Search for dissertations about: "high-contrast grating"
Found 5 swedish dissertations containing the words high-contrast grating.
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1. VCSELs for High-Speed, Long-Reach, and Wavelength-Multiplexed Optical Interconnects
Abstract : The vertical-cavity surface-emitting laser (VCSEL) is the standard light source in short-reach fiber-optic links in datacenters and supercomputers. These systems use an enormous number of links, making cost and energy efficiency pressing issues. READ MORE
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2. Optical Guiding and Feedback in Gallium Nitride Based Vertical Cavity Surface Emitting Lasers
Abstract : The gallium-nitride (GaN) semiconductor material has been the core of the revolutionary breakthroughs during the last two decades in the lighting industry, by enabling manufacturing of efficient blue light emitting diodes (LEDs), for which the 2014 Nobel prize in physics was awarded. The GaN technology has further led to violet edge-emitting lasers (EELs), enabling the Blu-ray disk technology, and also to the commercialization of directly green emitting EELs. READ MORE
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3. Photonic devices with MQW active material and waveguide gratings : modelling and characterisation
Abstract : The research work presented in this thesis deals with modelling, design and characterisation of passive and active optical waveguide devices. The rst part of the thesis is related to algorithm development and numerical modelling of planar optical waveguides and gratings using the Method of Lines (MoL). READ MORE
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4. Improving Peripheral Vision Through Optical Correction and Stimulus Motion
Abstract : The loss of central vision subsequent to macular disease is often extremely debilitating. People with central field loss (CFL) must use other peripheral areas of the retina in order to see; areas with inferior resolution capacity, which are also affected by off-axis optical errors. READ MORE
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5. Spatial Vision in Bees : Behavioural investigation of spatial resolution and contrast sensitivity
Abstract : Bees use multiple sensory modalities to perform day-to-day tasks. Light allows them to perceive objects and the general features of their surroundings, enabling them to find food and to navigate safely across the landscape. READ MORE