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Free-space carpet-cloak based on gradient index photonic crystals in metamaterial regime

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4 Author(s)
Yin, Ming ; State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China ; Yong Tian, Xiao ; Xue Han, Hao ; Chen Li, Di

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A free-space broadband carpet-cloak, designed based on transformations optics and quasi-conformal mapping, was realized with all-dielectric gradient index rod-connected diamond-structured photonic crystals (PCs) in metamaterial regime. Complex three-dimensional sample with smooth continuous changing unit cells was fabricated precisely by stereolithography (SL) using photo-curable resin. Thus, by gradually varying the unit cell constitutive parameters of the diamond-based PCs with nearly isotropic properties, the required complex spatial distribution of the refractive index profile was ideally achieved to reduce the scattering of the electromagnetic wave. The non-resonant property of the sub-wavelength PCs unit cell resulted in broad bandwidth and relatively low loss.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 12 )

Date of Publication:

Mar 2012

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