Abstract

Herein, a novel design concept of a surface graphical photonic crystal (SGPC) has been proposed as an effective strategy to achieve angle-insensitive visible-infrared compatible camouflage. The SGPC, designed as a quasi-periodic Ge/ZnS photonic crystal following an arithmetic sequence in the physical thickness for each period, possesses a functionalized ZnS surface consisting of lithography-fabricated mosaic patterns with various etching depths. Our experiment data demonstrate the excellent infrared camouflage capability of the SGPC with a high average reflectance of 92.7% (surface emissivity $ϵ=0.07$) in 8–14 μm, and related simulations further reveal the satisfying angle-insensitive reflection characteristic with a maximum effective relative photonic bandgap ${\delta }_{\mathrm{BW}}=91.3\%$ in $0°\le \theta \le 60°$. Besides, the irregular mosaic patterns with various etching depths constitute a colorful digital camouflage on the surface of the SGPC, realizing an outstanding optical camouflage capacity without distinct angle dependency (dominant wavelength shift ${\delta }_{\lambda d}=|{\lambda }_{\theta }-{\lambda }_0|/{\lambda }_0\le 2.33\%$).

© 2018 Optical Society of America

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