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 8 of 8 for “"wavefront shaping"”.
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Optical polarization control in free space and through random media using wavefront shaping
Light is widely used in areas such as optical communications, 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 …
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Focusing Light Inside Scattering Media with Optical Phase Conjugation
… media, optical phase conjugation based wavefront shaping techniques, such as time-reversed ultrasonically encoded (TRUE) optical focusing, are being actively developed. In this dissertation, I will describe our efforts to improve the performance (speed, focusing quality and focusing …
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Coherent effects in wave propagation through complex media
… in random media that is complementary to wavefront shaping. Lastly, a class of critical states embedded in the continuum is uncovered in a one-dimensional optical waveguide array with one non-Hermitian defect. These states are on the verge of being fractal and have real propagation …
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Quantum Imaging of Biosamples
… tuning the growth of the molecules for arbitrary wavefront shaping with natural crystals. Finally, because of the wide range of crystals in the spherulite class, further investigation into different spherulites could shed light on the relationship between crystal symmetry and structure, and the …
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Investigation of Bragg Gratings in Few-Mode Fibers with a Femtosecond Laser Point-by-Point Technique
… with a general framework of MDM with adaptive wavefront shaping in few-mode fibers (FMFs) and multimode fibers (MMFs), followed by two examples in slightly more detail. The fabrication setup and an short overview of the FS laser system will also be covered. In Chapter 3, we show the design, …
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Multi-functional Holographic Acoustic Lenses for Modulating Low- to High-Intensity Focused Ultrasound
… the dynamics of nonlinear acoustic beam shaping in engineered HALs. First, We will introduce 3D-printed metallic acoustic holographic mirrors for precise spatial manipulation of reflected ultrasonic waves. Optimization algorithms and experimental validations are presented for applications …
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Holographic Control of Light Propagation in Optical Waveguides
Optical waveguides form the backbone of the internet and have also been a driving technology in medical imaging and optical sensing. Modern holography can now be used to control every aspect of light propagation along an optical waveguide. The application of holographic techniques offers the …