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Graphene assisted terahertz metamaterials for sensitive bio-sensing

Authors
Lee, Sang-HunChoe, Jong-HoKim, ChulkiBae, SukangKim, Jin-SooPark, Q-HanSeo, Minah
Issue Date
1-5월-2020
Publisher
ELSEVIER SCIENCE SA
Keywords
Metamaterial; Terahertz; Biosensor; Graphene
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.310
Indexed
SCIE
SCOPUS
Journal Title
SENSORS AND ACTUATORS B-CHEMICAL
Volume
310
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/56057
DOI
10.1016/j.snb.2020.127841
ISSN
0925-4005
Abstract
We report that single-stranded deoxyribonucleic acids (ssDNAs) at very low concentrations can be detected using graphene-combined nano-slot-based terahertz (THz) resonance. A combination of the resonant structure and tuned electro-optical properties of graphene can provide unprecedentedly sensitive biomolecule sensing even using very low energy THz photons, overcoming the huge scale difference of 10,000:1 between the wavelength and the size of the ssDNAs. Ultrahigh sensitivity is obtained by the significant increase in the absorption cross-section of the graphene sheet with the targeted biomolecules, induced by strong THz field enhancement at the resonance frequency inside the slots. Clearly distinguishable THz optical signals were observed between different species of ssDNAs even at the nano-mole level and analyzed quantitatively in terms of the electro-optical properties of the suspended graphene layer modified by the attached ssDNAs without any molecular-specific labeling for the THz regime. Quantitative analysis of ssDNA molecule adsorption was carried based on the change in conductivity using a theoretical THz transmission model.
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College of Science > Department of Physics > 1. Journal Articles
Graduate School > KU-KIST Graduate School of Converging Science and Technology > 1. Journal Articles

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