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説明:

Photonic resonance modes can be spectrally coupled to the vibrational modes of molecules in the mid-infrared regime through interactions between localized electric fields and nearby molecules. According to recent studies, radiative loss engineering of coupled systems is a promising approach for tailoring coupling conditions and enhancing the molecular signals. However, this strategy has only been realized using the localized surface plasmon resonances of metal nanostructures, which suffer from increased ohmic loss in the mid-infrared region and face serious limitations in achieving high quality (Q) factors. In this study, we adopt silicon-based metasurfaces formed on silicon-on-insulator wafers to achieve high Q factors and tune the coupling conditions between the quasi-bound states in the continuum (qBICs) and molecular vibrations. The coupling between the resonance mode and polymethyl methacrylate molecules is tailored from weak to strong coupling regimes by simply changing the structural asymmetry parameter and utilizing the intrinsically high Q factors of the qBIC modes. In addition, we identify the optimal asymmetry parameter that maximizes the enhanced molecular signal, opening a route toward realizing highly sensitive surface-enhanced infrared spectroscopy using complementary metal-oxide semiconductor compatible all-dielectric materials.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: BIC, metasurfaces, SEIRA, spectroscopy, strong coupling

刊行年月日: 2023-10-27

出版者: Wiley

掲載誌:

• Advanced Optical Materials (ISSN: 21951071) vol. 12 issue. 6 2301912

研究助成金:

• Japan Society for the Promotion of Science JP22K20496

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/adom.202301912

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更新時刻: 2024-04-04 08:30:24 +0900

MDRでの公開時刻: 2024-04-04 08:30:24 +0900