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 11 of 11 for “"microlenses"”.
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Integrated microlenses and multimode interference devices for microflow cytometers
The convergence of microfabrication technologies, novel materials systems, and techniques for chemical and biochemical analysis is enabling the realisation of lab-on-a-chip technology. Products incorporating such technologies are expected to find widespread use, for example in personal medicine, …
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Tunable liquid microlenses formed from dynamically re-configurable double emulsions
Micro-scale optical components capable of on-demand reconfiguration of their internal morphology and composition would enable unprecedented control of light propogation on the microscale. Double emulsions formed from immiscible hydrocarbons and fluorocarbons offer a promising platform as …
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Analysis of Fabry-Pérot laser resonators stabilized by microlenses and applications in speckle-free imaging
In this work, laser arrays comprising thousands of beams are experimentally demonstrated by stabilizing macroscopic Fabry-Pérot resonators with microlens arrays. The cavity parameters are tunable to either force fundamental-mode lasing across the array or to promote oscillation of various …
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Stable and unstable resonators within Fabry-Pérot optical cavities containing microlenses: laser arrays, low-coherence imaging, and fractal laser modes
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Miniature Microscope Design And Construction Based On Tilted Rotationally Asymmetric Printed Lenses
… spherical glass lens and three printed microlenses. The printed lenses were patterned using grayscale lithography in a custom engineered photosensitive hybrid sol-gel glass material. Illumination was delivered by high-brightness Light Emitting Diodes (LEDs) via multimode fiber. The …
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Analysis of Dynamic Surface Instabilities in Soft Hydrogel Cylinders Subject to Laser-Driven Shock-Loading
… applications such as the fabrication of microlenses, and the development of soft robots, actuators and ŕexible electronics. Static instabilities in soft matter have been well studied theoretically, and they are known to result from bifurcations of equilibrium due to loss of convexity of …
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Daylighting applications of micro-textured optical surfaces
… light. The angular filter or 'solar shade' uses microlenses to image the direct sunlight which can then be blocked by circular obturations. The diffuse sunlight is not focused and therefore transmitted so the room is not darkened. The research is based on experimentation with small-scale systems …
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Development of an ultraprecision shaping machine for manufacturing of Stavax lens molds
The production of high-precision aspheric microlenses has become increasingly difficult due to an increase in the complexity of the profile, the decrease in the lens’ size, and the demand for tighter tolerances. Machines built to fabricate these lenses generally include several expensive components …
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HIGH PERFORMANCE NANOPHOTONIC CAVITIES AND INTERCONNECTS FOR OPTICAL PARAMETRIC OSCILLATORS AND QUANTUM EMITTERS
… out of photonic chips. In particular, polymer microlenses of 20 μm diameter are fabricated on the facet of photonic chips that increase the tolerance of the chips to misaligned input fibers by a factor of approximately 4. To do so, we develop the on-axis DLW method for photonic chips, which …
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Porous silicon as a platform for gradient refractive index photonics
Porous silicon (PSi) is a versatile optical material that is formed by 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 …
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Theoretical and experimental assessment of the optical response of planar microlens arrays
The purpose of this thesis is to develop a theoretical method to estimate the optical properties and response of a homogenous, apposition microlens array. While other similar studies of microlens arrays have been performed, none were found to determine the total field of view, overlap in the field …