Flat Retroreflector Based on a Metasurface Doublet Enabling Reliable and Angle‐Tolerant Free‐Space Optical Link (Advanced Optical Materials 21/2021)

In article number 2100796, Duk-Yong Choi, Sang-Shin Lee, and co-workers demonstrate a flat retroreflector (FRR) based on metasurface doublet in the telecommunications wavelengths. The proposed FRR was utilized to achieve a reliable and angle-tolerant optical link bridging the gap between metasurface-based devices and future integrated communication systems.