In this Letter, we demonstrate experimentally that a patchwork of four metal–insulator–metal patches leads to an unpolarized wideband omnidirectional infrared absorption. Our structure absorbs 70% of the incident light on a 2.5 μm bandwidth at 8.5 μm. It paves the way to the design of wideband efficient plasmonic absorbers in the infrared spectrum.
© 2012 Optical Society of America
Diffraction and Gratings
Original Manuscript: January 6, 2012
Revised Manuscript: January 31, 2012
Manuscript Accepted: February 1, 2012
Published: March 8, 2012
Patrick Bouchon, Charlie Koechlin, Fabrice Pardo, Riad Haïdar, and Jean-Luc Pelouard, "Wideband omnidirectional infrared absorber with a patchwork of plasmonic nanoantennas," Opt. Lett. 37, 1038-1040 (2012)