Nano-composite resonant cavity periodic array metasurface multichannel infrared filter

Abstract

The invention relates to a nano-composite resonant cavity periodic array metasurface multichannel infrared filter. The filter comprises a gold film which is arranged on a SiO2 substrate and has a nano-structure, and the gold film with the nano-structure is a metasurface; the nano-structure on the metasurface is a composite resonant cavity of a periodic array; the composite resonant cavity comprises a horizontal resonant cavity and two vertical resonant cavities perpendicular to the horizontal resonant cavity; the two vertical resonant cavities are arranged on two sides of the horizontal resonant cavity; the two vertical resonant cavities are communicated with a cavity body of the horizontal resonant cavity; the widths of the horizontal resonant cavity and the vertical resonant cavities are in sub-wavelength magnitude; the metasurface has three transmission enhancement peaks, the first transmission enhancement peak is generated by the horizontal resonant cavity, and the second transmission enhancement peak and the third transmission enhancement peak are respectively generated by the two vertical resonant cavities. The filter is formed on the basis of the metasurface with the nano structure, selective transmission is carried out on light waves with specific frequency on the nano magnitude, and the limitation of optical diffraction limit is broken through.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a metasurface multi-channel infrared filter of a nanocomposite resonant cavity periodic array. Background technique [0002] Individual metal nanoresonator plasmonic metasurfaces have extraordinary optical properties, such as supertransmission, strong nonlinear effects, and negative refractive index, etc., and have been an active research field in the past few decades, and have applications in biosensing, Visible light filters and nonlinear effect generators have application prospects. However, it is difficult to realize the function of multi-channel infrared filtering by metal nanoresonator plasmonic metasurface alone. [0003] Moreover, the function of the all-dielectric resonator in the prior art is limited on a small scale, so it is difficult to squeeze light to the deep subwavelength scale. [0004] Therefore, it is necessary to provide a metasurface multi-channel infr...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a nanocomposite resonant cavity periodic array metasurface multi-channel infrared filter, to solve the problem that the single metal nano resonator plasma metasurface is difficult to realize the function of multi-channel infrared filtering and the all-dielectric resonant cavity in the prior art Difficult to squeeze light down to the deep subwavelength scale problem

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