Wire-grid metal sheet for terahertz polarizers
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Solution Overview
Problem
Existing wire grids for terahertz waves are difficult to produce due to breakage and variations in metal strip alignment, making them expensive and prone to manufacturing challenges, and they often require additional steps to account for substrate or base material effects that cause multiple reflections or interference.
Innovation Solution
A free-standing wire-grid metal sheet made of metal only, featuring longitudinally extending strip-shaped members and cross members arranged in a lattice pattern with the cross members spaced at least five times greater than the longitudinal members, which can be processed using punching or etching to reduce breakage and variations, and is supported by an annular frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If long and thin metal strips are arranged in parallel to form a wire grid, then the polarizing function for terahertz waves is achieved, but tension causes breakage of the metal strips and variations in distances between adjacent metal strips
Solution Approach 1:
The wire grid structure is divided into modular units with a specific number of metal strips (e.g., 3-10 strips per unit) that are joined together. This segmentation reduces the overall length of individual strips, minimizing tension-induced breakage and alignment variations while maintaining the required polarizing function for terahertz waves.
Solution Approach 2:
Joining structures or intermediate components are introduced to connect multiple metal strip units. These intermediaries provide support and constraint points that prevent excessive tension on individual strips, reducing breakage and maintaining precise spacing between adjacent strips throughout the extended grid structure.
2Ease of manufacture
If substrate or base material is used to form wire grids, then manufacturing is simplified, but multiple reflections or interference occur depending on the physical property of the substrate
Solution Approach 1:
The metal strips are extracted from the substrate or base material configuration and arranged as free-standing elements in air or vacuum. This removes the substrate entirely, eliminating the source of multiple reflections and interference caused by substrate physical properties, while the strips are held in position by support structures that do not interfere with terahertz wave interaction.
Data Source
AI summary
A wire-grid metal sheet includes a grid portion defined by a plurality of spaced strip-shaped longitudinal members extending longitudinally and cross members extending substantially perpendicular to the longitudinal members. A wire grid is made by attaching the wire-grid metal sheet to a frame. The cross members are arranged at intervals at least about five times greater than those of the longitudinal members. The longitudinal members and the cross members may define a lattice pattern. Alternatively, the longitudinal members or the cross members may be arranged in a staggered manner.