Wire Grid Polarizer Manufacturing via Electron Beam Deposition
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Solution Overview
Problem
The manufacturing process of wire grid polarizers is complex and prone to errors, such as wire grid collapse and non-uniform etching, making it difficult to produce large-sized and high-precision templates, which affects the polarization performance and industrial production.
Innovation Solution
A method involving setting pattern data for a wire grid structure, immersing a carrier substrate in a metal ion solution, and using an electron beam emitter to deposit metal according to the pattern data, with precise control of the electron beam diameter between 0.05 nm to 1 nm, to form the wire grid structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanoimprint technology is used to fabricate wire grid structure, then the wire grid polarizer can achieve high light transmittance and contrast ratio, but the manufacturing process becomes complicated and prone to defects such as wire grid collapse and non-uniform etching
Solution Approach 1:
The patent extracts and eliminates the photoresist printing and etching steps from the manufacturing process. Instead of using conventional nanoimprint technology that requires photoresist coating, patterning, and etching, the invention directly forms the wire grid structure through metal deposition, removing the problematic intermediate steps that cause process complexity and defects.
Solution Approach 2:
The patent replaces the mechanical and chemical etching process with a physical deposition process. Instead of using etchants to remove material and define the wire grid pattern, the invention uses controlled metal deposition to directly build the wire grid structure, substituting a simpler physical process for the complex mechanical-chemical etching sequence.
2Manufacturing precision
If conventional etching methods are used to create nanometer-scale wire grid, then the process can define the pattern, but the wire grid is prone to collapse and the etching is non-uniform, affecting manufacturing precision
Solution Approach 1:
The patent inverts the conventional approach by building the wire grid structure through deposition rather than removing material through etching. Instead of starting with a continuous layer and etching away the spaces between wires, the invention deposits metal to build the wires themselves, fundamentally reversing the manufacturing logic to achieve better precision and stability.
Solution Approach 2:
The patent changes the fundamental parameter of material removal versus material addition. By switching from etching (material removal) to deposition (material addition), the process achieves superior control over wire grid dimensions and uniformity, eliminating the collapse issues inherent in thin-walled etched structures.
3Manufacturing precision
If photoresist is used in the nanoimprint process, then the wire grid pattern can be defined, but the photoresist is liable to remain and the process becomes less suitable for industrial production
Solution Approach 1:
The patent extracts and eliminates the photoresist material and associated processing steps from the manufacturing flow. By using direct metal deposition, the invention removes the photoresist application, patterning, and removal steps, thereby eliminating photoresist residue issues and streamlining the process for industrial production.
Solution Approach 2:
The patent enables a continuous deposition process without the interruptive steps required by photoresist-based methods. The metal deposition can proceed continuously to form the wire grid pattern, eliminating the stop-start nature of photoresist processing and improving overall manufacturing throughput and efficiency.
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
This method simplifies the manufacturing process, improves precision, and facilitates industrial production of wire grid polarizers with high light transmittance and contrast ratio, suitable for large-scale production while maintaining high durability.
Implementation Method 1
emitting, by an emitter device, an electron beam to the carrier substrate, and controlling a movement of the electron beam according to the pattern data to deposit a metal on the carrier substrate at a position where the electron beam passes
Implementation Method 2
After the electron beam passes, the metal ions acquire electrons and are reduced to metal which is deposited in a position corresponding to the pattern data
Data Source
AI summary
A manufacturing method of a wire grid polarizer is provided, including: setting pattern data, where the pattern data correspond to a wire grid structure of the wire grid polarizer; preparing a metal ion solution; immersing at least one surface of a carrier substrate in the metal ion solution; and emitting, by an emitter device, an electron beam to the carrier substrate, and controlling a movement of the electron beam according to the pattern data to deposit a metal on the carrier substrate at a position where the electron beam passes, to form the wire grid structure.