Dual-Layer Wire Grid Polarizer for High Efficiency
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Solution Overview
Problem
Conventional polarizers have low light use efficiency due to absorption, and existing wire grid polarizers require advanced technologies like laser lithography for production, limiting their scalability and performance in the visible ray region.
Innovation Solution
A wire grid polarizer with a double layer structure, comprising alternating first and second conductive metallic wires on a light transmitting substrate with a specific interlayer thickness and fill factor, allowing for efficient light transmission and reflection across the visible spectrum without the need for nanoscale fabrication techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single layer wire grid polarizer is used, then the manufacturing precision requirement is high (period < 100 nm), but the device complexity is low
Solution Approach 1:
The single layer wire grid structure is divided into two separate layers. Each layer has a period of about 200 nm (coarser than the original <100 nm requirement), making manufacturing easier. The two layers work together to achieve the polarization function that previously required a single fine-pitch layer.
Solution Approach 2:
The solution transitions from a two-dimensional single-layer grid to a three-dimensional dual-layer structure with an interlayer in between. This adds a vertical dimension (z-axis) to the design, allowing each layer to operate at a relaxed pitch while maintaining overall polarization performance through the stacked configuration.
2Device complexity
If absorptive polarizers are used, then the device complexity is low, but the light use efficiency is low
Solution Approach 1:
Both layers use identical conductive material and similar geometric patterns, creating a homogeneous structure that consistently reflects polarized light across the visible spectrum. This uniformity ensures efficient light management without the losses associated with absorptive materials.
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 double layer wire grid polarizer achieves high contrast ratios and throughput, enabling efficient light management and improved brightness in applications like LCDs and projectors, while being easier to fabricate than conventional designs.
Implementation Method 1
light polarized parallel to the metallic wires 12 (S-polarized light) is reflected
Implementation Method 2
light polarized parallel to the metallic wires 12 (S-polarized light) is reflected, and light polarized perpendicular to the metallic wires 12 (P-polarized light) is transmitted
Implementation Method 3
a light transmitting interlayer arranged on the plurality of first conductive metallic wires
Data Source
AI summary
Provided are a wire grid polarizer having a double layer structure, with two metallic wire layers, and a method of fabricating the same. The wire grid polarizer having a double layer structure includes: a light transmitting substrate; a plurality of first conductive metallic wires arranged on the light transmitting substrate parallel to one another at a predetermined period; a light transmitting interlayer arranged on the first conductive metallic wires; and a plurality of second conductive metallic wires arranged on the light transmitting substrate parallel to one another at a predetermined period, wherein the first conductive metallic wires and the second conductive metallic wires are arranged alternately.