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ID 60786
Author
Iida, Takumi Department of Electrical and Electronic Engineering, Okayama University
Ishikawa, Atsushi Department of Electrical and Electronic Engineering, Okayama University ORCID Kaken ID publons
Tanaka, Takuo Metamaterials Laboratory, RIKEN Cluster for Pioneering Research
Muranaka, Atsuya Advanced Elements Chemistry Laboratory, RIKEN Cluster for Pioneering Research
Uchiyama, Masanobu Advanced Elements Chemistry Laboratory, RIKEN Cluster for Pioneering Research
Hayashi, Yasuhiko Department of Electrical and Electronic Engineering, Okayama University ORCID Kaken ID researchmap
Tsuruta, Kenji Department of Electrical and Electronic Engineering, Okayama University ORCID Kaken ID publons researchmap
Abstract
Chiral nature of an enantiomer can be characterized by circular dichroism (CD) spectroscopy, but such a technique usually suffers from weak signal even with a sophisticated optical instrument. Recent demonstrations of plasmonic metasurfaces showed that chiroptical interaction of molecules can be engineered, thereby greatly simplifying a measurement system with high sensing capability. Here, by exploiting super-chiral field in a metasurface, we experimentally demonstrate high-sensitive vibrational CD spectroscopy of alanine enantiomers, the smallest chiral amino acid. Under linearly polarized excitation, the metasurface consisting of an array of staggered Au nano-rods selectively produces the left- and right-handed super-chiral fields at 1600 cm−1, which spectrally overlaps with the functional group vibrations of alanine. In the Fourier-transform infrared spectrometer measurements, the mirror symmetric CD spectra of D- and L-alanine are clearly observed depending on the handedness of the metasurface, realizing the reliable identification of small chiral molecules. The corresponding numerical simulations reveal the underlying resonant chiroptical interaction of plasmonic modes of the metasurface and vibrational modes of alanine. Our approach demonstrates a high-sensitive vibrational CD spectroscopic technique, opening up a reliable chiral sensing platform for advanced infrared inspection technologies.
Note
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Takumi Iida et. al. Super-chiral vibrational spectroscopy with metasurfaces for high-sensitive identification of alanine enantiomers. Appl. Phys. Lett. 117, 101103 (2020) and may be found at https://doi.org/10.1063/5.0012331.
This fulltext is available in Sep. 2021.
Published Date
2020-09-09
Publication Title
Applied Physics Letters
Volume
volume117
Issue
issue10
Publisher
American Institute of Physics
Start Page
101103
ISSN
0003-6951
NCID
AA00543431
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
File Version
publisher
DOI
Web of Science KeyUT
Related Url
isVersionOf https://doi.org/10.1063/5.0012331
Funder Name
Japan Society for the Promotion of Science
助成番号
17H06173