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 13 of 13 for “"polarization control"”.
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Polarization control and measurement with meta-optics
… elements which, if designed with explicit polarization dependence, provide a fascinating platform for new polarization optics. In this thesis, we present metasurface diffraction gratings designed to produce arbitrarily specified polarization states on a set of defined diffraction orders, …
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Ultrathin metasurface devices for phase and polarization control
… in the manipulation of amplitude, phase and polarization have led to the development of novel, compact optical devices with specially designed functionalities. In this thesis, we simultaneously control the phase and polarization state of light with one single metasurface, enabling novel …
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Integrated diffractive optical elements for terahertz beam shaping and polarization control /
… elements (DOEs) for efficient beam focusing, polarization control and enhanced transparency in the terahertz (THz) frequency range (0.1–1 THz). Utilizing semiconductor- and metal-based elements, the research introduces hybrid multi-phase Fresnel zone plate (H-MPZP) lenses with reduced …
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Optical polarization control in free space and through random media using wavefront shaping
… micro/nano fabrication, industrial process control, material characterization, and biomedical imaging. The usefulness of light in these areas depends on the dexterity with which the state of the optical field, defined by the spatio-temporal distribution of the field's phase, intensity, …
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Spatial Emission and Polarization Control in Integrated Photonics for Optical-Trapping and Trapped-Ion Systems
… critical advanced functionality such as spatial control of light in the near field or polarization control at visible wavelengths. This thesis addresses this gap by designing and experimentally demonstrating the first, to the best of our knowledge, cell experiments using single-beam integrated …
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Impurity-induced disordering of vertical-cavity surface-emitting lasers: Applications to polarization control and high-speed modulation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Quasi-Elastic Light Scattering Diagnostics for a High Voltage Spark Discharge
… the positionally stable spark discharge. Active polarization control on the light scattering instrument was characterized using ellipsometry and Mueller calculus. Mie scattering theory was used in the determination of particle size in an aluminum cathode model system.
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Phase and Polarization Modulations based on LCOS SLM
… pattern (multi-beam arrays) with target linear polarization state is required to encode information onto the nanograting structure created by laser pulses. In data writing beam generation, phase-only LCOS SLM can generate arbitrary data pattern by using diffractive holographic imaging. However, …
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Extreme ultraviolet polarization optics for polarimetry of structured high harmonics
… extreme ultraviolet (EUV) and attosecond pulses. Polarization characterization in this spectral range is important to understand the phenomena of HHG and quantify the light used for experiments. Furthermore, polarization control allows for polarization-dependent experiments in the EUV. This thesis …
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Modulation approaches of vertical-cavity surface-emitting lasers with mode control
… VCSELs with modified structures for mode control are presented. Direct modulation of VCSELs with separate optical and current apertures enables high modulation bandwidth of greater than 18 GHz operating single mode at low current density of less than 6 kA/cm2 because the current aperture …
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Liquid Crystal Materials And Tunable Devices For Optical Communications
… properties characterized. Most LC devices are polarization sensitive. To overcome this drawback, we have investigated the polymer-stabilized cholesteric LC (PSCLC). Combining the curing temperature effect and high birefringence LC, a polarization independent fiber-optical device is realized …
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Controlled Lasing in Gallium Nitride Nanowires
… However, due to the limited lasing control techniques, most of the nanowire lasers operate in naturally-occurring multi-mode and randomly polarized states. Lasing control in nanowire lasers is strongly desired for many practical applications. For instance, specifically polarized …
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Lightwave Electronics Based on Nanoantenna Networks
… of optical waveforms has paved the way for controlling electrons at optical frequencies [1]–[7]. This breakthrough has led to a deeper understanding of electron dynamics, particularly in the context of light field-driven phenomena in solids, a field commonly referred to as lightwave …