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Title: Nanofluidic terahertz metasensor for sensing in aqueous environment
Authors: Shih, Kailing
Pitchappa, Prakash
Jin, Lin
Chen, Chia-Hung
Singh, Ranjan
Lee, Chengkuo
Keywords: Terahertz Radiation
Terahertz Time-domain Spectroscopy
Issue Date: 2018
Source: Shih, K., Pitchappa, P., Jin, L., Chen, C. H., Singh, R., & Lee, C. (2018). Nanofluidic terahertz metasensor for sensing in aqueous environment. Applied Physics Letters, 113(7), 071105-. doi:10.1063/1.5041485
Series/Report no.: Applied Physics Letters
Abstract: The terahertz spectral region has received tremendous attention for label free chemical and biological sensing, due to the presence of molecular fingerprints, low energy characteristics, and remote sensing capabilities. However, a major hindrance for the realization of a high performance terahertz bio-chemical sensor comes from the large absorption of terahertz waves by aqueous solution. Here, we overcome this limitation by confining the analyte-aqueous solution in a nanovolumetric fluidic chamber, integrated on metamaterial resonant cavities. The metamaterial resonators confine electromagnetic fields in extremely subwavelength space and hence allow for the enhanced interaction between the nanovolumetric analyte-aqueous solution and terahertz waves, while minimizing the absorption loss. We compare the sensing performance of split ring resonator and Fano resonator systems as metamaterial resonators. As a demonstration of chemical sensing, three alcoholic solutions with different concentrations were measured. Selective adenosine triphosphate (ATP) sensing capability was examined through ATP aptamer functionalization on gold metamaterials, where a decrease in the transmittance value was observed as the ATP concentration increased. The proposed sensing approach has the potential to be an effective tool for molecular analysis through exploiting the advantages offered by low energy terahertz, subwavelength metamaterial resonators and nanofluidic technologies.
ISSN: 0003-6951
DOI: 10.1063/1.5041485
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2018 The Author(s). All rights reserved. This paper was published by AIP in Applied Physics Letters and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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