Evolutionary Multi-Objective Optimisation of Colour Pixels based on Dielectric Nano-Antennas

Abstract

The rational design of photonic nanostructures consists in anticipating their optical response from simple models or as variations of reference systems. This strategy is limited when different objectives are simultaneously targeted. Inspired from biology, evolutionary approaches drive the morphology of a nano-object towards an optimum through several cycles of selection, mutation and cross-over, mimicking the process of natural selection. However, their extension to scenarii with multiple objectives demands efficient computational schemes. We present a numerical technique to design photonic nanostructures with optical properties optimized along several arbitrary objectives. This combination of evolutionary multi-objective algorithms with frequency-domain electro-dynamical simulations is used to design silicon nanostructures resonant at user-defined, polarization-dependent wavelengths. The spectra of pixels fabricated by electron beam lithography following the optimized design show excellent agreement with the targeted objectives. The method is self-adaptive to arbitrary constraints, and therefore particularly interesting for the design of complex structures within technological limits.

arXiv comment10 pages, 6 figures + 10 pages of supporting informations including 17 additional figures

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