Metamaterial absorber integrated microfluidic terahertz sensors

Hu, X., Xu, G., Wen, L., Wang, H., Zhao, Y., Zhang, Y., Cumming, D. R.S. and Chen, Q. (2016) Metamaterial absorber integrated microfluidic terahertz sensors. Laser and Photonics Reviews, 10(6), pp. 962-969. (doi:10.1002/lpor.201600064)

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Abstract

Spatial overlap between the electromagnetic fields and the analytes is a key factor for strong light-matter interaction leading to high sensitivity for label-free refractive index sensing. Usually, the overlap and therefore the sensitivity are limited by either the localized near field of plasmonic antennas or the decayed resonant mode outside the cavity applied to monitor the refractive index variation. In this paper, by constructing a metal microstructure array-dielectric-metal (MDM) structure, a novel metamaterial absorber integrated microfluidic (MAIM) sensor is proposed and demonstrated in terahertz (THz) range, where the dielectric layer of the MDM structure is hollow and acts as the microfluidic channel. Tuning the electromagnetic parameters of metamaterial absorber, greatly confined electromagnetic fields can be obtained in the channel resulting in significantly enhanced interaction between the analytes and the THz wave. A high sensitivity of 3.5 THz/RIU is predicted. The experimental results of devices working around 1 THz agree with the simulation ones well. The proposed idea to integrate metamaterial and microfluid with a large light-matter interaction can be extended to other frequency regions and has promising applications in matter detection and biosensing.

Item Type:Articles
Additional Information:This work is supported by the grants from the National Natural Science Foundation of China (No. 11274344, 11604367 and 61574158), Suzhou Science and Technology Development Program Foundation (No. ZXG201425) and the Royal Society Newton Advanced Fellowship.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cumming, Professor David
Authors: Hu, X., Xu, G., Wen, L., Wang, H., Zhao, Y., Zhang, Y., Cumming, D. R.S., and Chen, Q.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Laser and Photonics Reviews
Publisher:Wiley
ISSN:1863-8880
ISSN (Online):1863-8899
Published Online:04 October 2016
Copyright Holders:Copyright © 2016 WILEY-VCH Verlag GmbH and Co. KGaA
First Published:First published in Laser and Photonics Reviews 10(6): 962-969
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
688031Integrated Terahertz Sensors - Newton Advanced FellowshipDavid CummingThe Royal Society (ROYSOC)NA140301ENG - ENGINEERING ELECTRONICS & NANO ENG