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Mid-infrared silicon metasurfaces for near-field enhancement of molecular fingerprints

Version 2 2023-03-10, 21:48
Version 1 2023-03-10, 21:48
Posted on 2023-03-10 - 21:48
Mid-infrared dielectric metasurfaces are promising promising fundamental building blocks for integrated sensing with high sensitivity and compositional selectivity. We have designed and fabricated a silicon metasurface with resonance properties in the 4 ~ 5 μm mid-infrared region. Benchmark FTIR characterizations on solutions of tungsten hexacarbonyl molecules showed a detection limit at 1 mg/mL, without any surface functionalization. We further rationalize the detection limit of the molecules-nanostructure open interface with volume field enhancement analysis. Our results show that mid-infrared silicon metasurfaces may be a suitable platform for potential integration with microfluidic for in-vivo detection.

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Optics Letters

AUTHORS (4)

Minglu Li
Ping Bai
Chang yan
Siying Peng

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