Unity integration of grating slot waveguide and microfluid for terahertz sensing

Liang, L. et al. (2018) Unity integration of grating slot waveguide and microfluid for terahertz sensing. Laser and Photonics Reviews, (doi:10.1002/lpor.201800078) (Early Online Publication)

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Abstract

Refractive index sensing is attracting extensive interest. Limited by the weak light–matter interaction and the broad bandwidth of resonance, the figure of merit (FoM) of terahertz (THz) sensors is much lower than their counterparts in visible and infrared regions. Here, these two issues are addressed by incorporating a microfluidic channel as a slot layer into a grating slot waveguide (GSW), where guided‐mode resonance results in a narrowband resonant peak and the sensitivity increases remarkably due to the greatly concentrated electromagnetic fields in the slot layer. Both reflective and transmissive sensors are developed with the calculated quality (Q) factors two orders of magnitude larger than metamaterial and plasmonic sensors, and the sensitivities one order of magnitude larger than grating waveguide sensors, contributing to a record high FoM of 692. The measured results match well with the simulations considering the fabrication errors, where the degeneration of narrowband transmission peaks in experiments is attributed to the error of the microfluidic channel height and the divergence of the incident beam. The proposed unity‐integrating configuration with simultaneous optimizations of the resonance mechanism, and the spatial overlap between the sensing field and the analytes shows the potential for high sensitivity bio and chemo sensing.

Item Type:Articles
Additional Information:This work was supported by the grants fromthe National Natural Science Foundation of China (Nos. 61574158,11774383, 11604367, and 21703083), the National Key Basic ResearchProgram of China (No. 2014CB339806), the Royal Society NewtonAdvanced Fellowship, the Chinese Academy of Sciences President’sInternational Fellowship Initiative (No. 2017DT0009), the Cutting-edgeKey Research Program of Chinese Academy of Sciences (No. QYZDB-SSW-JSC014), Natural Science Foundation of Guangdong Province (Nos.2017A030310463 and 2017A030313026).
Keywords:Atomic and molecular physics, and optics, electronic, optical and magnetic materials, condensed matter physics
Status:Early Online Publication
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cumming, Professor David and Escorcia Carranza, Dr Ivonne and Grant, Dr James
Authors: Liang, L., Hu, X., Wen, L., Zhu, Y., Yang, X., Zhou, J., Zhang, Y., Escorcia Carranza, I., Grant, J., Jiang, C., Cumming, D. R.S., Li, B., 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 2018
Copyright Holders:Copyright © 2018 Wiley-VCH GmbH & Co. KGaA, Weinheim
First Published:First published in Laser and Photonics Reviews 2018
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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