On design of hybrid diffractive optics for achromatic extended depth-of-field (EDoF) RGB imaging

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Abstract

A hybrid imaging system is a simultaneous physical arrangement of a refractive lens and a multilevel phase mask (MPM) as a diffractive optical element (DOE). The favorable properties of the hybrid setup are improved extended-depth-of-field (EDoF) imaging and low chromatic aberrations. We built a fully differentiable image formation model in order to use neural network techniques to optimize imaging. At the first stage, the design framework relies on the model-based approach with numerical simulation and end-to-end joint optimization of both MPM and imaging algorithms. In the second stage, MPM is fixed as found at the first stage, and the image processing is optimized experimentally using the CNN learning-based approach with MPM implemented by a spatial light modulator. The paper is concentrated on a comparative analysis of imaging accuracy and quality for design with various basic optical parameters: aperture size, lens focal length, and distance between MPM and sensor. We point out that the varying aperture size, lens focal length, and distance between MPM and sensor are for the first time considered for end-to-end optimization of EDoF. We numerically and experimentally compare the designs for visible wavelength interval [400-700] nm and the following EDoF ranges: [0.5-100] m for simulations and [0.5-1.9] m for experimental tests. This study concerns an application of hybrid optics for compact cameras with aperture [5-9] mm and distance between MPM and sensor [3-10] mm.

Original languageEnglish
Title of host publicationUnconventional Optical Imaging III
EditorsMarc P. Georges, Gabriel Popescu, Nicolas Verrier
PublisherSPIE
Number of pages16
ISBN (Electronic)9781510651487
DOIs
Publication statusPublished - 2022
Publication typeA4 Article in conference proceedings
EventUnconventional Optical Imaging - Virtual, Online
Duration: 9 May 202220 May 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume12136
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceUnconventional Optical Imaging
CityVirtual, Online
Period9/05/2220/05/22

Keywords

  • Diffractive imaging
  • encoded phase mask
  • Fourier optics
  • hybrid diffractive optics
  • image processing
  • inverse imaging
  • joint design of diffractive optics

Publication forum classification

  • Publication forum level 0

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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