Journal
FRONTIERS IN PHYSICS
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fphy.2021.664864
Keywords
terahertz sensing; substrate etching; electromagnetically induced transparency; metamaterials; sensitivity
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Funding
- National Science Foundation of China [51675103]
- Fujian Provincial Science and Technology Project [2019I0004]
- State Key Laboratory of Mechanical Systems [MSV-2018-07]
- Shanghai Natural Sciences Fund [18ZR1414200]
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The research proposed a metamaterial sensor utilizing electromagnetically induced transparency resonance, which enhances the interaction between light and matter through substrate etching, leading to significantly improved sensitivity and potential applications in biosensing.
A broad range of terahertz (THz) metamaterials have been developed for refractive index sensing. However, most of these metamaterials barely make sufficient use of the excited electric field which is crucial to achieve high sensitivity. Here, we proposed a metamaterial sensor possessing electromagnetically induced transparency (EIT) resonance that is formed by the interference of dipole and quadrupole resonance. In particular, the strengthening of light-matter interaction is realized through substrate etching, leading to a remarkable improvement in sensitivity. Hence, three kinds of etching mode were presented to maximize the utilization of the electric field, and the corresponding highest sensitivity is enhanced by up to similar to 2.2-fold, from 0.260 to 0.826 THz/RIU. The proposed idea to etch substrate with a strong light-matter interaction can be extended to other metamaterial sensors and possesses potential applications in integrating metamaterial and microfluid for biosensing.
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