Design and Simulation of Phase Fresnel Lens Array and Microlens Array
Date Issued
2014
Date
2014
Author(s)
Chiou, Pei-Chuen
Abstract
Integral imaging is composed of a microlens array (MLA) and a photosensor or CCD. MLA is the key element of capturing the 3D information, which is used to encode the angular information into the photosensor. The 3D information can be applied to image processing, such as depth reconstruction and digital refocusing. Recently, MLA is fabricated by several kinds of methods, including roller embossing, gray-scale photolithography, thermal reflow, and ink-jet methods. In this thesis, we design the several MLAs and PFLs and fabricated by CAD Lab in National Taiwan University using Two Photon Polymerization (TPP) technology. TPP technology offers high resolution, hence the fabrication of complicated micro-structure in polymers is achieved. The effects of microlens parameter such as aperture size and microlens number on image quality are discussed. Due to the advantages of light weight and uniform thin lens thickness, the concept of using a phase Fresnel lens (PFL) array as a microlens array is proposed. The fabrication time of a PFL is significantly reduced compared to a refractive microlens array. The measurement and simulation results of MLA and PFL are presented and discussed. The optical performance and simulation results of supplementary zones-surrounded Fresnel zone plate (SZFZP) are also investigated. Furthermore, a simulation method which can be used to produce elemental image is also proposed. Therefore, the fabrication budget is cost down with this simulation method evaluating the optimized design of MLA.
Subjects
Integral Imaging
microlens array (MLA), Two Photo
Polymerization (TPP) technology
phase Fresnel lens (PFL)
supplementary zones-surrounded Fresnel zone plate (SZFZP)
Type
thesis
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