A Thin Film Broadband Absorber Based on Multi-sized Nanoantennas
Yanxia Cui, Jun Xu, Kin Hung Fung, Yi Jin, Anil Kumar, Sailing He, and, Nicholas X. Fang
TL;DR
This paper presents an experimental design of an infrared broadband absorber using an array of multi-sized nanoantennas, achieving wide-angle absorption for TM polarized light through collective magnetic responses.
Contribution
The study introduces a novel nanoantenna array with varied sizes to achieve broadband infrared absorption, demonstrating effective design and wide-angle performance.
Findings
Broadband absorption validated experimentally
Effective for wide angular range
Utilizes collective magnetic responses
Abstract
We experimentally demonstrate an infrared broadband absorber for TM polarized light based on an array of nanostrip antennas of several different sizes. The broadband property is due to the collective effect of magnetic responses excited by these nano-antennas at distinct wavelengths. By manipulating the differences of the nanostrip widths, the measured spectra clearly validate our design for the purpose of broadening the absorption band. The present broadband absorber works very well in a wide angular range.
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