We report on an existence of a highly lossy interface mode (HLIM) in a designed plasmonic nanostructure for perfect absorption of the incident optical waves. Interactions between the single thin- metallic-layer (TML) and slits arrays for excitation of the HLIM in the proposed plasmonic absorber are investigated, and eigenfrequency formula for the HLIM is derived. Analytical and numerical results show that the HLIM is frequency-selective, opens a narrow and steep absorption band in photonic stopband of the slits arrays. Due to the HLIM lossy characteristic, surface plasmon polaritons are signi¯cantly trapped at the TML interface with absorption close to 100%.
|Pages (from-to)||511 - 525|
|Number of pages||14|
|Journal||Progess in Electromagnetics Research|
|Publication status||Published - 13 Feb 2012|