Highly sensitive and selective sugar detection by terahertz nanoantennas

Title
Highly sensitive and selective sugar detection by terahertz nanoantennas
Authors
이동규강지훈이준석김효석김철기김재헌이택진손주혁박규환서민아
Issue Date
2015-10
Publisher
Scientific Reports
Citation
VOL 5, NO 15459
Abstract
Molecular recognition and discrimination of carbohydrates are important because carbohydrates perform essential roles in most living organisms for energy metabolism and cell-to-cell communication. Nevertheless, it is difficult to identify or distinguish various carbohydrate molecules owing to the lack of a significant distinction in the physical or chemical characteristics. Although there has been considerable effort to develop a sensing platform for individual carbohydrates selectively using chemical receptors or an ensemble array, their detection and discrimination limits have been as high in the millimolar concentration range. Here we show a highly sensitive and selective detection method for the discrimination of carbohydrate molecules using nano-slotantenna array-based sensing chips which operate in the terahertz (THz) frequency range (0.5–2.5 THz). This THz metamaterial sensing tool recognizes various types of carbohydrate molecules over a wide range of molecular concentrations. Strongly localized and enhanced terahertz transmission by nano-antennas can effectively increase the molecular absorption cross sections, thereby enabling the detection of these molecules even at low concentrations. We verified the performance of nanoantenna sensing chip by both THz spectra and images of transmittance. Screening and identification of various carbohydrates can be applied to test even real market beverages with a high sensitivity and selectivity.
URI
http://pubs.kist.re.kr/handle/201004/50592
ISSN
20452322
Appears in Collections:
KIST Publication > Article
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