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Proceedings Paper

Design diffractive micro lens using a combing method realizing short focal depth
Author(s): Di Feng; Yingbai Yan; Guofan Jin; minxian wu
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Paper Abstract

Diffractive micro lenses realizing short focal depth can be used in a variety of applications, such as confocal microscopy and optical signal processing, etc. As the size of diffracting structures with a diffractive optical elements is on the order of or less than the illumination wavelength, it is necessary to use a rigorous electromagnetic theory of diffraction to accurately design and analyze its performance. A rigorous electromagnetic synthesis and analyse of two-dimensional diffractive micro lenses with short focal depth and high lateral resolution is presented. Without paraxial approximation, focusing characteristics have been determined including the actual focal depth, the ratio between the focal depth of the designed micro lens and the focal depth of the conventional quadratic lens, etc. Numerical results show that the designed micro lenses indeed have the special feature of attaining a short depth and high lateral resolution, and that the ratio can reach to 0.37 for f-numbers 2.0, and 0.58 for f-numbers 0.6.

Paper Details

Date Published:
Proc. SPIE 5173, Current Developments in Lens Design and Optical Engineering IV, ; doi: 10.1117/12.502571
Show Author Affiliations
Di Feng, Tsinghua Univ. (China)
Yingbai Yan, Tsinghua Univ. (China)
Guofan Jin, Tsinghua Univ. (China)
minxian wu

Published in SPIE Proceedings Vol. 5173:
Current Developments in Lens Design and Optical Engineering IV
Pantazis Z. Mouroulis; Warren J. Smith; R. Barry Johnson, Editor(s)

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