We present the simulation, fabrication, and characterization of a dual-band metamaterial absorber in the mid-infrared regime. Two pairs of circular-patterned metal–dielectric stacks are employed to excite the dual-band absorption peaks. Dielectric characteristics of the dielectric spacing layer determine energy dissipation in each resonant stack, i.e., dielectric or ohmic loss. By controlling material parameters, both two mechanisms are introduced into our structure. Up to 98% absorption is obtained at 9.03 and 13.32 μm in the simulation, which is in reasonable agreement with experimental results. The proposed structure holds promise for various applications, e.g., thermal radiation modulators and multicolor infrared focal plane arrays.
© 2013 Optical Society of America
Original Manuscript: December 26, 2012
Revised Manuscript: February 26, 2013
Manuscript Accepted: March 1, 2013
Published: March 26, 2013
Nan Zhang, Peiheng Zhou, Dengmu Cheng, Xiaolong Weng, Jianliang Xie, and Longjiang Deng, "Dual-band absorption of mid-infrared metamaterial absorber based on distinct dielectric spacing layers," Opt. Lett. 38, 1125-1127 (2013)