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A long-pass filter with multiple nano-pillar arrays

A nano-column array and optical filter technology, which is applied in the direction of optical filters, optics, optical components, etc., can solve the problems of limited application and low efficiency

Active Publication Date: 2022-07-29
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been found that these plasmon-based cut-off filters are inefficient due to unavoidable metal loss
In addition, due to the natural properties of surface plasmon resonances, these filters cannot work at large incident angles, which greatly limits their applications

Method used

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  • A long-pass filter with multiple nano-pillar arrays
  • A long-pass filter with multiple nano-pillar arrays
  • A long-pass filter with multiple nano-pillar arrays

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Embodiment Construction

[0036] The present invention will be further explained below in conjunction with the accompanying drawings.

[0037] like Figure 9 to Figure 12 As shown, a multi-nano-pillar array long-pass filter is composed of wavy subwavelength metasurface units arranged in an array, and the wavy subwavelength metasurface unit includes a substrate and a metasurface structure arranged on the substrate. The structure is composed of two rows of "V" type inverted wavy structures and two rows of "Λ" type positive wave structures arranged at equal intervals in order from independent GaAs nano-cylinders.

[0038] Among them, in the "V"-shaped inverted wavy structure, the reference cylinder is located in the middle position, and the GaAs nanocylinders extend along both sides of the x-axis in an arithmetic progression, and extend up along the z-axis; in the "Λ"-shaped positive wavy structure , the reference cylinder is located at both ends, extending in the middle along the x-axis in the same arit...

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Abstract

The invention discloses a multi-nano-column array long-wave-pass filter, which is composed of wave-type subwavelength metasurface units arranged in an array. The wave-type subwavelength metasurface unit includes a substrate and a metasurface structure arranged on the substrate. The surface structure is composed of two rows of "V"-shaped inverted wave structures and two rows of "Λ"-shaped positive wave structures, which are formed by independent GaAs nano-cylinders arranged at equal intervals. Plane wave incident light is incident vertically from top to bottom. The invention designs a long-wave-pass filter formed by a brand-new structure of multiple nano-column arrays. The average transmittance of the long-wave filter in the short waveband is lower than 1%, and the average transmittance in the long waveband can be reached more than 97%. Specifically, the holding structure has extremely high transmittance in the long wavelength band of 650-2000 nm and extremely low transmittance in the short wavelength band of 200-450 nm.

Description

technical field [0001] The present invention relates to a long wavelength pass filter. Background technique [0002] Optical filter is an optical device used to select the desired wavelength band. At present, there are three mature processes for making traditional optical filters: the first is to coat a layer of optical film specially designed according to requirements on special optical glass. Layer, this process can meet different needs to achieve personalized production. But in addition to silicon dioxide (SiO 2 ) as the base material, other types of ultra-low refractive index materials have weak mechanical properties, which greatly limit their application scenarios. The second process is to use colored glass to make filters, which is simple to operate, low cost, and aesthetically pleasing. However, dye filters have larger pixels and poor imaging properties. At the same time, because the production method of colored glass is to add specific dyes to the glass, this res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/20G02B5/22
CPCG02B5/201G02B5/208G02B5/22
Inventor 余跃钱沁宇王钦华
Owner YANGZHOU UNIV
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