Highly sensitive and selective sugar detection by terahertz nanoantennas
- Highly sensitive and selective sugar detection by terahertz nanoantennas
- 이동규; 강지훈; 이준석; 김효석; 김철기; 김재헌; 이택진; 손주혁; 박규환; 서민아
- Issue Date
- Scientific Reports
- VOL 5, NO 15459
- 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.
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