Rapid Prototyping of Reflective Beam-Steering Metasurfaces with the Plasmonic Phase-Change Material In<sub>3</sub>SbTe<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 40838341.
- Also identified by DOI 10.1021/acs.nanolett.5c03186.
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Abstract
Metasurfaces have evolved as prime candidates for miniaturized optical components to tailor the light-matter interaction. Conventionally, the fabrication and design of such metasurfaces with complex antenna structures are well-developed and precise but need clean-room access and multiple fabrication steps. While metasurfaces based on polarization conversion are limited to low efficiencies, metasurfaces with antennas above a metallic mirror reach much higher efficiencies by keeping the initial polarization. Here, we showcase rapid prototyping of reflective beam-steering metasurfaces to optimize their efficiency. We exploit the nonvolatile insulator-to-metal transition of the infrared plasmonic phase-change material In<sub>3</sub>SbTe<sub>2</sub> (IST). Via direct laser writing, we optically program reflective beam-steering metasurfaces with grating strips of varied width into thin IST layers and measure the anomalous reflection at a wavelength of 8.6 μm. Reconfiguring the grating bar widths and hence the covered phase range within the supercell leads to improved anomalous reflections of up to 75%. Our work enables reconfigurable, high-efficiency metasurfaces in the infrared range.