4.8 Article

Mirror-Coupled Plasmonic Bound States in the Continuum for Tunable Perfect Absorption

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LASER & PHOTONICS REVIEWS
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WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202300294

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critical coupling (CC); enhanced absorption; mirror BICS; near-fields enhancements; perfect absorber (PA); plasmonic bound states in the continuums (BICS); surface-enhanced infrared absorbance spectroscopy (SEIRAS)

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This article introduces a new method that combines mirror-coupled resonances with the loss engineering capabilities of plasmonic quasi-bound states in the continuum to tailor the light-matter interaction in different coupling regimes. The study demonstrates the application of a pixelated plasmonic perfect absorber metasurface for multispectral surface-enhanced molecular spectroscopy over a broad range of mid-infrared wavenumbers using a single gap size.
Tailoring critical light-matter coupling is a fundamental challenge of nanophotonics, impacting fields from higher harmonic generation and energy conversion to surface-enhanced spectroscopy. Plasmonic perfect absorbers (PAs), where resonant antennas couple to their mirror images in adjacent metal films, excel at obtaining different coupling regimes by tuning the antenna-film gap size. However, practical PA applications require constant gap size, making it impossible to maintain critical coupling beyond singular wavelengths. Here, a new approach for plasmonic PAs is introduced by combining mirror-coupled resonances with the unique loss engineering capabilities of plasmonic quasi-bound states in the continuum. This novel combination allows to tailor the light-matter interaction within the under-coupling, over-coupling, and critical coupling regimes using flexible tuning knobs including asymmetry parameter, dielectric gap, and geometrical scaling factor. The study demonstrates a pixelated PA metasurface with optimal absorption over a broad range of mid-infrared wavenumbers (950-2000 cm(-1)) using only a single gap size and applies it for multispectral surface-enhanced molecular spectroscopy. Moreover, the asymmetry parameter enables convenient adjustment of the quality factor and resonance amplitude. This concept expands the capabilities and flexibility of traditional gap-tuned PAs, opening new perspectives for miniaturized sensing platforms towards on-chip and in situ detection.

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