Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.5041485
Title: Nanofluidic terahertz metasensor for sensing in aqueous environment
Authors: Shih, Kailing 
Pitchappa, Prakash 
Jin, Lin 
Chen, Chia-Hung 
Singh, Ranjan
Lee, Chengkuo 
Keywords: Science & Technology
Physical Sciences
Physics, Applied
Physics
LABEL-FREE
METAMATERIAL
RESONANCES
PLATFORM
APTAMER
SENSITIVITY
MECHANISMS
DNA
Issue Date: 2018
Publisher: AMER INST PHYSICS
Citation: Shih, Kailing, Pitchappa, Prakash, Jin, Lin, Chen, Chia-Hung, Singh, Ranjan, Lee, Chengkuo (2018/08/13). Nanofluidic terahertz metasensor for sensing in aqueous environment. APPLIED PHYSICS LETTERS 113 (7). ScholarBank@NUS Repository. https://doi.org/10.1063/1.5041485
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.
Source Title: APPLIED PHYSICS LETTERS
URI: https://scholarbank.nus.edu.sg/handle/10635/188881
ISSN: 00036951
10773118
DOI: 10.1063/1.5041485
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