Integrating polarization conversion and nearly perfect absorption with multifunctional metasurfaces

Manipulating electromagnetic waves with artificial nanostructures has garnered great interest for their properties and potential applications. However, existing devices performing various desired operations at different wavelengths usually require cascading with different geometry patterns, which does not offer satisfactory simplicity. Here, we theoretically and experimentally demonstrate that an ultrathin, multifunctional metasurface, consisting of an array of nanorods, can perform various functions at different wavelengths. Simulated and experimental results indicate that nearly perfect absorption, linear-to-circular conversion, and linear cross-polarization conversion can be integrated into one multifunctional metasurface. Furthermore, the multifunctional metasurface can maintain very high performance across a large range of incident angles. The proposed configuration is extremely compact and easy to fabricate; these qualities should support the development of practical applications.

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