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Dual-band infrared perfect absorber based on asymmetric T-shaped plasmonic array
Optics Express
|June 13, 2014
Summary
We developed an infrared dual-band perfect absorber using an asymmetric T-shaped plasmonic array. This tunable device achieves two distinct absorption peaks, ideal for advanced infrared applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Metamaterials
Background:
- Perfect absorbers are crucial for various optical applications.
- Plasmonic structures offer unique light-matter interaction properties.
Purpose of the Study:
- To design and numerically investigate an infrared dual-band perfect absorber.
- To achieve tunable absorption peaks using localized surface plasmon polariton (LSPP) modes.
Main Methods:
- Numerical investigation of an asymmetric T-shaped plasmonic array.
- Analysis of absorption peaks based on LSPP modes.
- Tuning of absorption peaks by structural geometry modification.
Main Results:
- Achieved two distinct absorption peaks with a dual-band perfect absorber.
- Demonstrated tunability of absorption peaks by varying structural geometry.
- Suppressed multiple LSPP peaks for low sideband absorption.
Conclusions:
- The proposed T-shaped plasmonic array functions as an effective dual-band perfect absorber.
- The device offers independent tuning of absorption peaks.
- Potential applications include infrared imaging, thermal bolometers, and wavelength selective radiators.
