Plasmonic anapole metamaterial for refractive index sensing

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Department of Electrical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China
2.
Optoelectronics Research Centre, Centre for Photonic Metamaterials, University of Southampton, SO17 1BJ, Highfield, Southampton, UK
3.
Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong SAR, China
4.
The State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong SAR, China
5.
Centre for Disruptive Photonic Technologies, SPMS, Nanyang Technological University, 637371, Singapore, TPI, Singapore

Funds:  The authors acknowledge support from University of Southampton, Nanyang Technological University, and City University of Hong Kong.

摘要

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Abstract: Electromagnetic anapole mode is a nonradiative state of light originating from the deconstructive interference of radiation of the oscillating electric and toroidal dipole moments. The high quality anapole-related resonances can be used in enhancing nonlinear electromagnetic properties of materials and in sensor applications. In this work, we experimentally demonstrate plasmonic anapole metamaterial sensor of environmental refractive index in the optical part of the spectrum. Our results show that the sensor exhibits high sensitivity to the ambient refractive index at the level of 330 nm/RIU and noise floor of 8.7 × 10^-5 RIU. This work will pave the way for applications of anapole metamaterials in biosensing and spectroscopy.
- Plasmonic metamaterial /
- Electromagnetic anapole /
- Refractive index sensor /
- Vertical split-ring resonator /
- Toroidal dipole

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参考文献(48)

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