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 23 for “"light modulation"”.
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High-resolution spatial light modulation for holographic video
… systems which currently require high-bandwidth light modulation. The modulator will have a spatial frequency bandwidth one order-of-magnitude greater than current light modulation technologies and be two orders of magnitude less expensive.
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Middle infrared beam-steering using liquid crystals for spatial light modulation
… effects, on the performance of a spatial light modulator were investigated. Liquid crystal on silicon implementation was simulated. For $ \lambda= 2.3 \mu$m an efficiency $ > 10 \% $ was attained for angles up to $ 7^{\circ} $. For longer wavelengths this was attained for angles up to $ …
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Enhancement of Carotenoid Biosynthesis and Antioxidant Responses in Diatoms by Light Modulation
… the antioxidant network in lowering or repairing light stress or damage is poorly understood. <br></br><br></br> My thesis consists of the concomitant investigation of the photoprotective and antioxidant network functioning in the coastal diatom <i>Skeletonema marinoi</i>, and during an experiment …
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Resonant Spatial Light Modulation: Optical Programming and Sensing at the Fundamental Limit
… yet remains an open goal for present-day spatial light modulators (SLMs), active metasurfaces, and optical phased arrays. Here, we develop wavelength-scale, high-finesse photonic crystal cavity arrays as a solution to this problem. Specifically, we demonstrate nanosecond- and femtojoule-order …
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Holosuite : an exploration into interactive holographic telepresence
… advances in hologram computation algorithms and light modulation materials. Due to the niche and inaccessibility of holographic display research, however, literature on applications of holographic display technology remains scarce. In this thesis, we describe a holographic display application …
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Double-Exposure Gray-Scale Photolithography
… be realized by controlling the transmitted UV light intensity in a process termed gray-scale photolithography. Light modulation is accomplished by diffraction through sub-resolution pixels on a photomask. The number of photoresist levels is determined by the number of different pixel sizes on …
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Phase derivative microscopy of biological cells and tissues
… specimens. These methods utilize spatial light modulation at the Fourier plane of a bright field microscope to optically obtain the derivatives of the phase and increase the contrast of the final image. The controllable spatial modulation pattern allows obtaining both the first-order and …
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A tissue, a building, Santiago de Chile : transformation of the images and elements of the language of space and form into the design of a promenade
… generated by walls; scales, dimensions and light modulation of such components all contribute to the making of a promenade acting as a catalyst for the revitalization of Centro Poniente
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Novel DMD-based Lidar and Display Systems
… beam steering is multiplexed with spatial modulation for Angular Spatial Light Modulation (ASLM). The ASLM technique is employed as a holographic beam steering mechanism for a lidar system for increased angular resolution and field of view. Third, the ASLM technique is implemented into a …
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Optofluidic Microreactors for Advanced Photocatalysis
… platform has many benefits: HC-PCF’s light-guiding abilities and low-loss properties make absorp- tion spectroscopy based screening of reaction intermediates at low sample concentrations possible. The photoreduction of methyl viologen by carbon nanodots (CNDs) was studied and compared …
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BiDi screen : depth and lighting aware interaction and display
… of this thesis is to exploit the spatial light modulation capability of LCDs to allow dynamic mask-based scene capture without interfering with display functionality. A large-format image sensor is placed slightly behind the liquid crystal layer. By alternatly switching the liquid crystal …
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Concrete Innovation Museum: A Symphony of Liquid Stone and Light
… to shape spatial experience, manipulate sunlight, and enrich architectural expression. The project is sited in DuSable Park, a 3.4-acre remediated site at the mouth of the Chicago River, overlooking Lake Michigan. The park honors Jean Baptiste Point du Sable, Chicago's first non-Native …
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Using low cost components to determine chlorophyll concentration by measuring fluorescence intensity
… interface between the high sensitivity TSL257 light-to-voltage light sensors and the 32-bit ARM microcontroller that controls the system. The microcontroller software controls the 470 nm LED current to create a 75 ms light pulse that has a 63 Hz sine wave modulated on it. The low cost light …
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Disordered Optics for Multidimensional Information Processing
… spectral components, and the second spatial modulation layer mediates spectral aliasing. Unlike conventional snapshot spectral imagers, our design does not require sub-super-pixel-level sensing, which enables the efficient usage of sensor resolution. We further demonstrated a grayscale …
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The design and application of polymeric materials in a novel light modulated accelerometer.
A novel accelerometer based on light modulation has been designed and a prototype device manufactured. The device utilises the change in refractive index brought about by stress induced by the applied vibration. A detailed mathematical analysis of several feasible sensing designs has been performed …
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Paths Towards Shape Change: Elastic Instabilities and Spontaneous Deformations
… the activation strength of the LCE via light modulation. Moreover, we show that patterned shape changes are not limited to 2D and discuss the origin of the 3D deformation that causes twist and contraction in LCE fibres. Finally, we recognise the last and mechanically most rich path …
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Optimizing Light Requirements and Dilution Rates for Maximizing Algal Cell Growth and Lipid Content for Biofuel Feedstock Production
… Investigate the effect of cycling high-intensity lights to identify optimum Dark:Light (D/L) ratios, which can be effectively used by researchers to maximize aerial biomass productivities; (3) Develop a deterministic model to simulate the biomass productivity in an continuous-flow bioreactor at …
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Enhance of LCOS Phase Modulation in Visible Wavelength Range Based on Metasurface
… silicon (LCOS) technology to enhance the phase modulation capability while reducing the thickness of the liquid crystal layer, addressing key challenges in high-performance holographic displays. LCOS devices are known for their high-resolution light modulation, but their phase depth and response …
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Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells
… cells (DSSCs). The birefringence of LCs causes light modulation, which can be controlled by an applied voltage and electric field. In particular, the LCs are used as one of the components for the electrolyte redox couple which is responsible for charge transfer mechanism in DSSCs. In this work, …
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Optical micro- and nanofibres: Higher mode generation and particle manipulation studies
… profile is generated free space via spatial light modulation. This technique facilitates coupling to the LP11 fibre mode in two-mode fibre, and convenient, fast switching to the fundamental mode via computer-generated hologram modulation. Following LP11 mode loss when exponentially tapering …
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