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 24 for “"Dichroic"”.
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Sputtering fabrication of silicon nitride and silicon oxide based dichroic mirrors
… absorption and reflectance at wavelengths. Dichroic mirrors exhibit very different reflectance and transmission rates at certain cut-off wavelengths, which can be adjusted using changes in layer materials and thickness. This is due to constructive optical interference between alternating …
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Ring Resonators Intergrating With Dichoric Materials And In Spin-valley Controlled Photonic Topological System
… (MO) materials, yielding a substantial dichroic response within specific wavelength ranges. However, the reliance on external magnetic fields and the use of MO materials present challenges for miniaturization and fabrication in Complementary metal–oxide–semiconductor (CMOS) process. …
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Surface trap for ytterbium ions
… lasers locked to an atomic reference using the Dichroic Atomic Vapor Laser Lock technique. We used photoionization from the Yb magneto-optical trap located within the region of the ion trapping potential.
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Interactions of disruptive materials with phospholipid bilayers
… with both leaflets in the bilayer. We report dichroic ratios measured from each bilayer composition with ATR-FTIR. The methylene dichroic ratios in all bilayers decrease with introduction of both SM and Chol, but the magnitude of decrease is greater in the presence of SM. A decrease in …
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Near infrared absorption by SH<sup>-</sup> in alkali halides
… was found to increase with an increase in E. The dichroic results were found to be inconsistent with simple classical models which use Boltzmann statistics to predict the numbers of molecules lying along potential minima directions. Better agreement between experiment and theory was found when the …
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Process modifications for improved optical characteristics of K-type polarizer
… light at the outer visible wavelengths by adding dichroic dyes to correct the blue (400-450 nm range) or red leakage (620-660 nm). This project covers experimentation to determine the value of these process additions and to further the understanding of the new mechanisms and the improvements they …
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Dielectric and electro-optical properties of some cyanobiphenyl liquid-crystals
… in thin layers of some alkyl cyanobiphenyls. Dichroic ratio R and order parameters of solutions containing some azo and anthraquinone dyes in the nematic solvent (E7 and E8), were investigated by the measurement of the intensity of the absorption bands in the visible region of parallel aligned …
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Optical signal generation, stabilization, and manipulation in broadband silicon photonics
… and demonstrate the first on-chip transmissive dichroic filter with the sharpest roll-offs to date. Finally, directional coupler based solutions are studied to address wavelength selectivity for octave-wide signals, and propose designs for ultra-wideband couplers.
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Remote three-dimensional temperature sensing using planar laser induced fluorescence : development and applications to microwave heated liquids
… a 2D x-y plane at a specified z-axis position. A dichroic mirror and optical filters were used to separate the fluorescence signals from the two probes. The instrument was able to achieve a spatial resolution of 0.2 mm in x-y plane, a 5 mm spatial resolution in z-axis, and a temperature resolution …
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X-Ray scattering investigations of subtle ordering in correlated materials
… BSCCO. Azimuthal rotations reveal the circular dichroic signal the result of linear bleed through. Polar rotations suggest that the previous reports were likely caused by misalignment.
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Organic materials with acenoid and iptycene structures
… nematic LC hosts, indicating their potential as dichroic dyes for guest-host liquid crystal displays. In addition, the sensitivity of emission to the substitution allows the tuning of emission by functionalization of the acenequinone chromophore. Chapter 2. The synthesis of a series of fluorine- …
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Vibrational Spectroscopy and Atomic Force Microscopy Studies of Silane Adsorption onto Silicon and Glass.
… FTIR-ATR experiments to determine the relative dichroic ratios of cast and self-assembled films on silicon, and these results were compared with a theoretical model. The conclusion was that the cast silane layers were orientationally disordered, whilst the self-assembled layers showed a greater …
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Uv-Visible Microscope Spectrophotometric Polarization And Dichroism With Increased Discrimination Power In Forensic Analysis
… molecular fluorescence reference materials, and dichroic reference materials. Upon completion of these standard slide preparations analysis began with measurements in order to evaluate figures of merit for comparison of the instruments investigated. The figures of merit investigated included: 1) …
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Chemical and enzymatic modification of whey proteins
… various degrees as evidenced by their circular dichroic profiles. Interactions of the modified proteins with other proteins, lipids and mineral ions were compared to those of the native whey protein. Interaction of the modified proteins with gluten took place by two different mechanisms, namely, …
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Engineering the optical properties of luminescent solar concentrators at the molecular scale
… we leveraged the anisotropic emission pattern of dichroic dye molecules. We aligned their dipole moments normal to the face of the waveguide by embedding them in a liquid crystal host. Vertical dye alignment increased the fraction of the power emitted below the critical angle of the waveguide, …
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Polarimetric Characterization Of Random Electromagnetic Beams And Applications
… shape, orientation, birefringent or dichroic properties of the particles. Various scattering regimes and different geometries are discussed for applications relevant to the biomedical field, material science, and remote sensing. The analysis is intended to elucidate practical aspects …
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A photoemission study of quasiparticle excitations, electron-correlation effects and magnetization dynamics in thin magnetic systems
… part, a time-resolved x-ray magnetic circular dichroic-photoelectron emission microscopy study of a permalloy platelet comprising three cross-tie domain walls is presented. It is shown how a fast picosecond magnetic response in the precessional motion of the magnetization can be induced by …
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Optically active photoresponsive multifunctional polymeric materials
… systems (optical activity, exciton splitting of dichroic absorptions), as well as the features typical of photochromic materials (photorefractivity, photoresponsiveness, NLO properties). The first part of this research was to synthesize analogue homopolymers and copolymers based on bisazoaromatic …
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On the phenomenon and potential applications of pulsed laser-reshaped silver nanoparticles embedded in soda-lime glass
… to form prolate spheroids, which results in a dichroic effect on the composite as a whole, caused by the anisotropic SPR band shift.<br/><br/>It is also shown that changing the laser polarisation from linear to radial and/or azimuthal changes the character of the reshaped nanoparticles. It was …
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Materials and design strategies for solar microcells
… discussed. Optical elements such as prisms and dichroic mirrors have previously been employed in spectrum splitting designs. Working with micro-scale solar cells, chromatic aberration can be used to spectrally split the sunlight. In the last part of my thesis, optical modeling results for a …
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