Journal
NANO LETTERS
Volume 13, Issue 4, Pages 1782-1786Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl400374z
Keywords
Terahertz nano; terahertz molecule sensing; terahertz absorption; terahertz absorption coefficient; terahertz cross section; terahertz nanoantenna
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Funding
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2008-0062255, K20815000003, 2010-0029648, 2011-0019170, 2011-0020209]
- Seoul Scholarship Foundation
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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.
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