Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/156239
Title: Terahertz microfluidic sensing with dual-torus toroidal metasurfaces
Authors: Xu, Jinjin
Liao, Denggao
Gupta, Manoj
Zhu, Yiming
Zhuang, Songlin
Singh, Rajan
Chen, Lin
Keywords: Science::Physics::Optics and light
Issue Date: 2021
Source: Xu, J., Liao, D., Gupta, M., Zhu, Y., Zhuang, S., Singh, R. & Chen, L. (2021). Terahertz microfluidic sensing with dual-torus toroidal metasurfaces. Advanced Optical Materials, 9(15), 2100024-. https://dx.doi.org/10.1002/adom.202100024
Project: NRF-CRP23-2019-0005
Journal: Advanced Optical Materials
Abstract: Toroidal excitation manifests as currents flowing on the surface of a torus along its meridians that are known as poloidal currents. Several intriguing phenomena such as nonradiating anapole excitation, dynamic Aharonov–Bohm effect, and vector potential in the absence of electromagnetic fields occur in the presence of toroidal excitations. Toroidal resonances in metamaterials also offer a platform to probe strong light–matter interactions in its proximity due to the nonradiating confinement of photons. Here, a dual-torus toroidal flexible metasurface containing an array of overlapped split ring resonators is experimentally demonstrated, which results in strong field confinement for enhanced sensing of polar liquid analytes. Microfluidic integrated dual-torus toroidal resonance experimentally shows significantly higher sensitivity of 124.3 GHz per refractive index unit compared to a single torus toroidal resonance. Flexible metasurfaces supporting dual torus toroidal resonance can find a wide range of applications in the development of ultrasensitive terahertz molecular sensors for probing real time monitoring of chemicals and biomolecules.
URI: https://hdl.handle.net/10356/156239
ISSN: 2195-1071
DOI: 10.1002/adom.202100024
Rights: This is the peer reviewed version of the following article: Xu, J., Liao, D., Gupta, M., Zhu, Y., Zhuang, S., Singh, R. & Chen, L. (2021). Terahertz microfluidic sensing with dual-torus toroidal metasurfaces. Advanced Optical Materials, 9(15), 2100024-, which has been published in final form at https://doi.org/10.1002/adom.202100024. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: embargo_20220811
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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