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 70 for “"mid-IR"”.
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Semiconductor quantum dots for mid-IR light emission
Mid-infrared wavelength range (3 μm to 30 μm) is important in many applications such as environmental monitoring, industrial process control, bio- medical imaging, security and defense. The mid-IR is the spectral home of the distinct vibrational and rotational absorption resonance signatures of a …
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Design of high efficiency Mid IR QCL lasers
… research is a study of designing high-efficiency Mid-IR quantum cascade lasers (QCL). This thesis explores "injector-less" designs for achieving lower voltage defects and improving wall plug efficiencies through highly strain-balanced structures and minimized injector regions. This work contains …
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Mid-IR type-II InAs/GaSb nanoscale superlattice sensors
The detection of mid-wavelength infrared radiation (MWIR) is very important for many military, industrial and biomedical applications. Present-day commercially available uncooled IR sensors operating in MWIR region (2-5μm) use microbolometric detectors which are inherently slow. Available photon …
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Shock Tube and Mid-IR Laser Absorption Study of Combustion Kinetics
… fuels. Specifically, a shock tube and direct laser absorption systems are used to investigate the ignition and pyrolysis processes of target fuels. The research problem is motivated by concern about climate change and diminishing fossil fuels. There is a need to develop advanced …
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Far-UV to Mid-IR Spectral Energy Distributions of Nearby Merging Galaxies
… an AGN and re-radiate that energy at infrared (IR) wavelengths. Therefore, quantifying the amount of buried AGN activity in the IR is key to understanding the role of major mergers in galaxy evolution. Spectral energy distributions (SEDs) allow Astrophysicists to disentangle AGN activity from …
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Mid-IR Imaging and Multivariate Analysis of Dynamic Processes in Pharmaceutically Relevant Microparticles
… must be well characterized in terms of their size range, morphology and function. It is widely understood that the chemistry and morphology of microparticles have a degree of interdependence which strongly affects drug release behaviour from microparticles. This thesis investigates, for the …
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Mid-IR plasmon-mediated photoluminescence from gallium-doped zinc oxide bow-tie nanoantennas
Semiconductor devices that interact with mid-infrared (mid-IR) wavelengths have a variety of applications in communications, sensing, and defense. However, most mid-IR sources, particularly incoherent emitters, are practically limited as a result of significant non-radiative losses. One proposed …
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Structural Investigations of Nematode Anhydrobiotic and Rab11-FIP Proteins by Far-UV Circular Dichroism and Mid-IR Fourier Transform Infra-Red Spectroscopy
… less so for estimating b-sheet. Conversely, FTIR spectroscopic analysis of the same proteins proved to be more accurate for b-sheet estimation than either a-helix or random coil. Overall, CD spectroscopy was found to be superior to FTIR spectroscopy for the quantitative analysis of protein …
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Two-photon absorption in bulk semiconductors and quantum well structures and its applications
… applications of two-photon absorption (2PA), in direct-gap semiconductors and quantum-well (QW) semiconductor structures. One application uses extremely nondegenerate (END) 2PA, for mid-infrared (mid-IR) detection in uncooled semiconductors. The use of END, where the two photons have very …
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Chalcogenide glass materials for integrated infrared photonics
… to synthesize in bulk and thin film forms and their compositional flexibility allows tuning of optical properties such as refractive index making them ideal for infrared photonics. We have studied the material attenuation in ChGs that arises due to the presence of impurities in the raw materials …
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Integrated narrowband guided mode resonance photonic filters for advanced mid-infrared microspectroscopy
… molecular vibrational absorption wavelengths in mid-infrared (mid-IR) have been discovered for various applications, and as a result, a faster summary of an MIR spectrum can be gained by probing a set of discrete spectral fingerprints only, enabling many applications including fast early cancer …
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Low-Temperature Germanium Waveguides for Mid-Infrared Sensing Applications
Waveguide integrated devices that operate in the mid-infrared (mid-IR) wavelength range (2.5-12 µm) are used for sensing the fundamental absorption bands in a variety of molecules. Germanium (Ge) is commonly used for photodetection in the nearinfrared (near-IR) wavelength range of 1.2-1.6 µm due to …
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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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SPECTROSCOPIC STUDY OF ICES WITH ASTROPHYSICAL INTEREST
… Surface Science Laboratory. I have studied the mid-infrared (Mid-IR) bands of thin films of pure CH4 ices and of CH4 ices mixed with N2 and H2O in order to characterize the thermal evolution of ices in confined geometry and to improve the understanding of observations of ices present in …
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High-resolution studies of protoplanetary disks
… work presents a multi-wavelength search (near-IR, mid-IR, mm) for previously unknown circumstellar disks and a study of those disk candidate objects which are not yet well characterised in the literature. 22 candidate stars, most of these constituting known exoplanet systems, were examined for …
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Predictive simulation and design of III-V heterostructures for light emission and detection
… technologies. In this Thesis we employ both first-principles and continuum empirical - based respectively on density functional theory (DFT) and the k·p method – calculations to analyse and optimise III-V semiconductor heterostructures for light emission and detection. III-V superlattices …
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High harmonic generation and attosecond dynamics in small organic molecules and biomolecules
… Traditionally, describing such interactions requires the solution of the time-dependent Schr\"{o}dinger equation, but this approach is only feasible for the smallest molecular systems. An alternative approach is to use time-dependent density functional theory (TDDFT). In this thesis we report on …
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Membrane investigations using infra-red spectroscopy and multivariate target factor analysis
Mid Infrared spectroscopy coupled with multivariate Target Factor Analysis (TFA) was used to investigate permeation and localisation of drugs through and within synthetic membranes and human skin. Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy was used for the …
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Resonant-cavity-enhanced multispectral infrared photodetectors for monolithic integration on silicon
Multispectral infrared (IR) detection has been widely employed for numerous applications including hyperspectral imaging, IR spectroscopy, and target identification. Traditional multispectral detection technology is based on the combination of broadband focal plane arrays (FPA) and spectral …
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Ultrasensitive CMOS-compatible lab-on-a-chip integrated photonic sensors with wideband operation
… and silicon carbide (SiC) since they provide desired properties, such as a wide transparency window, a medium refractive index, and compatibility with standard complementary metal-oxide-semiconductor (CMOS) fabrication processes. Most importantly, SiC shows biocompatibility for enabling …
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