基于VO2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/VO2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/VO2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/VO2双层薄膜纳米点阵间距为9.8 nm、VO2层厚度和Au层厚度均为110 nm、颗粒半径为58 nm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/VO2 double-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/VO2 double-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 9.8 nm pitch,110 nm thickness of Au and VO2,and 58 nm radius at 690 nm. The relative difference of transmittance can reach up to 91%,and relative reflectance difference can arrive at about 90%.