Abstract

A concept of two-dimensional periodic subwavelength gratings exhibiting different reflectance on the front and back sides is presented. This structure incorporates an arrangement of a metalized hole array and a nanodot array on top. We exemplify the optical properties for an aluminum grating with 243 nm period, and we demonstrate its color filtering properties for unpolarized light in reflectance as well as in transmittance yielding different colors for frontside and backside illumination. These findings have been confirmed by a numerical study. The gratings may be replicated by a simple nanoimprint process on plastic foils predestined for industrial mass production.

© 2013 Optical Society of America

Reflective colored image based on metal–dielectric–metal-coated gratings

Hans Lochbihler
Opt. Lett. 38(9) 1398-1400 (2013)

Colored images generated by metallic sub-wavelength gratings

Hans Lochbihler
Opt. Express 17(14) 12189-12196 (2009)

Semi-permeable resonant aluminum gratings for structural coloration in transmission

Hans Lochbihler and Bernd H. Kleemann
Opt. Lett. 46(9) 2200-2203 (2021)

Reflection color filters of the three primary colors with wide viewing angles using common-thickness silicon subwavelength gratings

Yoshiaki Kanamori, Toshikazu Ozaki, and Kazuhiro Hane
Opt. Express 22(21) 25663-25672 (2014)

Low-loss two-dimensional silicon photonic grating coupler with a backside metal mirror

Yannong Luo, Zhichao Nong, Shengqian Gao, Huamao Huang, Yuntao Zhu, Liu Liu, Lidan Zhou, Jian Xu, Lin Liu, Siyuan Yu, and Xinlun Cai
Opt. Lett. 43(3) 474-477 (2018)