Multi-fano resonance metasurface refractive index sensor based on rectangular ring hole

Abstract

The invention discloses a multi-Fano resonance medium metasurface refractive index sensor based on connection of rectangular ring holes and short-circuit rectangular holes, and the optical refractive index sensor is mainly composed of a medium substrate and a metasurface microstructure unit array. The dielectric metasurface structure unit array is composed of a plurality of microstructure units, a rectangular ring hole is etched in each dielectric metasurface microstructure unit in a central symmetry mode and connected with a short-circuit rectangular hole, the side length of a square in a rectangular ring is R, the width of the hole is w, the length of the short-circuit rectangle is L, the width of the short-circuit rectangle is w, and the thickness of the metasurface structure is t. When light waves are vertically incident, three sharp Fano resonances are formed in a transmission spectrogram and can be used for a refractive index sensor. The sensor is made of an all-dielectric material, has no ohmic loss, and can be used for detecting gases and liquids with different refractive indexes.

Description

technical field [0001] The invention can be used in the fields of micro-nano optical sensing and integrated optical devices, and is specifically a multi-fano resonance metasurface refractive index sensor based on rectangular ring holes. Background technique [0002] With the development of nano-processing technology and optoelectronic integration industry, the research and design of nano-scale optical devices has become a very important research direction. Therefore, the development of new nanophotonic devices with smaller volume and superior performance is an important hot topic in the current international frontier research. As an important nanophotonic device, optical refractive index sensor is widely used in the measurement of refractive index in physical chemistry, biomedicine, food processing, etc. At present, people's research on the refractive index sensor mainly focuses on the metal-based plasmonic structure. However, due to the strong radiation loss caused by the ...

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Problems solved by technology

At present, people's research on the refractive index sensor mainly focuses on the metal-based plasmonic structure. However, due to the strong radiation loss caused by the free electron oscillation in the metal structure, the Q value of the metal structure is usually low, which limits the metal-based plasmonic structure. Applications of Plasmonic Structured Devices in Nanophotonics

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