Wideband perfect light absorber at midwave infrared using multiplexed metal structures.
We experimentally demonstrate a wideband near-perfect light absorber in the midwave IR region using a multiplexed plasmonic metal structure. The wideband near-perfect light absorber is made of two different size gold metal squares multiplexed on a thin dielectric spacing layer on top of a thick metal layer in each unit cell. We also fabricate regular nonmultiplexed structure perfect light absorbers. The multiplexed structure IR absorber absorbs more than 98% of the incident light over a much wider spectral band than regular nonmultiplexed structure perfect light absorbers in the midwave IR region.
Sensors Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, Ohio 45433, USA.
Joshua
J
Hendrickson
Junpeng
J
Guo
Boyang
B
Zhang
Walter
W
Buchwald
Richard
R
Soref