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 28 for “"Antireflection"”.
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Biomimetic nanostructured surfaces for antireflection in photovoltaics
… from the top surface. Traditional thin film antireflection schemes are being challenged by new techniques that involve texturing on the subwavelength scale to form ‘moth-eye’ arrays, so called because they are inspired by Nature’s answer to unwanted reflections, the arrays of pillars found on …
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Subwavelength antireflection and polarization grating elements: Analysis and fabrication
… high power laser systems where damage resistant antireflection and birefringent materials may not exist. By gaining an understanding and being able to control the many variables involved in the grating fabrication process, one-dimensional and two-dimensional submicron period surface-relief resist …
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Broadband, millimeter-wave antireflection coatings for cryogenic sintered aluminum oxide optics
… dissertation attempts to address one of them: antireflection (AR) coatings for high-refractive index optics. I say ""attempts to address"" because the problem is far from solved. Rather, what follows is the first iteration of a process that can complement the growing need for high detector …
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Silver (Ag) nanoparticle based masks for the development of antireflection subwavelength structures in GaAs and Si solar cells
… that can be used as masks for the development of antireflection subwavelength grating (SWG) structures. We particularly investigate the impact of silver thin film thickness and the effect of annealing temperature on the fabrication of silver nanoparticles of controlled size and spacing …
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A parallel branch-and-bound algorithm for thin-film optical systems, with application to realizing a broadband omnidirectional antireflection coating for silicon solar cells
… then used to design a broadband omnidirectional antireflection coating for silicon solar energy. The design is experimentally validated using RF sputtering, and shows performance that is competitive with existing solutions based on impractical sophisticated nano-deposition techniques, as well as …
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Porous Silicon as Broadband Antireflector for Photovoltaic Application.
… losses, silicon surfaces are textured or antireflection coatings (ARC) are applied on the surface of silicon solar cells. Porous silicon can be achieved by electrochemical anodization of silicon in hydrofluoric acid, but the main disadvantage is that HF is highly toxic and corrosive, which …
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Accurate Characterisation of Refractive Components for Future CMB Missions
… University (MU) and Cardiff University. An antireflection coating was applied to the prototype lenses and measured to test its effectiveness. During the manufacturing process some issues were detected, including a difference in refractive index between the finished lens and the sample batch …
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Linear Optical Thin Films Formed by Electrostatic Self-Assembly
… stack filters and narrowband and wideband antireflection coatings are designed using TFCalc simulation software and are fabricated by ESA. Both bulk film sensitivity and layer sensitivity to manufacturing errors are provided. The significant agreement between simulation and experiment …
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Charge-coupled device optimizations for astronomy.
… mounting/thinning technique. The design of antireflection coatings for the near-UV through near-IR spectral regions is explained and demonstrated on silicon diodes, allowing quantum efficiencies as high as 90% to be obtained. The reduction of interference fringing amplitudes by as much as …
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Metal-assisted chemical etching of III-V semiconductors for advanced optoelectronic device fabrication
… feedback (DFB) lasers by MacEtch as well as antireflection textured GaAs photodiodes incorporating graphene quantum dots (GQDs). MacEtch behavior of InGaAsP in H2SO4 and H2O2 is dependent on the crystal orientation and material of the metal catalyst, as well as the stoichiometric composition …
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THE USE OF PECVD SILICON OXYNITRIDE THIN-FILMS IN MICROELECTRONICS MANUFACTURING
… with conventional ones, such as insufficient antireflection, substrate material and structure dependence. The antireflection layer with high photo absorption at the bottom absorbs most of light reflected from the substrate and the interference layer at the top suppresses the surface reflection …
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All-optical ultrafast switches based on thin film coated-tilted fiber Bragg grating
… in the gold coating. Finally, broadband antireflection of cladding guided light was demonstrated at the same thicknesses where percolation occurred, which leads to further potential applications in fiber-based nonlinear light-matter interactions.
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High efficiency thin film silicon solar cells with novel light trapping : principle, design and processing
… its width.The back reflector parameters and the antireflection coating are systematically optimized for thin film Si solar cells through simulation and experiments. A 2 [mu]m thick cell can achieve 54% efficiency enhancement using the optimized design.For proof of concept, the TPC back reflector …
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Electrostatic Self-Assembly of Linear and Nonlinear Optical Thin Films
… microns thick. Dielectric stack, Rugate, and antireflection optical interference filters were designed, synthesized and demonstrated. c(2) films of both commercially available polymer dyes and novel polymers designed specifically for the ESA process were demonstrated using second harmonic …
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Effects and applications of capillary condensation in ultrathin nanoparticle assemblies
… over coating thickness to achieve broadband antireflection (AR) functionality. Multi-stack AR coatings with alternating high- and low-index stacks were also made, and the influence of inter-stack and surface roughness on film transparency were studied quantitatively. The equivalent-stack …
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Black silicon and its applications in photovoltaics and biosensing
… solar cell with existing micro-structured antireflection layer. The reflection is further reduced by 70% and the conversion efficiency is increased by 14.7% relatively. Broadband and omnidirectional light-trapping black silicon was produced on ultrathin silicon micro solar cells. With …
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Ultra-thin photovoltaic technologies with nanophotonic textures for enhanced solar energy harvesting
… minimise i) front surface reflection by means of antireflection coatings, ii) transmission losses into the substrate by means of a rear mirror, and iii) outcoupling losses by means of light-trapping textures. Simultaneous application of these strategies, within architectures possessing maximal …
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CRT anti-glare treatments, image quality, and human performance
… quality of 16 mesh, etched, and quarterwave antireflection filters for varying levels of filter transmissivity. Three levels of ambient lighting and two levels of monochrome CRT resolution were combined factorially with the filters. In addition, user measures of readability, legibility, and …
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Construction of an Optical Quarter-Wave Stack Using the ISAM (Ionic Self-Assembled Multilayers) Technique
The purpose of this thesis is to make a broadband antireflection coating configuration known as a quarter-wave stack consisting of one layer of titania and of one layer of silica nanoparticles. We utilize much that is already known about silica nanoparticle deposition. The first objective of this …
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