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Showing 1 to 20 of 82 for “"Refractive indices"”.
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Digital Holographic Microscopy for Measurement of Cellular Refractive Indices
… the optical properties of transparent media. The refractive index of a transparent material is defined to be the fraction by which light slows down as it propagates through the medium. A digital holographic microscope (DHM) has been constructed to measure the refractive index of living biological …
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Refractometry by total reflection
Refractometry is a means to measure the refractive indices of liquids, gases, and dielectric solids, either isotropic or anisotropic, by observation of light refraction or reflection with a microscope, refractometer or other more specialized equipment. For anisotropic solids, refractometry by total …
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Influence of fluorine versus hydroxyl content on the optics of the amblygonite-montebrasite series
… containing significant sodium, 2V and principal refractive indices were determined to 0.5° and 0.0005, respectively, by spindle-stage methods. If F < 60 mole percent, as is true for the vast majority of natural specimens, fluorine can usually be estimated to within 2 mole percent from the …
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A study of the microstructure and optical properties of thin load- dielectric cermet films
… is used to obtain theoretical film refractive indices. The Maxwell Garnet theory provides a basis for the theoretical results. Measurements of film transmission and reflectivity are used to obtain rough experimental values for film refractive indices by the Tekucheva method. More …
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Chemical sensing applications of fiber optics
… of a fiber optic sensor to measure refractive indices of unknown solutions. The surface plasmon sensor, interrogated with white light resulted in attenuations of light at different wavelengths when solutions of different refractive indices were introduced. This sensor has been shown …
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Modeling Of Mouse Eye And Errors In Ocular Parameters Affecting Refractive State
… EYE AND ERRORS IN OCULAR PARAMETERS AFFECTING REFRACTIVE STATE</p> <p>by</p> <p>GURINDER BAWA</p> <p>September 2013</p> <p>Advisor: Dr. Ivan Avrutsky</p> <p>Major: Electrical Engineering</p> <p>Degree: Doctor of Philosophy</p> <p>Rodents eye are particularly used to study refractive error state …
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Photon Generation and Dissipation in Organic Light-Emitting Diodes
… multi-layer device structure and the mismatch of refractive indices. This thesis comprises different approaches for the efficiency enhancement of planar OLEDs. In particular, outcoupling strategies to extract trapped photons to obtain highly efficient OLEDs are investigated.
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Search for Soft Unclustered Energy Patterns at the Large Hadron Collider and studies of radiation damage in plastic scintillators
… samples exhibit internal regions with different refractive indices separated by a visible boundary. Measurements of the boundary depth indicate compatibility with the expected oxygen penetration depth during irradiation. The refractive indices of the internal regions are higher than those of the …
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Ultrafast dynamic ellipsometry of laser driven shock waves
… of the material and any change in its complex refractive index. Ultrafast dynamic ellipsometry was first used to ascertain the Hugoniot and the shocked refractive indices of thin polymer films of polycarbonate, poly(methyl methacrylate) (PMMA), poly(chlorotrifluoroethylene-co-vinylidene …
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Topics in Electromagnetic, Acoustic, and Potential Scattering Theory
… fiber optics, metamaterials with negative refractive indices, cloaking and invisibility, the topic of time-independent scattering theory in quantum mechanics is becoming a useful field to re-examine in the above contexts. One of the key areas of electromagnetic theory scattering of plane …
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Fabrication of Random Hole Optical Fiber Preforms by Silica Sol-Gel Processing
… polymer sheath. The finely tuned difference in refractive indices, for step index-fibers, is achieved by doping the core with germanium or elements with similar effects. Holey fibers (including photonic crystal fibers) comprise of a pure silica core, and a pure but porous silica cladding of air …
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Pegmatitic muscovites: effect of composition on optical and lattice parameters
… parameters. The results of this study indicate refractive indices increase to the extent Fe and Ti constitute the octahedral cations, and to the extent OH rather than F coordinates to these cations. The optic angle 2VX decreases nearly linearly with the Ti content. The b cell edge follows a …
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Subwavelength antireflection and polarization grating elements: Analysis and fabrication
… as homogeneous thin film layers of equivalent refractive indices. The equivalent refractive indices depend on grating characteristics, angle of incidence, and incident light polarization. These gratings can be used as equivalent anti-reflection coatings and as polarization elements. Since the …
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Optical and thermal characteristics of thin polymer and polhedral oligomeric silsesquioxane (POSS) filled polymer films
… determinations of a film's thickness and refractive index are possible. Poly(tert-butyl acrylate) (PtBA) films serve as a model system for the simultaneous determination of thickness and refractive index (1.45 at 632 nm). Thickness measurements on films of variable thickness agree with …
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Construction of an Optical Quarter-Wave Stack Using the ISAM (Ionic Self-Assembled Multilayers) Technique
… of one layer of titania nanoparticles with high refractive index and one layer of silica nanoparticles with low refractive index. This contrast in refractive indices is a desirable characteristic of quarter-wave stacks. The thicknesses and refractive indices of the two layers in the quarter-wave …
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Embedded Multilayer Thin Film Stacks as Polarizing Beam Splitters and Wave Retarders Operating under Condition of Frustrated Total Internal Reflection
… range of incidence angles. For a given set of refractive indices, all possible solutions for the thicknesses of the layers that suppress the reflection of p-polarized light at a specified angle, and the associated reflectance of the system for the orthogonal s polarization, are determined. The …
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Novel Materials and Processes for Fabrication of Integrated Photonic and Opto-Electronic Devices
… to create a TiO2-SiO2 blend with highly tunable refractive index and dielectric properties. New sulfur-based polymers are also used to create thin films of hybrid chalcogenide glass using both melt pressing and the spin coating methods with the polymer dissolved in a solvent, creating films that …
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Optical coherence tomography applied to investigations of optical properties of paintings
… Different methods of OCT measurements of refractive indices of paint layers are presented. The first attempt of monitoring the cleaning treatment of a painting was presented in order to detect whether there was a change in the original paint surface after solvent cleaning of old varnish …
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Flame hydrolysis deposition of photosensitive silicate layers suitable for the definition of waveguiding structures through direct ultraviolet writing
… losses of ~0.2dB/cm and relative core refractive indices of the order 1x10.
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Effects of the composition of suspended particles in water on the photosynthetically usable radiation and remote-sensing reflectance
… of the PSD, among other quantities such as refractive indices of the suspended particles, is insufficient to accurately characterize the light fields. This work describes how Ed and Rrs for waters of various Junge-type PSDs are computed, so that the effects of the PSD on these quantities can …
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