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Diffractive optical elements Operating in Regime of Full Complex Modulation

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Author(s):
Patricia Soares Pinto Cardona
Total Authors: 1
Document type: Doctoral Thesis
Press: São Paulo. , gráficos, ilustrações, tabelas.
Institution: Universidade de São Paulo (USP). Instituto de Física (IF/SBI)
Defense date:
Examining board members:
Luiz Goncalves Neto; Paulo Eduardo Artaxo Netto; Lucila Helena Deliesposte Cescato; Mikiya Muramatsu; Patrick Bernard Verdonck
Advisor: Luiz Goncalves Neto
Field of knowledge: Physical Sciences and Mathematics - Physics
Indexed in: Banco de Dados Bibliográficos da USP-DEDALUS
Location: Universidade de São Paulo. Biblioteca do Instituto de Física; C268e; D
Abstract

In this work, we developed two sets of DOESs able to modulate both phase and amplitude components of light simultaneously (Complete Complex Modulation CCM). The first set is composed of Fourier Holograms calculated by Iteractive Fourier Transform Algorithm (IFTA). The second set is composed by Fresnel Holograms, which light propagation was calculated by spatial linear filtering obtained from the solution of the Helmholtz Equation in the frequency domain. In both cases, Complete Complex Modulation was physically implemented by a micro-relief, for phase modulation, recorded on a Diamond Like Carbon (DLC) film deposited on a glass substrate. Amplitude modulation was implemented on a aluminum fim layer deposited on this relief. In this layer, micro-appertures proportional to the amplitude on each pixel, were recorded. Phase modulation in each pixel of the Fourier Holograms was achivied by different thicknesses of the DLC film. For Fresnel Holograms, phase modulation was achieved by combining two different thicknesses of DLC film inside each pixel. The elements were physically and optically characterized and produced reconstruction images completly free of speckle like noise. The optical reconstruction images produced from Fresnel Holograms working in CCM regime and convencional phase-only modulated Fourier Holograms were compared. (AU)