A broadband and omnidirectional electromagnetic wave concentrator with gradient woodpile structure.
We present the first realized three-dimensional (3D) practical implementation of the so called "optical black hole" in microwave frequencies, an electromagnetic (EM) concentrator. The 3D EM wave concentrator was designed with non-resonant gradient index (GRIN) 3D woodpile photonic crystals (PCs) structure in metamaterial regime, and fabricated by Stereolithography (SL) process. Omnidirectional EM wave capture and absorbing ability of the device in a broad bandwidth (12GHz-15GHz) were validated by full-wave simulation and experiments. Such devices may have applications in microwave energy harvesting and radiation detector.
State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi'an, 710049, China.
Ming
M
Yin
Xiao Yong
XY
Tian
Ling Ling
LL
Wu
Di Chen
DC
Li