Journal
PHOTONIX
Volume 3, Issue 1, Pages -Publisher
SPRINGERNATURE
DOI: 10.1186/s43074-022-00069-x
Keywords
Plasmonic metamaterial; Electromagnetic anapole; Refractive index sensor; Vertical split-ring resonator; Toroidal dipole
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Funding
- UK Engineering and Physical Science Research Council [EP/M009122/1, EP/T02643X/1]
- Royal Society [IEC/R3/170092]
- European Research Council [FLEET786851]
- Singapore Ministry of Education [MOE2016-T3-1-006]
- University Grants Committee/Research Grants Council of the Hong Kong Special Administrative Region, China [AoE/P-502/20, 15303521]
- Shenzhen Science and Technology Innovation Commission [SGDX2019081623281169]
- Department of Science and Technology of Guangdong Province [2020B1515120073]
- City University of Hong Kong [9380131]
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This work experimentally demonstrates the high sensitivity of a plasmonic anapole metamaterial sensor to the refractive index of the environment in the optical part of the spectrum. The results show promising potential for applications in biosensing and spectroscopy.
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 x 10(-5) RIU. This work will pave the way for applications of anapole metamaterials in biosensing and spectroscopy.
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