Thin Film Absorbers Based on Plasmonic Phase Resonances

TL;DR

This paper presents a novel double-layer plasmonic structure that achieves high absorption efficiency and wide-angle insensitivity, with potential applications in solar cells, sensors, and infrared detectors.

Contribution

It introduces a new thin film absorber design based on plasmonic phase resonances with enhanced absorption and robustness to layer misalignment.

Findings

Achieves over 90% absorptivity in the proposed structure.

Exhibits wide-angle absorption characteristics.

Insensitive to layer alignment errors.

Abstract

We demonstrate an efficient double-layer light absorber by exciting plasmonic phase resonances. We show that the addition of grooves can cause mode splitting of the plasmonic waveguide cavity modes and all the new resonant modes exhibit large absorptivity greater than 90%. Some of the generated absorption peaks have wide-angle characteristics. Furthermore, we find that the proposed structure is fairly insensitive to the alignment error between different layers. The proposed plasmonic nano-structure designs may have exciting potential applications in thin film solar cells, thermal emitters, novel infrared detectors, and highly sensitive bio-sensors.