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 17 of 17 for “"Zone plates"”.
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Theory and design of integrated optical isolators and broadband couplers using Fresnel zone plates
This thesis is divided into two main sections: the first containing the analysis of the broadband vertical coupler, and the second involving the theory and design of the integrated optical isolators. In the first part we propose, theoretically investigate, and numerically demonstrate a compact …
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The development of a prototype Zone-Plate-Array Lithography (ZPAL) system
… research presented in this paper aims to build a Zone-Plate-Array Lithography (ZPAL) prototype tool that will demonstrate the high-resolution, parallel patterning capabilities of the architecture. The experiment will require the integration of micromechanical spatial light modulators with an …
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Femtosecond laser micro-machining and consequent self-assembled nano-structures in transparent materials
… written diffractive optic devices (Fresnel zone plates) embedded in a silica substrate. Both the focusing properties and efficiencies of the devices compared well with the theoretical values.
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Maskless nanolithography and imaging with diffractive optical arrays
… lithography. The work presented in this thesis, Zone-Plate-Array Lithography (ZPAL), bypasses some of the most pressing problems of current lithography equipment by developing a maskless lithography tool that will be scalable, flexible and cost-effective. It is the departure from a century-old …
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Zone plate array lithography in the deep UV
… of a new paradigm in nanolithography, zone plate array lithography (ZPAL), has yielded a clearer understanding of its operation, construction, and performance. The benefits of ZPAL as a maskless strategy to write arbitrary patterns with ~ 25 nm resolution are explored. To optimize the …
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Diffractive optics for maskless lithography and imaging
… lithography is accessible only to a select few. Zone-plate array lithography (ZPAL) is a novel method of maskless lithography that aims to alleviate some of these issues while offering a solution that can be extended to the limits of nanolithography. In ZPAL, an array of diffractive lenses is …
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Development of terahertz diffractive optics and plasmon-phonon polaritonics components /
… multilevel phase Fresnel lenses and metal Soret zone plates for focusing of 0.6 and 4.7 THz frequency radiation are discussed in the first part of this dissertation. Characterization of fabricated components was carried out, demonstrating the applicability of the fabrication method in component …
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Investigations of Horizontal-Parallax-Only Optical Scanning Holography (HPO-OSH) through MATLAB Simulations
… are simulated by convolving the Fresnel zone plates (FZP) with the object. The simulations focus on generating HPO holograms using 1-D FZPs modeled as 1-D Gaussian chirp beams of varying waists. An optical reconstruction scheme by cylindrical lens was proposed and simulated. …
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Performance and Analysis of a Deployable Diffractive Optical Element for Small Satellite Missions
… geometric and wave-optical models for Fresnel zone plates and multilevel diffractive lenses, leading to quantitative predictions of diffraction efficiency and PSF quality under non-idealities. A key contribution is the analytical and numerical analysis of how uniform thickness errors, …
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Microelectromechanical handheld laser-scanning confocal microscope: application to breast cancer imaging
… employing reflective binary-phase Fresnel zone plates monolithically integrated on the surface of the micromirror is presented.
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Characterization of liquid crystal on silicon SLMs for in-situ Raman imaging for quality control of processed lunar regolith
… Raman spectroscopy is possible by using Fresnel zone plates (FZP) superimposed by phase gradients mapped on the LCoS, which is an analytically computable and well understood method. In the presented work, a characterization and modelling of a LCoS is carried out with respect to the requirements …
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Optical sub-diffraction limited focusing for confined heating and lithography
… to confine light into smaller spot sizes.</p> <p>Zone plate diffraction lenses generate spots with dimensions very close to the diffraction limit. We report the fabrication of zone plates to be used in laser direct writing of silicon nanowires. We show experimentally and with numerical models that …
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Application of precision engineering for nanometre focussing of hard X-rays in synchrotron beam lines
Many modern synchrotron beamlines are able to focus X-rays to a few microns in size. Although the technology to achieve this is well established, performing routine experiments with such beams is still time consuming and requires careful set up. Furthermore there is a need to be able to carry out …
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Photogating Effect and Diffractive Optics in Low-Dimensional Structures
… (GFETs) as well as multi-level Fresnel zone plates (MLFZPs) are provided in detail. The photogating effect, understood as the ability of charge carriers to generate photocurrent when excited by an incident photon within a material, is crucial to the device physics of GFETs. We can …
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Imaging with parabolic refractive X-ray lenses
… mirrors and light-guides, multilayers, Fresnel-zone plates, ...). The main focus of this thesis is in the area of the development and manufacturing of refractive x-ray lenses, as well as their applications, i.e. at synchrotron sources of the third generation like the European Synchrotron …
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Dynamic Plasmonic Metasurfaces in the Visible Spectrum
… optical components, including lenses, waveplates and holograms containing sub-wavelength pixels have been demonstrated in the visible wavelength spectrum. The metasurfaces are able to mould optical wavefronts into arbitrary shapes with sub-wavelength resolution by introducing spatial …