Experimental demonstration of Luneburg lens based on hyperuniform disordered media

Hyperuniformity provides a means of categorizing many nanostructures including nano-composite materials, and the design methodology based on hyperuniform randomness often leads to devices with extraordinary characteristics. In this work, we numerically and experimentally demonstrate that a Luneburg lens made of hyperuniform disordered composite materials can dramatically reduce back scattering in comparison with its counterpart design based on periodic metamaterials. Two sample Luneburg lenses made of scatterers with hyperuniform disordered and periodic distributions have been designed and fabricated, respectively. Measurements are carried out in a two-dimensional near-field microwave scanning apparatus. Both experimental and simulation results agree with theoretical prediction demonstrating almost identical in-band focusing but rather contrast out-of-band wave scattering characteristics.