Plasmonic Structure Broadband Absorptivity via Coupled Modes
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Solution Overview
Problem
Conventional plasmonic structures have a narrow bandwidth of high absorptivity and emissivity, limiting their efficiency in energy utilization, as they primarily absorb and emit light in a specific wavelength range rather than a broader band.
Innovation Solution
A plasmonic structure is designed with a first conductor layer, a dielectric layer, and a second conductor layer stacked in order, where the second conductor layer features two-dimensionally and periodically arranged conductor patterns with circular or regular polygonal shapes, and specific dimensions to enhance absorptivity and emissivity across a wider wavelength band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional plasmonic structure is used, then high absorptivity and emissivity are achieved in a specific wavelength range, but the bandwidth of high absorptivity and emissivity is narrow
Solution Approach 1:
The patent combines diffraction mode and plasmon mode into a coupled mode by integrating a dielectric layer with periodic conductor patterns. This merging of two distinct optical modes creates a hybrid resonance that simultaneously achieves high absorptivity across a broad wavelength bandwidth, directly resolving the contradiction between narrow bandwidth and wavelength coverage
Solution Approach 2:
The invention uses a composite structure consisting of conductor layers, dielectric layers, and periodic conductor patterns. This composite material system enables the coupling of diffraction and plasmon modes, achieving broad bandwidth high absorptivity that neither material could achieve alone, thus expanding the wavelength band coverage while maintaining energy efficiency
2Loss of energy
If a plasmonic structure with specific conductor patterns is formed, then absorptivity and emissivity are enhanced, but the bandwidth of high absorptivity and emissivity remains narrow
Solution Approach 1:
The patent introduces dynamic tuning capability through adjustable parameters including dielectric layer thickness, conductor pattern geometry, and periodicity. By dynamically optimizing these parameters, the coupled diffraction-plasmon mode can be tuned to achieve high absorptivity across different wavelength bands, simultaneously improving energy utilization efficiency and radiation efficiency
Solution Approach 2:
The invention achieves broad bandwidth by systematically changing key parameters: optimizing the dielectric layer thickness to support coupled modes, adjusting conductor pattern dimensions and spacing to control resonance wavelengths. These parameter changes enable the structure to maintain high absorptivity and emissivity across an expanded wavelength range, resolving the contradiction between energy efficiency and radiation 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 configuration induces a mode where the diffraction and plasmon modes couple, widening the bandwidth of high absorptivity and emissivity, improving energy utilization efficiency by allowing light absorption and emission across a broader spectrum.
Implementation Method 1
a structure called a plasmonic structure has been proposed. The plasmonic structure is a structure that generates plasmon resonance due to light irradiation. Accordingly, an electric field is enhanced, and an amount of absorption of light increases.
Implementation Method 2
This configuration induces a mode where the diffraction and plasmon modes couple, widening the bandwidth of high absorptivity and emissivity
Data Source
AI summary
In a plasmonic structure, a first conductor layer, a dielectric layer, and a second conductor layer are stacked in this order. The second conductor layer includes a plurality of conductor patterns that is two-dimensionally and periodically arranged, each of the plurality of conductor patterns having a circular shape or a regular polygonal shape. A diameter D of a circle circumscribed on each of the plurality of conductor patterns satisfies 200 nm≤D≤800 nm. A thickness g of the dielectric layer and the diameter D satisfy 0.3≤g/D≤0.6.