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Showing 1 to 20 of 570 for “"refractive index"”.
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Porous silicon as a platform for gradient refractive index photonics
… electrochemically etching bulk Silicon (Si). The refractive index of PSi is readily modulated by the electrochemical current density, making PSi inherently applicable to gradient refractive index (GRIN) applications. A GRIN broadly refers to a spatially-varying refractive index, whether discrete …
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Optical fibre refractive index, voltage and strain sensors : fabrication and applications
… applications in three major sensing areas: refractive index (RI), voltage and strain. The thesis aims to provide detailed information on the design and performance of particular intensity-based and wavelength-based (fibre Bragg gratings (FBGs)) OFSs in these three major areas. Furthermore, …
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Analysis of Flow and Transport in Refractive Index Matched Porous Media
… of a method for the highly precise matching of refractive indices, the dynamics of the dye distribution inside a threedimensional porous medium could be determined with a high temporal and spatial resolution using planar laser-induced fluorescence. For the data analysis specifically adapted …
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High-resolution 3-D refractive index imaging and Its biological applications
… activity of various structures in living cells. Refractive index is an intrinsic contrast source, but at the same time it is an important biochemical parameter that is proportional to the concentration of molecules. By measuring the refractive index quantitatively, the alteration of cells under …
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Tunable and High Refractive Index Polydimethylsiloxane Polymers for Label-Free Optical Sensing
… label-free optical detection methods based on refractive index, can overcome the limitations of conventional VOC detection methods. A variety of tunable and high refractive index PDMS materials were developed by incorporating a range of titanium and zirconium concentrations (2.5 – 30 mol % and …
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Determining the Refractive Index of Phytoplankton via Direct Measurement of Cellular Structures
<p>The refractive index of phytoplankton has never been directly measured before despite its importance towards studying the optical characteristics of marine particles. Previous attempts to measure it have been done through indirect methods. While these methods have proven useful, they contain …
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Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics
… their applications in infrared spectroscopy, refractive index sensing and subwavelength nonlinear optics.
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A novel ultra-low refractive index nanoporous dielectric based aqueous core waveguide system
… of the aqueous solution. The relatively low refractive index of aqueous solutions places a serious constraint on the choice of the cladding materials. Nanoporous dielectric materials are engineered to be low refractive index by packing nano sized voids within a matrix material. This research …
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Photoinduced, refractive-index gratings in germanium-doped two-mode, elliptical-core optical fibers
Permanent, photoinduced refractive-index gratings written along the longitudinal axis of germanium-doped, two-mode, elliptical-core fibers are found to affect the differential phase modulation between the co-propagating LP₀₁ and LP₁₁ even modes. The modal beat length of a two-mode fiber grating is …
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Novel Carbazole Based Methacrylates, Acrylates, and Dimethacrylates to Produce High Refractive Index Polymers
… polymers have demonstrated good optical, photo-refractive, and charge-transporting properties, combined with ease of processing. The objective of this research was to design, synthesize, and characterize high refractive index polymers and copolymers for use in optical spectacle lenses of …
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Measurement of Temperature, Refractive Index, or Axial Acceleration with Etched PCF Microfiber Structure
… (IFPI) cavity to measure axial acceleration, refractive index, and temperature. The sensor structure is based on previous work done by R. Wang at the Center for Photonics Technology. This work suggests its flexibility in many different roles with a sensitivity to axial acceleration of 70 …
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Mitigated Motion-Induced Signal Loss and Enabled Refractive Index Measurement in Optical Coherence Tomography
… accurate particle signature identification, the refractive index of the tiles must be precisely measured. For this application, OCT is an ideal candidate. In this thesis, I design and demonstrate an OCT-based procedure that is suitable for the precise group refractive index measurement of a …
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Time domain measurement of the nonlinear refractive index in optical fibers and semiconductor film
A new technique to measure the nonlinear refractive index n_2 in optical fibers and semiconductor films has been developed. It is based on the time delay two-beam coupling of very intense picosecond laser pulses that have been self-phase modulated in the nonlinear optical medium. The two beams are …
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Digital Holographic Micro-Interferometery for the Measurement of the Refractive Index of Biological Cells
… microscope that can be used to measure the refractive index of biological cells at different wavelengths that extend to the near-infrared spectrum was built. The interference pattern produced by the reference and object beams was recorded by a CCD camera. The recording process followed a …
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The construction of an ellipsometer to measure the refractive index and thickness of thin films.
… for use in measuring the thickness and refractive index of thin dielectric films. An attempt has been made to rationalise the mathematical approach and to present a valid method for the evaluation of results. The first Chapter is a general introduction to methods for measuring the …
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Development of a Planar Capillary Electrophoresis device coupled with dual refractive index and fluorescence detection
… backscatter interferometry (BSI) detection. This refractive index (RI) detection method is capable of universal detection of analytes including small inorganic ions, amino acids, and proteins. Due to the rapid separation capabilities, it can also be used to detect binding interaction between …
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Refractometry Studies of the Optical Properties of Polymer Films and the Development of Polymer Coated Refractive Index Sensors
… for protecting ecosystems and human health. Refractive index sensing is a non-selective technique that can be used to measure almost any analyte. Miniaturized refractive index sensors, such as silicon-on-insulator (SOI) microring resonators are one possible platform, but require coatings …
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