Lee Jeunghoon, Hasan Warefta, Odom Teri W
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113.
J Phys Chem C Nanomater Interfaces. 2009 Feb 12;113(6):2205-2207. doi: 10.1021/jp8111155.
This paper describes three ways to tune the multipolar surface plasmon resonances of Au pyramidal particles: (1) by varying their thickness; (2) by controlling their relative orientation on a surface; and (3) by changing the refractive index of the surrounding media. We found that as the index of the medium was increased that the plasmon resonances red-shifted linearly from visible to near infrared wavelengths. By screening the different geometric parameters, we found that 25-nm thick pyramids in a tip-up orientation produced the largest refractive index sensitivities.
（1）通过改变其厚度；（2）通过控制它们在表面上的相对取向；（3）通过改变周围介质的折射率。我们发现，随着介质折射率的增加，等离子体共振从可见光波长线性红移至近红外波长。通过筛选不同的几何参数，我们发现尖端向上取向的25纳米厚金字塔产生了最大的折射率灵敏度。
