Polarizing Element Structure for Waveplate-Free Polarization Rotation
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Solution Overview
Problem
Existing waveplates require complex processing of fine irregularities to control polarization of multiple optical signals in wavelength division multiplexing, which is inefficient and difficult to achieve.
Innovation Solution
A polarizing element comprising liquid-crystal polymer members arranged at regular intervals with an aspect ratio less than 1, combined with an isotropic member, to rotate polarization without requiring fine processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waveplate is used to control polarization of multiple optical signals, then polarization control is achieved, but fine irregularities require complex processing
Solution Approach 1:
The patent changes the geometric parameters of the liquid crystal polymer members, specifically setting the aspect ratio (height to pitch) to less than 1. This parameter change allows the members to be arranged in a staggered pattern that achieves polarization control without requiring fine irregularities, thus resolving the contradiction between reliable polarization control and ease of manufacture
Solution Approach 2:
The patent uses a composite structure combining liquid crystal polymer members with an isotropic member (such as resin or glass). This composite approach allows the liquid crystal polymer members to provide polarization control while the isotropic member provides structural support, eliminating the need for complex fine processing while maintaining reliability
2Ease of manufacture
If liquid-crystal polymer members are arranged at regular intervals, then polarization control is simplified, but aspect ratio constraints must be met
Solution Approach 1:
The patent defines a specific parameter range for the aspect ratio (height to pitch) to be less than 1, which simplifies the manufacturing process by allowing regular interval arrangement while maintaining manufacturability. This parameter constraint transforms a potential precision challenge into a straightforward design guideline
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polarizing element achieves efficient polarization control with high transmittance and reliability, reducing signal loss and processing complexity, suitable for wavelength selective switches.
Implementation Method 1
a birefringence zone in which polarization of incident light is rotated
Data Source
AI summary
A polarizing element including: a first planar member transparent to light; liquid-crystal polymer members provided on a surface of the first planar member so as to extend in one direction at a regular interval having a predetermined pitch along the surface of the first planar member; and an isotropic member provided on the surface of the first planar member so as to contain the liquid-crystal polymer members, in which an aspect ratio is smaller than 1, the aspect ratio being a ratio of a height of each of the liquid-crystal polymer members to 1/2 times the pitch between two of the liquid-crystal polymer members adjacent to each other.