Optical properties of gold pyramidal shells
Optical properties of gold pyramidal shells
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DOI：
10.1021/jp8004844
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发表时间：
2008-05-01
影响因子：
3.7
通讯作者：
Schatz, George C.
中科院分区：
文献类型：
--
作者：
Shuford, Kevin L.;Lee, Jeunghoon;Schatz, George C.
我们提出了一个调查的光学性质的金金字塔壳纳米粒子。理论表明，在近红外波长处的多共振光谱与使用软光刻技术制造的颗粒的测量消光光谱一致。除了电偶极和电四极共振，计算确定了一个不寻常的等离子体激元模式，其中涉及振荡的偏振垂直于入射偏振和波矢量的方向。我们发现，这种TE类共振可以被抑制通过截断的金字塔尖或通过增加壳的厚度，而不会产生不利影响的面内偶极子和四极共振。
We present an investigation of the optical properties of gold pyramidal shell nanoparticles. Theory shows a multiresonance spectrum at near-infrared wavelengths that is consistent with the measured extinction spectra of particles that are fabricated using a soft-lithography technique. In addition to electric dipole and electric quadrupole resonances, the calculations identify an unusual plasmon mode, which involves oscillation of the polarization perpendicular to the direction of both the incident polarization and wave vector. We show that this TE-like resonance can be suppressed by truncating the tip of the pyramid or by increasing the shell thickness without adversely affecting the in-plane dipole and quadrupole resonances.