruction of diffuse light …
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Plasmonic Nanoshells: Synthesis, Functionalization, and Photonic Applications
… at wavelengths from the visible to the near-infrared. Initial studies utilizing these nanoshell cores included coating the particles with porous silica, a protective layer that reduces aggregation but does not prevent access to the core by ions in solution. In addition, the silica coating …
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Si-based Germanium Tin Photodetectors for Short-Wave and Mid-Wave Infrared Detections
… and inexpensive imaging system working in the infrared range keeps increasing for the last decade, especially for civil applications. Although several group IV materials such as silicon and germanium are used to realize detectors in the visible and near infrared region, they are not the …
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Advanced high-power optical parametric oscillators synchronously pumped by ultrafast fibre-based sources
… which are the highest reported to date. Tuning ranges from 1.4µm to 1.7µm (signal) and from 2.8µm to 4.4µm (idler) are typical for both OPOs. Including frequency-doubling of the 1060 nm light, the first pump source, operating at 230MHz and 20ps, is used for two green-pumped OPOs tunable in the …
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