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Subwavelength Terahertz Resonance Imaging (STRING) for Molecular Fingerprinting

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Title
Subwavelength Terahertz Resonance Imaging (STRING) for Molecular Fingerprinting
Author(s)
Taewoo Ha; Yoo, Daehan; Chaejeong Heo; Vidal-Codina, Ferran; Nguyen, Ngoc-Cuong; Kyung Ik Sim; Park, Sang Hyun; Wujoon Cha; Park, Sungsu; Peraire, Jaime; Kim, Teun-Teun; Young Hee Lee; Oh, Sang-Hyun
Publication Date
2022-12
Journal
NANO LETTERS, v.22, no.24, pp.10200 - 10207
Publisher
AMER CHEMICAL SOC
Abstract
Copyright © 2023 American Chemical Society. Subwavelength terahertz (THz) imaging methods are highly desirable for biochemical sensing as well as materials sciences, yet sensitive spectral fingerprinting is still challenging in the frequency domain due to weak light-matter interactions. Here, we demonstrate subwavelength THz resonance imaging (STRING) that overcomes this limitation to achieve ultrasensitive molecular fingerprinting. STRING combines individual ring-shaped coaxial single resonators with near-field spectroscopy, yielding considerable sensitivity gains from both local field enhancement and the near-field effect. As an initial demonstration, we obtained spectral fingerprints from isomers of alpha-lactose and maltose monohydrates, achieving sensitivity that was enhanced by up to 10 orders of magnitude compared to far-field THz measurements with pelletized samples. Our results show that the STRING platform could enable the development of THz spectroscopy as a practical and sensitive tool for the fingerprinting and spectral imaging of molecules and nanoparticles.
URI
https://pr.ibs.re.kr/handle/8788114/12490
DOI
10.1021/acs.nanolett.2c04610
ISSN
1530-6984
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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