液晶环境下金纳米柱的表面等离子体特性研究

发布时间：2018-05-29 00:50

本文选题：光学特性 + 表面等离子体　；参考：《光子学报》2017年05期

【摘要】：为了有效研究液晶环境对金属纳米结构表面等离子体的调制作用,基于时域有限差分方法,对液晶环境下金纳米柱结构进行了建模,上下边界采用完全吸收边界条件,四周为周期边界条件.数值模拟了液晶厚度、倾角、光栅距离以及周期结构等参数对金纳米柱的消光特性的调制作用.分析结果表明:随着液晶光轴角度增加,谐振波长出现红移现象,且调制范围为40nm;光栅距离越大,金纳米柱之间的相互作用越弱,谐振波长越小;增加周期长度,谐振波长红移,且随着周期长度增加,次峰作用越明显.利用液晶光学性质可调节金属纳米结构的表面等离子体特性,结果对液晶环境中表面等离子体结构在新的光子器件等方面的研究提供了理论依据.
[Abstract]:In order to effectively study the modulation effect of liquid crystal environment on the surface plasma of metal nanostructures, the gold nanocolumn structure in liquid crystal environment was modeled based on the finite difference time-domain method. The upper and lower boundary conditions were completely absorbed. The circumference is periodic boundary condition. The effects of the parameters such as liquid crystal thickness, inclination angle, grating distance and periodic structure on the extinction characteristics of gold nanocrystals are numerically simulated. The results show that with the increase of the angle of the optical axis of the liquid crystal, the resonant wavelength appears redshift, and the modulation range is 40 nm, the larger the grating distance, the weaker the interaction between the gold nanorods, the smaller the resonant wavelength, and the longer the period. The resonant wavelength is red-shifted, and with the increase of the period length, the effect of the secondary peak is more obvious. The surface plasma characteristics of metal nanostructures can be adjusted by using the optical properties of liquid crystals. The results provide a theoretical basis for the study of surface plasma structures in liquid crystal environments in new photonic devices.
【作者单位】：安徽大学计算智能与信号处理教育部重点实验室;
【基金】：国家自然科学基金(Nos.61101064,51277001,61471001) 教育部新世纪优秀人才基金(No.NCET-12-0596) 安徽省杰出青年基金(No.1108085J01) 安徽省高校优秀青年人才基金重点项目(No.2013SQRL065ZD)资助~~
【分类号】：TB383.1;TN25

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