Plasmonic metasurfaces composed of arrays of rectangular metallic bars are well known for their strong optical response in the infrared spectral range. In this study, we explore the polarization sensitivity of plasmonic metasurfaces for encoding information. The polarization-sensitive optical response depends strongly on the orientation of the metallic bars allowing the encoding of information into the metasurface. Here we demonstrate that a 2-dimensional polarization encoded metasurface can be obtained by using mask-less two-photon polymerization techniques. This novel approach for the fabrication of plasmonic metasurfaces enables the rapid prototyping and adaptation of polarization sensitive metasurfaces for the encoding of multiplexed images.

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Micheal McLamb, Yanzeng Li, Victoria P. Stinson, Nuren Shuchi, Dustin Louisos, and Tino Hofmann, "Bi-encoded metasurfaces for the infrared spectral range," Proc. SPIE 12417, Optical Components and Materials XX, 124170L (Presented at SPIE OPTO: January 31, 2023; Published: 14 March 2023); https://doi.org/10.1117/12.2661109.