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arXiv 1611.09693physics.optics
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三维光子晶体中布儒斯特角位移随波长变化的观测

Observation of wavelength-dependent Brewster angle shift in 3D photonic crystals

Priya, Rajesh V. Nair

摘要:

由于光子晶体表面的亚波长特性和晶体内部折射率的周期性变化,偏振光与光子晶体的相互作用具有独特的性质。在这里,我们提出了一个详细的研究与三维光子晶体与面心立方对称的光散射的偏振各向异性在一个广泛的波长和角度范围。偏振的各向异性导致在传统的布儒斯特角定义的具有一定的折射率的平面界面的移位。观察到的布儒斯特角的偏移强烈地依赖于折射率对比度和晶格常数。对具有不同折射率对比度和晶格常数的光子晶体进行了偏振相关的禁带测量。这些测量结果表明,独特的停止间隙分支在高对称点的布里渊区的光子晶体。TE极化时观察到了固有的阻隙分支,而TM极化时由于布鲁斯特效应而被抑制。我们的结果有后果的偏振光散射等离子体结构和介电元表面,也是有用的应用,如纳米级偏振分裂器和激光器。

英文摘要:

The interaction of polarized light with photonic crystals exhibit unique features due to its sub-wavelength nature on the surface and the periodic variation of refractive index in the depth of the crystals. Here, we present a detailed study of polarization anisotropy in light scattering associated with three-dimensional photonic crystals with face centered cubic symmetry over a broad wavelength and angular range. The polarization anisotropy leads to a shift in the conventional Brewster angle defined for a planar interface with certain refractive index. The observed shift in Brewster angle strongly depends on the index contrast and lattice constant. Polarization-dependent stop gap measurements are performed on photonic crystals with different index contrast and lattice constants. These measurements indicate unique stop gap branching at high-symmetry points in the Brillouin zone of the photonic crystals. The inherited stop gap branching is observed for TE polarization whereas that is suppressed for TM polarization as a consequence of Brewster effect. Our results have consequences in the polarized light-scattering from plasmonic structures and dielectric meta-surfaces and are also useful in applications like nano-scale polarization splitters and lasers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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