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Park, Hyeong‐Ryeol
Laboratory for Ultrafast & Nanoscale Plasmonics
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Colossal Absorption of Molecules Inside Single Terahertz Nanoantennas

Author(s)
Park, Hyeong-RyeolAhn, Kwang JunHan, SanghoonBahk, Young-MiPark, NamkyooKim, Dai-Sik
Issued Date
2013-04
DOI
10.1021/nl400374z
URI
https://scholarworks.unist.ac.kr/handle/201301/26329
Fulltext
https://pubs.acs.org/doi/10.1021/nl400374z
Citation
NANO LETTERS, v.13, no.4, pp.1782 - 1786
Abstract
Molecules have extremely small absorption cross sections in the terahertz range even under resonant conditions, which severely limit their detectability, often requiring tens of milligrams. We demonstrate that nanoantennas tailored for the terahertz range resolves the small molecular cross section problem. The extremely asymmetric electromagnetic environment inside the slot antenna, which finds the electric field being enhanced by thousand times with the magnetic field changed little, forces the molecular cross section to be enhanced by >10(3) accompanied by a colossal absorption coefficient of similar to 170 000 cm(-1). Tens of nanograms of small molecules such as 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) and lactose drop-cast over an area of 10 mm(2), with only tens of femtograms of molecules inside the single nanoslot, can readily be detected. Our work enables terahertz sensing of chemical and biological molecules in ultrasmall quantities.
Publisher
AMER CHEMICAL SOC
ISSN
1530-6984
Keyword (Author)
terahertz absorptionterahertz absorption coefficientterahertz cross sectionterahertz nanoantennaTerahertz nanoterahertz molecule sensing
Keyword
TIME-DOMAIN SPECTROSCOPYENHANCED INFRARED-ABSORPTIONFIELD ENHANCEMENTARRAYSEXPLOSIVESMONOLAYERSAPERTURESRADIATIONSUBSTRATEPOLARIZER

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