Abstract

In this paper, a new ultra-thin and broadband wide-angle polarization-insensitive metasurface solar absorber is designed and optimized. The proposed metasurface absorber topology is optimized by using a genetic algorithm to enhance the bandwidth and decrease the unit cell area. The proposed unit cell is designed with fourfolded symmetric subunit cells rotated in the clockwise direction to achieve a polarization-independent response. The unit cell with $320\times 320{\mathrm{nm}}^2$ area and 50 nm thickness has a broadband ($\ge 90\%$) absorption response in the visible frequency region of the solar spectrum and infrared from 350 THz to 700 THz for normal incident angles and higher than 70% for incident angles up to 40° at both polarizations.

© 2018 Optical Society of America

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