All-dielectric chiral-field-enhanced Raman optical activity

• DOI: 10.1038/s41467-021-23364-w
• Publication Date: 2021-05-24T10:02:53Z
• Authors: Ting-Hui Xiao; Zhenzhou Cheng; Zhenyi Luo; Akihiro Isozaki; Kotaro Hiramatsu; Tamitake Itoh; Masahiro Nomura; Satoshi Iwamoto; Keisuke Goda
• Keywords: Raman optical activity; Chirality

Abstract Raman optical activity (ROA) is effective for studying the conformational structure and behavior of chiral molecules in aqueous solutions advantageous over X-ray crystallography nuclear magnetic resonance spectroscopy sample preparation cost performance. However, ROA signals are inherently minuscule; 3–5 orders magnitude weaker than spontaneous scattering due to weak light–matter interaction. Localized surface plasmon on metallic nanoparticles has been employed enhance signals, but suffers from detrimental spectral artifacts its photothermal heat generation inability efficiently transfer chirality far field near field. Here we demonstrate all-dielectric chiral-field-enhanced by devising a silicon nanodisk array exploiting dark mode overcome these limitations. Specifically, use it with pairs chemical biological enantiomers show >100x enhanced light–molecule interaction negligible measurements.