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 27 for “"LCoS"”.
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Phase and Polarization Modulations based on LCOS SLM
Liquid crystal on silicon (LCOS) technology has initially been developed for imaging and display applications. This technology combines the unique light-modulating properties of liquid crystal materials and the advantages of high-performance silicon complementary metal oxide semiconductor (CMOS) …
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Enhance of LCOS Phase Modulation in Visible Wavelength Range Based on Metasurface
… of metasurface with liquid crystal on 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 …
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Next Generation Phase-only LCOS Device with Ultra-low Phase Flicker for Holographic Applications
Phase-only LCOS devices have become one of the most promising optical engines for digital holographic applications. However, the system performance can be degraded by the instability of the phase levels, i.e., the so-called phase flicker. For instance, a large phase flicker means a low spatial …
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Nonlinear Analysis and Control of Aeroelastic Systems
… may lead to limit cycle oscillations (LCOs) in aeroelastic systems. LCOs can result in fatigue in wings leading to catastrophic failures. Existence of LCOs for velocities less than the linear flutter velocity has been observed during flight and wind tunnel tests, making such subcritical …
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Defining the mechanisms of specificity in the symbiosis signalling pathway of Medicago truncatula
… signals are essential. Perception of symbiotic LCOs induces a signalling pathway which is common to both mycorrhization and nodulation, and oscillations of calcium in the nucleus (so-called calcium spiking) are central to this common symbiosis signalling pathway. Detailed analysis of Medicago …
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Adaptive optics aberrometer and wavefront corrector using a twisted-nematic liquid-crystal on silicon chip
… a twistednematic liquid-crystal on silicon (TN-LCoS) chip as the wavefront corrector in conjunction with a Hartmann-Shack device as the wavefront sensor. TN-LCoS chips are originally designed to be used as mass-manufactured, high resolution image generating elements in video projectors. With …
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Electrically Tunable Liquid Crystal–Metasurface Devices for Phase Modulation in Telecom Band
… communication. In liquid crystal on silicon (LCoS) devices, it is achieved by tuning the effective refractive index of the liquid crystal (LC) material. However, realising a full 2π shift requires a thick LC layer, which slows the response and limits device performance. Metasurfaces introduce …
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Programmable Liquid-Crystal-on-Silicon Photonic Integrated Circuits with Millions of Degrees of Freedom
… crystal layer using Liquid-Crystal-on-Silicon (LCoS) technology. Utilizing the electro-optical properties of LCs, we demonstrate the theoretical feasibility of inducing refractive index variations solely within the LC medium to guide light. This method diverges from traditional waveguiding …
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Characterization of liquid crystal on silicon SLMs for in-situ Raman imaging for quality control of processed lunar regolith
… regolith material using Crystal on Silicon (LCoS) as spatial light modulators for laser spectroscopy. These spatial light modulators use liquid crystal technology for their design. Unlike mechanical scanners, it has no moving parts subject to failure from shock and vibration. To extend the …
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Molecular signalling in Lupinus albus-Rhizobium lupini symbiosis
… and bacterial lipochitooligosaccharides (LCOs) are known to act as modulators of species-specificity in the early stages of infection. Of the several known Rhizobium -legume symbioses, signalling in Lupinus remains to be determined. Using a screening method based on the in vitro ability of …
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All-Optically Addressed Spatial Light Modulator and Diffractive Optical Element Based on Photoalignment of Azobenzene Polymer
… engines such as liquid crystal on silicon (LCOS) spatial light modulators (SLMs) and optically addressed SLMs (OASLMs) face scalability limitations in achieving smaller pixel sizes, wider diffraction angles, and greater information transmission capacity due to their reliance on electrical …
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Modeling and analysis of a H₂-H₂O driven reversible solid oxide cell system for electrical energy storage applications
… (RTE) with a levelized cost of storage (LCOS) as low as 13.5 ¢/kWh. Because of thermal management challenges associated with maintaining ReSOC stack operating conditions in either the highly endothermic or exothermic operating modes, approaches for integration of various thermal energy …
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Model reduction for nonlinear dynamical systems with parametric uncertainties
… -- one which exhibits limit cycle oscillations (LCOs) and Hopf-bifurcations. Highfidelity simulations for systems with LCOs are computationally intensive, precluding probabilistic analyses of these systems with uncertainties in the input parameters. In this thesis, we employ a projection-based …
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Modeling and Design of Digitially Controlled Voltage Regulator Modules
… might introduce the limit cycle oscillations (LCOs) to the converter, which will generate the stability issues. Actually, LCOs can not be totally eliminated theoretically. One way to reduce the possibilities of LCOs is to employ a high resolution Digital Pulse-Width-Modulator (DPWM). However, …
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Opportunity for Long Duration Storage Technologies: Thermal and Compressed Air Energy Storage
… wasted resources. The levelized cost of storage (LCOS) is used to assess future, representative TES and CAES systems in LDES applications. A sensitivity analysis is performed on LCOS parameters to show the effect of design choices on system cost. From the technology and cost assessments, …
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Metabolic support in left ventricular hypertrophy
… with GIK was associated with a reduction in LCOS from 33% in the control group to 10% in the treatment group, p=0.0001. Treatment with GIK was associated with a significant increase in the level of protein O-GlcNAcylation. Conclusions: In this trial, treatment with GIK was associated with a …
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Advanced Computational Holography for Perceptual Enhancement and Application in HUDs
… physical characteristics of liquid crystals in LCoS devices, where anisotropy arises from the rubbed alignment layer. The analysis reveals that the effective spread of fringing field effect follows a Laplacian-like profile, with energy preferentially extending along the rubbing axis and …
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Time Spectral Adjoint Based Design for Flutter and Limit Cycle Oscillation Suppression
… method based approach to compute flutter onset, LCOs and their design sensitivities in a computationally efficient manner. The time spectral based formulation approximates the solution as a discrete Fourier series and directly solves for the periodic steady state, leading to a steady formulation. …
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How small and medium sized enterprises (SMEs) can influence the successfulness of a partnership with a large company (LCO) in the technology innovation sector
… channels, the LCO can often provide. LCOs, on the other hand, need to be innovative in order to survive in a dynamic and ever changing business environment. LCOs are therefore open to new ideas, being in the form of knowledge and capabilities. The reality is, however, that many …
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