Polarization insensitivity liquid crystal photon crystal filter and making method thereof

Abstract

The invention provides a polarization insensitive liquid crystal photonic crystal filter and a manufacturing method thereof. The filter comprises three glass substrates, wherein, one internal glass substrate is positioned in the middle and two external glass substrates are positioned at the two sides of the internal glass substrate; the inner sides of the two external glass substrates and the twosides of the internal glass substrate are plated with ITO electrode films which are alternately plated with multilayer films of silicon dioxide and titanium dioxide; the multilayer films are printed with oriented films which are subject to directional friction treatment and cause the friction directions of the opposite glass substrates to be antiparallel and overlaid; isolation pads used for controlling the thickness of the liquid crystal layers are arranged among all glass substrates and pure nematic phase liquid crystals with larger anisotropism difference of refractive index are injected among all glass substrates; the two liquid crystal layers are arranged in an antiparallel manner respectively and the arrangement directions of the two layers are vertical; and the peripheries of the glass substrates are provided with a sealing structure. The crystal filter and the manufacturing method have the advantages of low cost, low driving voltage, large tuning range, high tuning precision and good repeatability, being easy to control, and the like.

Description

(1) Technical field [0001] The invention relates to a liquid crystal photonic crystal filter, in particular to a polarization-insensitive liquid crystal photonic crystal filter used in a dense wavelength division multiplexer system. The invention also relates to a preparation method of the liquid crystal photonic crystal filter. (2) Background technology [0002] In the modern information society, with the increasing amount of information to be transmitted, people's requirements for communication networks are also increasing. Dense wavelength division multiplexing (DWDM) technology is the best way to provide high-speed, large-capacity optical fiber communication systems. With the rapid development of DWDM in optical communication systems, the number of channels that a single optical fiber needs to accommodate is increasing. In order to Multiplexers and demultiplexers must be used to process a certain wavelength in multiple channels. At present, there are many ways to reali...

AI Technical Summary

Problems solved by technology

In short, due to the use of polarized light, the following problems will occur: 1. It will reduce the signal energy and affect the transmission distance; 2. Increase the complexity of the system, making the system difficult to implement; 3. Reduce the use range of liquid crystal photonic crystal filters

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