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Optical response to the linear and circular polarized light of the double-spirals structure

机译:对双螺旋结构的线性和圆形偏振光的光学响应

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The optical response to the linear and circular polarized light of the double-spirals structures are investigated by the finite element simulation in this paper. For the linear polarized light the double-spirals structures are like a linear polarizer in the long wavelength region with the wavelength of 900-1500 nm, which corresponds to the standing-wave mode of a single spiral. The double-spirals structures have evident chiral effect in the long wavelength, and has 3-4 circular dichroism (CD) peaks in the wavelength range 850-1500 nm. For all structures investigated in this paper, the CD spectra have obvious blue shift with the increase of the arm width. The simulation results also indicate that the smaller the distance between the two spirals, the more the chiral effect of the double-spirals structures. The chiral effect for both structures with the distance of 400 nm diminishes, and both structures no longer have typical CD spectra.
机译:本文通过有限元模拟研究了双螺旋结构对线偏振和圆偏振的光学响应。对于线性偏振光,双螺旋结构就像在波长为900-1500 nm的长波长区域中的线性偏振器,它对应于单个螺旋的驻波模式。双螺旋结构在长波长中具有明显的手性效应,并在850-1500 nm波长范围内具有3-4个圆二色性(CD)峰。对于本文研究的所有结构,CD光谱都随着臂宽的增加而出现明显的蓝移。仿真结果还表明,两个螺旋之间的距离越小,双螺旋结构的手性效应越大。距离为400 nm的两种结构的手性效应均减小,并且两种结构不再具有典型的CD光谱。

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