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Opt Express. 2013 Aug 12;21(16):19082-90. doi: 10.1364/OE.21.019082.

A broadband and omnidirectional electromagnetic wave concentrator with gradient woodpile structure.

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State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi'an, 710049, China.


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.


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