Biomolecular sensing in all-dielectric metasurfaces with collective resonances

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K20496
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0402:Nano/micro science, applied condensed matter physics, applied physics and engineering, and related fields
• Research Institution: National Institute for Materials Science
• Principal Investigator: WATANABE Keisuke 国立研究開発法人物質・材料研究機構, 若手国際研究センター, ICYSリサーチフェロー (90945362)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: メタサーフェス / BIC / シリコン / バイオセンサ / 強結合 / 赤外分光

Outline of Final Research Achievements

All-dielectric nanostructures composed of high refractive index materials have attracted significant attention as a new strategy for highly sensitive sensing devices relying on their sharp spectra because they have lower material absorption losses than conventional metal nanostructures. In this study, we have demonstrated highly sensitive molecular sensing using a collective response at a singularity, called bound state in the continuum (BIC), in a dielectric array. Moreover, we investigated the coupling properties between BIC resonance modes and molecular vibrations in the mid-infrared regime, opening a route toward realizing highly sensitive surface-enhanced infrared spectroscopy without the use of metals.

Free Research Field

ナノフォトニクス

Academic Significance and Societal Importance of the Research Achievements

本研究により、BICの原理を用いた誘電体メタサーフェスが光と物質の相互作用の増大に大きく寄与することが示され、高感度な生体分子の検出や分析デバイスの新たな基盤技術となりうることを示した。シリコンナノ構造は、金属ナノ構造に比べ材料コストが安く、高精度な既存のCMOSプロセスを用いた大量生産が可能であり、実用センシングデバイスへのメリットも大きい。