Stacked Wire Grid Device for Terahertz Polarization
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Solution Overview
Problem
Conventional wire grid devices for polarizing or analyzing terahertz electromagnetic waves struggle to achieve an extinction ratio in the 10−6 class in terms of intensity transmittance, which is essential for high-performance terahertz applications.
Innovation Solution
A wire grid device is formed by stacking film substrates with elongated rectangular metal thin plates, where the interval between these plates determines the performance, allowing for a stable and constant interval even at large scales, and the thickness of the substrates can be adjusted to achieve the desired extinction ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional free-standing wire grid is used with metal thin lines aligned one by one, then the structure can be manufactured, but the applicable frequency is limited and fine structures for 1.5 THz or more are difficult to realize
Solution Approach 1:
The patent transitions from a two-dimensional planar wire grid to a three-dimensional stacked configuration of metal plates. By stacking multiple metal plates at regular intervals along the optical path, the invention achieves fine structural control for high-frequency terahertz waves (1.5 THz or more) while maintaining manufacturability through standard plate fabrication and stacking processes
2Manufacturing precision
If the width of vertical bridge parts is reduced to 1.5-50 μm to achieve fine structure, then the performance for high-frequency terahertz waves is improved, but the structural strength and stability deteriorate
Solution Approach 1:
The patent moves from thin-line two-dimensional structures to plate-like three-dimensional structures. By stacking metal plates with controlled widths (1.5-50 μm) at regular intervals, the invention maintains the fine structural dimensions needed for high-frequency performance while gaining structural stability through the three-dimensional stacked configuration and increased material volume
Solution Approach 2:
The patent creates a composite structure by stacking multiple metal plates separated by spacers. This composite configuration combines the fine dimensional control of individual plates with the structural strength of the stacked assembly, achieving both high manufacturing precision and mechanical stability for terahertz wave applications
3Strength
If the thickness of the metal plate is increased to 10 μm to ensure physical strength, then the structural stability is improved, but the extinction ratio performance deteriorates
Solution Approach 1:
The patent divides the single thick metal plate into multiple thinner plates stacked at regular intervals. This segmentation allows each individual plate to maintain appropriate thickness for structural strength while the combined stacked structure achieves the required extinction ratio performance through the cumulative effect of multiple interfaces and the controlled spacing between plates
Solution Approach 2:
The patent transitions from a single-plane thick plate to a multi-layer stacked configuration. By distributing the total thickness requirement across multiple thinner plates separated by spacers, the invention simultaneously achieves structural stability (through total thickness) and optical performance (through individual plate thickness and spacing), resolving the contradiction between strength and extinction ratio
4Device complexity
If a single metal plate is used to simplify the structure, then the device complexity is reduced, but the extinction ratio in 10−6 class cannot be achieved
Solution Approach 1:
The patent segments the optical function across multiple metal plates stacked in sequence. Each plate contributes to the overall extinction ratio, and the cumulative effect of multiple plates achieves the required 10−6 class performance. The segmentation is implemented through a modular stacking process that, while adding components, uses standardized elements and simple assembly procedures
Solution Approach 2:
The patent adds the stacking dimension to the traditional single-plate configuration. By arranging multiple plates along the optical path at regular intervals, the invention achieves high extinction ratio performance through the cumulative optical effect while maintaining relatively simple individual plate designs and straightforward stacking assembly
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 wire grid device effectively operates as a polarizer for terahertz light, achieving an extinction ratio in the 10−6 class, enhancing both yield and performance by maintaining a consistent interval and allowing frequency band changes through substrate thickness adjustments.
Implementation Method 1
the metal thin plates are arranged so as to overlap each other and parallel flat plates configured by the metal thin plates on corresponding ones of the film substrates form a wire grid operating as a polarizer for terahertz light
Data Source
AI summary
Achieve an extinction ratio in the approximate 10−6 class for intensity transmittance in the terahertz band with one element. A wire grid device configured from layering a plurality of film substrates each formed from a rectangular polymer film wherein a narrow rectangular metal thin plate is formed in the approximate center of one face thereof. By having the width of the metal thin plate be approximately 1.0 mm, the length of the metal thin plate be approximately 12.0-30 mm, and the thickness of the film substrate be approximately 0.5-50 μm, it is possible to easily achieve an extinction ratio in the approximate 10−6 class for intensity transmittance in the terahertz band with one element.