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同轴纳米环结构由于具有特殊的光学特性,近年来引起了科学界的广泛关注.本文将重点研究在以纳米环形结构为基础的法布里-珀罗腔中所存在的两种形式的表面等离子共振,平面型和传输型.通过使用固定圆环阵列的周期而只改变圆环孔径大小的方法来实现调节传输型共振并达到滤波的效果.同时,控制圆环阵列的周期使其足够大,从而使得平面型共振峰位于近红外波段,以避免对处于可见光波段的传输型共振模式形成干扰,最终实现滤光效果.在实验中,通过使用周期固定为1200nm而孔径大小从10到180nm(以10nm递增)的同轴圆环结构,实现了把一束宽带的白光源分成不同颜色的单色光.实验结果表明,该方法解决了天线凹槽和一维层堆光栅型滤光器都普遍存在的偏振敏感性问题,使得类似滤光器件的应用范围更广,更能适应非偏振的自然光.通过有限时域差分法分析得到的理论计算结果和实验结果相匹配,实验现象得到了很好的理论支持和解释.
In recent years, coaxial nanorings have attracted much attention in the field of science due to their special optical properties.In this paper, we will focus on the two types of surfaces existing in the Fabry-Perot cavity based on nanorings Plasma resonance, flat type and transmission type .Through the fixed ring array only changes the ring aperture size method to achieve the transmission resonance and achieve the effect of filtering.At the same time, control the ring array to make it large enough period , So that the planar resonance peak is located in the near infrared band in order to avoid interference with the transmission resonance mode in the visible band and finally achieve the filtering effect.In the experiment, by using a fixed period of 1200nm and a pore size of from 10 to 180nm ( Which is in the order of 10nm), a broadband broadband white light source is divided into different colors of monochromatic light.The experimental results show that this method solves the problem that both the antenna groove and the one-dimensional stacked grating light filter Ubiquitous polarization sensitivity issues make similar filters more versatile and adaptable to unpolarized natural light. Finite-difference time-domain analysis The theoretical calculation results match the experimental results, and the experimental phenomena have been well supported and explained.