Disorder-based polarization-independent angle-variable tuning local optical filter and design method thereof

Abstract

The invention discloses a disorder-based polarization-independent angle-variable tuning local optical filter and a design method thereof. Continuous tuning of channel wavelengths is realized through changing the incidence angle of light, and the channel wavelengths are independent from polarization. The design of the local optical filter is based on any one non-zero incidence angle, the disorder of a reflector-cavity structure is adjusted, and orthogonal polarization intensity separation degrees are adopted as the criterion of a disorder adjustment effect; based on a plurality of optimization processes of the disorder of the reflector-cavity structure, orthogonal polarization intensity separation degrees at the channel wavelengths are all close to 0, and orthogonal polarization intensity separation degrees at extra-channel wavelengths are all close to 1; as for transmission performance, orthogonal polarization transmittances at the channel wavelengths are all close to 1, and orthogonal polarization transmittances at the extra-channel wavelengths are all close to 0; and the reflector-cavity structure is at least corresponding to one kind of physical realization of a layered medium structure and can satisfy the requirements of different application situations.

Description

technical field [0001] The invention belongs to the field of optical filters, in particular to a disorder-based polarization-independent variable-angle tuning local optical filter and a design method thereof. Background technique [0002] Traditional narrow-band optical filters include multiple isotropic dielectric layers with one or more filtering channels. The filter channel wavelength decreases as the incident angle of light increases. According to the corresponding relationship between the channel wavelength of the filter and the incident angle of light, the traditional narrow-band optical filter can be used as a variable-angle tuning filter, see literature [1]. However, since the reflection coefficient of the medium interface to p-polarized light and s-polarized light is different when the incident angle is not 0, there is a deviation between the wavelength of the p-polarized channel and the wavelength of the s-polarized channel. The main limiting factor for practical...

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Problems solved by technology

[0003] The present invention provides a disorder-based polarization-independent variable-angle tunable local filter and its design method, the purpose of which is to overcome the problem that the channel wavelength tuning of the existing variable-angle tunable filter is related to the polarization of incident light

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