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 7 of 7 for “"Bessel beam"”.
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Confinement and Tracking of Brownian Particles in a Bessel Beam Standing Wave
… this, we used an axicon-generated, zeroth-order Bessel beam standing wave whose parameters were adjusted to allow tight axial confinement and loose transverse confinement of microscopic-sized particles in the central maximum of the Bessel beam. We chose a Bessel beam because its unique …
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Fresnel-focusing and bessel-beam integrated optical phased arrays for optical trapping applications
… have focused on systems which form and steer beams or project arbitrary radiation patterns in the far field. In this thesis, Fresnel-lens-inspired focusing integrated optical phased arrays are demonstrated for the first time and proposed as a method for chip-based optical trapping. These …
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Optimising light-sheet microscopy for high resolution live imaging of the early development of chick embryos
… depth can, in principle, be increased through beam shaping techniques. Hence, a Bessel beam light-sheet was generated to investigate if it would result in improved penetration depth. The Gaussian beam was modulated into a Bessel beam using a spatial light modulator and the Bessel light-sheet …
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Hybrid optical and acoustic trapping
… a technique which uses highly focused laser beams to trap and move microscopic objects, has become an important tool for many applications owing to its incredible precision and dexterity. Optical trapping is, however, limited in several ways. It often struggles with particles larger than 10 …
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Acoustic Radiation Force on a Fluid to Fluid Boundary by Phase Plate Focused Ultrasound
… type of lens creates a minimally diffractive Bessel beam and long depth of focus that is useful in ultrasonic imaging, therapy, and non-destructive evaluation techniques. Fields modified by fraxicon, Fresnel, and axicon lenses were characterized experimentally by scanning hydrophone …
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Generation and imaging of structural laser beams for optical trapping of airborne particles and light-matter interaction applications.
Recently emerged non-diffracting optical Bessel-Gaussian beams have extended the `optical toolbox' in laser interaction with matter studies, providing many techniques that are not possible using conventional Gaussian beams. The research work performed under this thesis focuses on the design, …
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Generation and imaging of structural laser beams for optical trapping of airborne particles and light-matter interaction applications.
Recently emerged non-diffracting optical Bessel-Gaussian beams have extended the `optical toolbox' in laser interaction with matter studies, providing many techniques that are not possible using conventional Gaussian beams. The research work performed under this thesis focuses on the design, …