Open AccessGeneral design method of ultra-broadband perfect absorbers based on magnetic polaritons
Author(s) -
Yuanbin Liu,
Jun Qiu,
Junming Zhao,
Linhua Liu
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.00a980
Subject(s) - optics , broadband , polarization (electrochemistry) , ray , wavelength , rigorous coupled wave analysis , materials science , plasmon , physics , optoelectronics , diffraction grating , chemistry
Starting from one-dimensional gratings and the theory of magnetic polaritons (MPs), we propose a general design method of ultra-broadband perfect absorbers. Based on the proposed design method, the obtained absorber can keep the spectrum-average absorptance over 99% at normal incidence in a wide range of wavelengths; this work simultaneously reveals the robustness of the absorber to incident angles and polarization angles of incident light. Furthermore, this work shows that the spectral band of perfect absorption can be flexibly extended to near the infrared regime by adjusting the structure dimension. The findings of this work may facilitate the active design of ultra-broadband absorbers based on plasmonic nanostructures.