研究目的
Investigating the feasibility to improve the response of quantum type infrared detectors by applying surface plasmons.
研究成果
Broadband absorption enhancements of 30–40% are achievable in standard HgCdTe infrared detectors using plasmonic structures, enabling improved pixel-level functionalities and cost reduction in high-performance IR imaging systems with multicolour capabilities.
研究不足
The study is based on computational simulations, not experimental validation; potential fabrication challenges and real-world performance variations are not addressed.
1：Experimental Design and Method Selection:
Numerical simulations using the finite element method (FEM) to solve 3D full-wave Maxwell equations with perfectly matched layer boundary conditions and periodic boundary conditions for a rectangular lattice. Plane waves perpendicular to the detector surface are used for excitation.
2：Sample Selection and Data Sources:
The detector structure imitates a basic long-wavelength infrared detector with an HgCdTe absorber (x ≈ 0.2) of several micrometers thickness sandwiched between CdTe layers. Plasmonic structures made of gold, silver, and copper are assembled on a top CdTe layer of 30–50 nm thickness. Material parameters (dispersive permittivity) are obtained from references [4–6].
3：2) of several micrometers thickness sandwiched between CdTe layers. Plasmonic structures made of gold, silver, and copper are assembled on a top CdTe layer of 30–50 nm thickness. Material parameters (dispersive permittivity) are obtained from references [4–6].
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Simulation software (Comsol Multiphysics), materials include HgCdTe, CdTe, gold, silver, copper.
4：Experimental Procedures and Operational Workflow:
Simulations are performed to calculate the time-average spectral power density absorbed in the detector volume using Equation (1), where E is the electric field, ω is angular frequency, and ε(ω) is permittivity.
5：Data Analysis Methods:
Absorption enhancement is calculated as the ratio of power absorbed with plasmonic structures to without, and scattering cross sections are analyzed.
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