Polygonal Metallic Structure for Electromagnetic Wave Transmittance
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Solution Overview
Problem
Conventional opto-electronic apparatuses with dielectric materials have limited transmittance and spectral filtering efficiency for electromagnetic waves, as they only allow a small fraction of incoming waves to pass through due to the small area of subwavelength holes in metal films.
Innovation Solution
An opto-electronic apparatus with a metallic structure comprising multiple metallic blocks arranged in a polygon shape, where the centers of mass define the polygon, enhancing transmittance and polarization by optimizing the area, side lengths, and widths of the blocks to achieve higher transmission efficiency and specific filtering effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If subwavelength holes in metal film are used to enhance electromagnetic wave transmittance, then the intensity of transmitted waves can be higher than that impinging on the holes, but the overall transmitted intensity is only a small fraction (less than 10%) of the incoming electromagnetic waves because the total area of the holes is much smaller than the overall area irradiated
Solution Approach 1:
The invention divides the metallic structure into multiple discrete metallic blocks arranged in a polygonal pattern rather than using a continuous metal film with holes. This segmentation allows the electromagnetic waves to pass through the spaces between blocks while still interacting with the metallic structures, achieving both high transmittance and effective filtering/polarization.
Solution Approach 2:
Instead of creating holes in a continuous metal film (subtractive approach), the invention uses a complementary approach by arranging discrete metallic blocks in a polygonal configuration. This inversion allows the structure to achieve high transmittance by design rather than by exception, with the metallic blocks defining the transmission characteristics through their arrangement rather than by blocking light through holes.
2Reliability
If conventional dielectric materials are used for filtering and polarization, then the materials can interact with electromagnetic waves, but the transmittance is limited and spectral filtering efficiency is low
Solution Approach 1:
The invention combines metallic materials with specific geometric arrangements (polygonal configurations of metallic blocks) to create a composite opto-electronic structure. This composite approach leverages the unique electromagnetic interaction properties of metals at specific geometries to achieve both high transmittance and effective spectral filtering, overcoming the limitations of conventional dielectric materials.
Solution Approach 2:
The invention optimizes specific geometric parameters of the metallic blocks including the area of the polygon (A ≤ λ²), minimum side length (dmin ≤ λ), and averaged width of metallic blocks (0.01λ ≤ W ≤ 0.5λ) to achieve resonant interaction with electromagnetic waves at desired wavelengths. These parameter optimizations enable simultaneous achievement of high transmittance and effective filtering by tuning the structure to resonate with specific wavelength ranges.
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 apparatus achieves increased transmittance and effective polarization of electromagnetic waves, with transmittance peak values exceeding 20% and a narrow spectrum half width, significantly improving filtering and polarization capabilities compared to conventional designs.
Implementation Method 1
it is found by scientists that the transmittance of electromagnetic waves can be enhanced through subwavelength holes in the metal film
Implementation Method 2
The materials and devices capable of color filtering or polarization provide important functionality in electro-optical systems
Implementation Method 3
the transmittance of electromagnetic waves can be enhanced through subwavelength holes in the metal film
Implementation Method 4
Filtering of specific frequency spectrum or polarization is a basic operation on electromagnetic waves
Data Source
AI summary
An opto-electronic apparatus with a metallic structure is provided, and includes a light-permissible medium and a metallic structure. The metallic structure is disposed inside or over the light-permissible medium, and is formed from arrangement of at least one metallic unit. Each metallic unit includes at least three metallic blocks of which centers of mass define a polygon. After passing through the metallic structure, an electromagnetic wave has a distribution curve of transmittance versus wavelength, wherein the distribution curve has at least one transmittance peak value corresponding to at least one wavelength in a one-to-one manner. The area of the polygon is smaller than or equal to λ2, the minimum side length (dmin) is smaller than or equal to λ, and an averaged width (W) satisfies the following relationship: 0.01λ<W<dmin, in which λ represents one of the aforementioned at least one wavelength.