Design of binary diffractive microlenses with subwavelength structures using the genetic algorithm | Zendy

Tatsuya Shirakawa | Zendy; Kenichi L. Ishikawa | Zendy; Shuichi Suzuki | Zendy; Yasufumi Yamada | Zendy; Hiroyuki Takahashi | Zendy

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Design of binary diffractive microlenses with subwavelength structures using the genetic algorithm

Author(s) -

Tatsuya Shirakawa,

Kenichi L. Ishikawa,

Shuichi Suzuki,

Yasufumi Yamada,

Hiroyuki Takahashi

Publication year - 2010

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.18.008383

Subject(s) - microlens , optics , fresnel lens , lens (geology) , chromatic aberration , binary number , genetic algorithm , chromatic scale , focal length , fresnel number , computer science , diffraction , physics , materials science , mathematics , arithmetic , machine learning

We present a method to design binary diffractive microlenses with subwavelength structures, based on the finite-difference time-domain method and the genetic algorithm, also accounting for limitations on feature size and aspect ratio imposed by fabrication. The focusing efficiency of the microlens designed by this method is close to that of the convex lens and much higher than that of the binary Fresnel lens designed by a previous method. Although the optimized structure appears to be a binary Fresnel lens qualitatively, it is hard to quantitatively derive directly from the convex Fresnel lens. The design of a microlens with reduced chromatic aberration is also presented.

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