THz Polarizer With Discontinuous Conductive Layer on Cyclic Olefin Substrate
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Solution Overview
Problem
Current polarizers for electromagnetic radiation in the THz spectral range have limited polarization efficiency, as indicated by a low polarization extinction ratio, which hinders their effectiveness in applications such as spectroscopy and security screening.
Innovation Solution
A polarizer design featuring a substrate with a cyclic olefin polymer or copolymer substrate having a discontinuous electrically conductive layer, where the layer covers the bottom and top surfaces of trenches but not the sidewalls, enhancing the polarization extinction ratio. The electrically conductive layer can be made of gold, silver, aluminum, or copper, and the trenches have specific dimensions to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a continuous electrically conductive layer is used in conventional polarizers, then the manufacturing process is simpler, but the polarization extinction ratio is limited and cannot be sufficiently improved
Solution Approach 1:
The electrically conductive layer is segmented into discrete portions that fill the trenches and cover the top surface, rather than forming a continuous layer. This segmentation allows the conductive structures to interact with electromagnetic radiation in a way that significantly improves the polarization extinction ratio, achieving over 30 dB across the THz frequency range.
Solution Approach 2:
The electrically conductive layer is strategically positioned only in specific locations: within the trenches and on the top surface connecting adjacent trenches, while deliberately absent from the sidewall regions. This local quality distribution optimizes the interaction with EM radiation for polarization filtering while maintaining manufacturing feasibility.
2Adaptability or versatility
If a rigid substrate is used for the polarizer, then the structural stability is better, but the polarizer cannot be integrated on curved surfaces
Solution Approach 1:
The substrate is implemented as a thin film made from cyclic olefin polymer (COP) or cyclic olefin copolymer (COC), which provides inherent flexibility. This flexible thin film substrate can be conformally integrated onto curved surfaces such as optical elements, while maintaining the structural integrity needed to support the trench and conductive layer structures.
3Manufacturing precision
If the electrically conductive layer covers the sidewall surfaces of trenches, then the coverage is more complete, but the polarization extinction ratio is reduced
Solution Approach 1:
The electrically conductive layer is extracted from the sidewall regions of the trenches, deliberately omitting coverage in these areas. This extraction of the conductive material from specific locations (sidewalls) while maintaining it in others (trench bottoms and top surface) creates the optimal configuration for achieving high polarization extinction ratio through enhanced electromagnetic radiation interaction.
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 design results in a polarizer with improved polarization efficiency, as demonstrated by increased polarization extinction ratio across the THz frequency range, and allows for flexibility in integration on curved surfaces due to the use of cyclic olefin polymers.
Implementation Method 1
the electrically conductive layer is a discontinuous layer covering a bottom surface of a trench and a top surface connecting two consecutive trenches
Implementation Method 2
Polarizers are components which are designed to transmit a specific polarization component of EM radiation to block (via, e.g., absorption or reflection) EM radiation of a polarization component orthogonal to that specific polarization component
Implementation Method 3
A further possible associated advantage of using a substrate comprising COP and/or COC is that the substrate may be more flexible and may therefore be incorporated on curved surfaces
Data Source
Figure 1~2
Figure 3A~3C
AI summary
The present inventive concept relates to a polarizer (10) for electromagnetic radiation having a frequency within a range from 0.1 to 25 THz. The polarizer (10) comprises: a substrate (100) comprising a cyclic olefin polymer and/or a cyclic olefin copolymer, wherein a plurality (120) of trenches is formed on an area of a first major surface (102) of the substrate (100), the trenches (120) extending in parallel along the first major surface (102); and an electrically conductive layer (110) covering at least a portion of the area of the first major surface (102), wherein the electrically conductive layer (110) is a discontinuous layer covering a bottom surface (124a) of a trench (120a) and a top surface (104b) connecting two consecutive trenches (120a, 120b).