4 January 2008 Diffraction from grating surfaces of a negative index metamaterial
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Abstract
We discuss the diffraction of waves due to the periodically corrugated boundary of vacuum and a linear, homogeneous negative refraction index metamaterials (NIM). We show by numerical simulation that the grating surfaces can give rise to a well-defined diffracted beam in addition to the negatively refracted beam. The direction of the diffracted beam is consistent with elementary diffraction theory; however, the coupling to this higher order beam is much larger than would be the case for a positive index material (PIM). To explore the properties of diffracted beams in a negative-index sample, we simulate a wave incident on the interface between a NIM grating and free space. The numerical study provides an indication of the relative coupling of the incident wave to the zeroth and first order beams.
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Min Cheng, Min Cheng, Yingwu Zhou, Yingwu Zhou, Yuliang Li, Yuliang Li, Xiyao Chen, Xiyao Chen, Xuemei Li, Xuemei Li, Qinxuan Huang, Qinxuan Huang, } "Diffraction from grating surfaces of a negative index metamaterial", Proc. SPIE 6832, Holography and Diffractive Optics III, 68321W (4 January 2008); doi: 10.1117/12.756113; https://doi.org/10.1117/12.756113
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