【摘要】 通过高分辨率电子束光刻方法制备了不同形状的三层复合材料纳米颗粒,研究了这种纳米颗粒的形状变化对消光特性的影响。测试结果表明,当入射波偏振方向平行于短轴时,随着长宽比的增大,共振峰位置发生"蓝移";当光源偏振方向平行于长轴时,随着长宽比的增大,共振峰位置发生"红移"。还用时域有限差分算法以及表面等离波子的Lorentz模型对纳米颗粒的消光特性进行数值计算,所得的消光频谱曲线、共振峰位置变化趋势与实验基本一致。此外,还研究了主体材料层厚度对消光特性的影响,发现其厚度在20～90nm变化时,共振峰发生3～115nm的"蓝移"。更多还原

【Abstract】 Various shapes of three-layers composite material nanoparticles is manufactured by using high-resolution electron beam lithography method and the influence of shape on extinction properties for the nanoparticles is studied.The results show that if the direction of light source polarization is parallel to the short axis,the resonance peak gets a blue shift with the increasing aspect ratio;if the direction of light source polarization is parallel to the long axis,the resonance peak gets a red shift with the increasing aspect ratio.The extinction properties of nanoparticles is also calculated by using finite-difference time-domain algorithm and Lorentz model of surface plasmon,the curve of extinction spectra and the position of resonance peaks are basically consistent with the experimental results.Besides,the influence of thickness on extinction properties for the body material is studied,and it is found that if the thickness changed from 20 to 90 nm,the resonance peak gets a blue shift of 3~115 nm.更多还原