Au/VO_2双层薄膜纳米点阵的光学特性  

Optical Properties of Au/VO_2 Double-film Nano Array

作　　者：孙瑶[1] 李毅[1,2] 唐佳茵[1] 刘飞[1] 郝如龙 方宝英[1] 王晓华[1,3] 肖寒[1] 陈培祖 伍征义 徐婷婷[1] 蒋蔚[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]上海市现代光学系统重点实验室,上海200093 [3]上海电力学院电子与信息工程学院,上海200090

出　　处：《光子学报》2015年第11期55-61,共7页Acta Photonica Sinica

基　　金：国家高技术研究发展计划(No.2006AA03Z348);教育部科学技术研究重点项目(No.207033);上海市科学技术委员会科技攻关计划(No.06DZ11415);上海市教育委员会科研创新重点项目(No.10ZZ94);上海市领军人才培养计划资助~~

摘　　要：基于VO_2薄膜的热致相变特性,利用修正的Sellmeier色散模型和有限时域差分法计算了Au/VO_2双层薄膜纳米点阵的透过率和反射率,发现其存在反转效应,且反转效应受点阵间距、膜层厚度和颗粒半径等参量调控.随着颗粒间距的增大,透射谱中谐振峰的位置发生红移,透过率反转差值增加,但间距进一步增大时,反转效应消失.随着Au/VO_2膜层厚度的减小,透过率明显增大,透过率反转差值也随之改变.随着颗粒尺寸的增大,相变前后的透过率差值逐渐增大,但当颗粒尺寸进一步增大时,透过率反转效应不明显.对点阵间距、膜层厚度和颗粒半径的优化结果表明,Au/VO_2双层薄膜纳米点阵间距为9.8nm、VO_2层厚度和Au层厚度均为110nm、颗粒半径为58nm时,反转效应最明显,其相对透过率反转差值可达91%,其相对反射率反转差值可达90%.Based on the pronounced thermochromism of VO2,the transmittance and the reflectance of Au/VO2double-film nano array were calculated with a modificatory Sellmeier dispersion model and finite difference time domain method.The simulated results show that there is a reversal effect,and the reversal effect is depended on the pitch between particles,the thickness of film and the radius of particle.When the pitch becomes large,the peak position of transmittance appears red-shift,and the transmittance reversal difference of Au/VO2double-film nano array obviously increases.The reversal effect will disappear with the pitch further increasing.When the thickness of Au/VO2 decreases,the transmittance will increase,and the reversal difference will change.The difference of transmittance is bigger with the radius of particle increasing.However,the reversal effect is not obvious while the size of nano particle is futher increasing.By optimizing the pitch,the thickness and the radius of the particle,there is the best reversal effect with 9.8nm pitch,110 nm thickness of Au and VO2,and 58 nm radius at690 nm.The relative difference of transmittance can reach up to 91%,and relative reflectance difference can arrive at about 90%.

关 键 词：薄膜 纳米点阵 有限时域差分 Au/VO2 反转效应 热致相变 优化 

分 类 号：TB33[一般工业技术—材料科学与工程] TB34