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 529 for “"grating"”.
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Voltage programmable diffraction grating device
… This wrinkle is used as a variable diffraction grating that changes the wrinkle amplitude in proportion to the applied voltage squared. The device consists of a thin layer (between 8 μm and 50 μm) of 1-Decanol oil which coats a 0.5 μm thick layer of dielectric (SU8 photoresist) that itself has …
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Bragg grating filters for optical networks
… focuses on the exploitation of fibre Bragg gratings in optical communication networks. New designs, as well as procedures for dynamically altering grating characteristics are proposed for several important functions. We begin with designing gratings for flattening the gain profile of an …
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Sub-Optical Resonators With Grating Mirrors
Made available in DSpace on 2014-12-08T22:24:37Z (GMT). No. of bitstreams: 1 7000882.pdf: 1595756 bytes, checksum: 9fb41fa5e6a846aa646228bf8fcf012d (MD5) Previous issue date: 1969
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Design and fabrication of grating couplers
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Accurate characterization of nanophotonic grating structures
Augmented reality waveguides are designed to have grating regions to in-couple, out-couple, and propagate light from a light engine to the user. This thesis develops two reliable systems to qualify manufactured waveguides. The first system determines grating quality by measuring grating pitch and …
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Integrated silicon photonic two-dimensional grating couplers
… for a simple interfacing is the diffraction grating coupler (GC). In its most basic, one-dimensional implementation, a silicon waveguide mode is laterally enlarged by a taper structure, feeding a periodically etched grating. The latter deflects the light under a small angle with respect to …
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Strain sensor using fiber bragg grating interrogation
… novel design of strain sensor using Fiber Bragg Grating (FBG) interrogation. Studies on fiber optic sensors reported have mainly focused on FBG wavelength-based monitoring method by using optical spectrum analyzers (OSA). Although FBG has better strain sensitivity measurement, however there have …
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Optofluidic Bragg grating sensors for chemical detection
… applications of direct UV written Bragg grating refractometers for detection of chemical analytes. The technique of direct UV writing uses the localised refractive index increase of a photosensitive planar glass layer upon exposure to a tightly focussed UV beam to fabricate a wide range …
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Optimized grating coupler designs for integrated photonics
… research deals with the optimization of complex grating couplers for SOI platforms to couple light from a specific coupling scheme and it is divided in 4 sections. First, Chapter 2 presents in details the customized design routine, developed during my PhD, based on a Particle Swarm Optimization, …
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Resonant cavity Fibre Bragg grating sensor interrogation
… to time-division-multiplexing (TDM) fibre Bragg grating (FBG) optical sensors, known as the resonant cavity architecture. A background theory of FBG optical sensing includes several techniques for multiplexing sensors. The limitations of current wavelength-division-multiplexing (WDM) schemes are …
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Elastomeric grating sensor for multifunctional optofluidic biosensing
… and low cost. The Multifunctional Elastomeric Grating Sensor (EGS) presented in this thesis is fabricated using elastomeric materials. The EGS is made by integrating a two-dimensional (2D) diffraction grating inside a hemispherical chamber. The sensing mechanism of the EGS is based on the …
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Advanced fibre Bragg grating structures: design and application
… work on a variety of advanced fibre Bragg grating structures covering long dispersion compensating chirped Bragg gratings, superstructured Bragg gratings for identical multiple channel operation, Bragg gratings for pulse-shaping applications and Bragg gratings for add-drop applications in …
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Chloride Selective Gold Coated Fiber Bragg Grating Sensor
… at a chloride-sensitive gold-plated Fiber Bragg Grating (FBG) sensor that can detect chloride with good resolution. This sensor is designed for applications in water treatment plants and swimming pools where safety and quality matter. And for better results, we use Atomic Layer Deposition (ALD), …
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Advanced Fibre Bragg Grating fabrication systems and devices
This thesis address the creation of fibre Bragg grating based sensors and the fabrication systems which are used to manufacture them. The information is presented primarily with experimental evidence, backed up with the current theoretical concepts. The issues involved in fabricating high quality …
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A Vacuum Grating Monochromator for the Far-Infrared
Made available in DSpace on 2014-12-08T22:24:07Z (GMT). No. of bitstreams: 1 6706716.pdf: 2223880 bytes, checksum: 4d1034c0645b282aa8454630c38e2f71 (MD5) Previous issue date: 1966
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Image grating metrology using a Fresnel zone plate
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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Optical fiber temperature sensor based on fiber bragg grating
… fiber temperature sensor based on fiber Bragg Grating. The Fiber Bragg grating sensors can offer highly sensitive, cost effective solutions for optical sensing. While fiber Bragg gratings have been implemented in various sensing applications over the past few decades, recent efforts explore the …
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POLYMER–BASED RESONANT WAVEGUIDE GRATING STRUCTURE AND ITS APPLICATIONS
<p>Resonance waveguide grating structures have been a subject of interest for several decades. This optical technique offers unique advantages when compared with other optical components. This stems from their relatively simple structure comprised of layers, as well as their high reflection …
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Low-cost interrogation of optical fibre Bragg grating sensors
… capabilities of a scalable low-cost fibre Bragg grating sensor network. This network has been shown to be comparable with the performance of existing fibre Bragg grating sensing techniques, at a greatly reduced implementation cost.
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