Design Implementation And Analysis Of Structured Light Systems

Author : Luis Arturo Alemán-Castañeda
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)

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Download or read book Structured Light, Polarization and Birefringence written by Luis Arturo Alemán-Castañeda and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The concept of structured light has become increasingly popular amongst the optics research community. This concept refers to the study, generation, and applications of light whose intensity, phase, and/or polarization present spatial variations that endow it with interesting or useful properties. These degrees of freedom can carry information about the media in which light propagated and interacted with. Hence it is important to know how to manipulate them, in order to characterize the media/optical systems. This information can also enable correcting or eliminating biases in light-based measurement techniques. This thesis reports on four main projects in which structured light, polarization and/or birefringence play a vital role and intertwine: 1. Study of reflectors for structured illumination via conformal maps. 2. Polarization shearing interferometry via geometric phase. 3. Polarization super-resolution microscopy with simultaneous estimation of 3D localization, 3D orientation and wobble for single emitters. 4. Reverberant shearing elastography for anisotropic materials. The first project is on structured illumination and aims to give a conceptual and visual tool for the design and analysis of reflectors through a simple complex quadratic map that transforms the shape of a reflector into a curve, which we call the "light curve", that indicates where light is going after reflection. The second and third projects are based on light with structured polarization distributions, the coupling of polarization to other degrees of freedom of interest, and ultimately to a measurable structured intensity distribution. To achieve this, we utilize methodologies based on devices with spatially-varying birefringence, generated either via stress-induced birefringence, such as the stressed engineered optic (SEO), or with liquid crystals, such as Q-plates. The device proposed in the second project, the geometric phase shearing interferometer (GPSI), enables a wide variety of shearing geometries while being compact and robust to vibrations since its implementation is in-line. It is based on shearing two orthogonally circularly polarized replicas of the original beam, which interfere not in the traditionally sense but by creating a polarization structure that depends on the phase difference between the displaced/deformed replicas. The third project is a super-resolution technique for polarization fluorescence microscopy that allows the characterization of 3D localization plus 3D orientation and wobbling of single emitters. It is based on using the SEO to encode this information into the point spread function (PSF) shape, i.e. the image of a single point formed by the optical system. Previously the SEO had been used in single-shot 2D polarimetry. Its extension to super resolution fluorescence microscopy stems from the fact that fluorophores emit light as dipoles and that this can be thought of as a generalization to a 3D polarization problem. The last project on reverberant shearing elastography, while not originally envisioned under the scope of structured light, can be thought of as a mechanical analogue. For this project, polarization and birefringence play a key role to characterize the elastic properties of materials through the complex autocorrelation of the shearing waves present in the reverberant chamber"--Pages xix-xx