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Proceedings Paper

Novel two-dimensional photonic crystals designed by evolutionary algorithms
Author(s): Stefan F. Preble; Hod Lipson; Michal F. Lipson
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Paper Abstract

We use evolutionary algorithms to search the space of two-dimensional photonic crystals with maximum bandgaps for a given index contrast. The unit-cells of the photonic crystal are represented as bitmaps which are either directly encoded or generated through bottom-up and top-down construction trees. The fitness criterion rewards for partial band gaps and is evaluated by solving for the photonic crystals bands using an eigensolver in a planewave basis. Starting from random patterns and with no prior knowledge, the process discovered a number of novel photonic crystals, some with bandgaps that are 12.5% larger than any previously reported human-designed crystals.

Paper Details

Date Published: 25 October 2004
PDF: 11 pages
Proc. SPIE 5597, Nanophotonics for Communication: Materials and Devices, (25 October 2004); doi: 10.1117/12.570841
Show Author Affiliations
Stefan F. Preble, Cornell Univ. (United States)
Hod Lipson, Cornell Univ. (United States)
Michal F. Lipson, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 5597:
Nanophotonics for Communication: Materials and Devices
Michal F. Lipson; George Barbastathis; Achyut K. Dutta; Kiyoshi Asakawa, Editor(s)

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