双层金属线平面手征结构的强旋光性和负折射率研究
Investigation on strong optical activity and negative refractive index in double-layer metallic wires planar chiral structure
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摘要: 提出一种由四重对称的金属线构成的双层平面手征结构,并对两层金属线之间旋转角θ和介质层厚度h进行了优化.数值模拟结果显示,在一定的θ和h下,该结构在近红外波段具有极强的旋光性和大的手征参数,且在一定的波段范围内具有负折射率.Abstract: A planar chiral structure composed of double-layer metallic wires with fourfold symmetry is proposed.The rotation angle and the dielectric layer thickness between double-layer metallic wires is optimized.The numerical simulation results show that the exceptionally strong polarization rotation and the large chiral parameter are found at the infrared wavelength,and show a negative refraction index in a certain band.
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