All-dielectric chiral-field-enhanced Raman optical activity

Ting-Hui Xiao (), Zhenzhou Cheng, Zhenyi Luo, Akihiro Isozaki, Kotaro Hiramatsu, Tamitake Itoh, Masahiro Nomura, Satoshi Iwamoto and Keisuke Goda ()
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Ting-Hui Xiao: The University of Tokyo
Zhenzhou Cheng: The University of Tokyo
Zhenyi Luo: The University of Tokyo
Akihiro Isozaki: The University of Tokyo
Kotaro Hiramatsu: The University of Tokyo
Tamitake Itoh: National Institute of Advanced Industrial Science and Technology
Masahiro Nomura: The University of Tokyo
Satoshi Iwamoto: The University of Tokyo
Keisuke Goda: The University of Tokyo

Nature Communications, 2021, vol. 12, issue 1, 1-7

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

Date: 2021
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DOI: 10.1038/s41467-021-23364-w

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