Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 45, Issue 20, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/45/20/205101
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Funding
- National Science Council of the Republic of China [NSC98-2811-M-018-012, NSC100-2120-M-009-008, NSC98-2112-M-018-004-MY3]
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The optical properties of a dual-band plasmonic absorber are delineated numerically by employing a finite element method. Based on a metal-dielectric-metal scheme, the key structure consists of a lossless dielectric layer that is sandwiched by a silver split square-ring enclosing a silver square array and ground silver plane. The simulation results clearly show that near-perfect absorption efficiency can be realized for two absorption bands in the near-infrared wavelength range. The near-perfect absorption bands exhibit polarization insensitivity and wide-angle incidence. Notably, the absorption band is independently governed by the size of each part of the patterned films where the silver split square-ring determines the shorter wavelength band and the silver square determines the longer wavelength band, respectively. The repositioning of two near-perfect absorption peaks possesses a linear relationship that is related to the dimensions of the patterned silver layer. This allows for a flexible reconfigurability over the entire near-infrared regime.
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