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Optics Letters
|July 30, 2016
Summary
We developed a narrow-band plasmonic absorber using dielectric resonators (DRs) for efficient light absorption at visible frequencies. This novel design achieves over 90% absorption, paving the way for advanced optical applications.
Area of Science:
- Photonics and Nanotechnology
- Materials Science
Background:
- Plasmonic absorbers are crucial for light harvesting and sensing applications.
- Achieving narrow-band absorption with high efficiency remains a challenge.
Purpose of the Study:
- To demonstrate a narrow-band plasmonic absorber using dielectric resonators (DRs) on a metallic substrate.
- To achieve efficient light absorption at visible frequencies.
Main Methods:
- Fabrication of a uniform array of nanoscale cylindrical dielectric resonators (DRs) on a metallic substrate.
- Excitation with normally incident plane waves.
- Analysis using coupled mode theory and numerical simulations.
Main Results:
- Demonstrated a narrow-band plasmonic absorber with perfect absorption at 633 nm (simulation) and 90% absorption at 636 nm (measurement).
- Achieved a relative bandwidth of 1.8% with >90% absorption.
- Investigated the dependence of absorption on resonator size, period, and incidence angle.
Conclusions:
- The proposed dielectric resonator array effectively functions as a narrow-band plasmonic absorber.
- The study validates the design through simulation and experimental measurements, analyzed by coupled mode theory.
