Polarization-insensitive terahertz ultra-wideband absorber with an actively tunable bandwidth
Bin Li,
Rui Meng,
Ya-Hui Hou
et al.
Abstract:This study presents a novel, to our knowledge, polarization-insensitive terahertz absorber with an actively adjustable bandwidth. The absorber consists of a vertically stacked three-layer structure with target-shaped resonant layers. Its absorption bandwidth is dynamically controlled, exhibiting ultra-broadband characteristics in the metallic phase. The absorber achieves over 90% absorption from 1.8 to 31.7 THz, with a relative bandwidth of 178%. In the insulating phase, the device transforms into a narrowband… Show more
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