Enhanced semiconductor optical absorption via surface plasmon excitation in metal nanoparticles
Enhanced semiconductor optical absorption via surface plasmon excitation in metal nanoparticles
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DOI：
10.1063/1.1855423
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发表时间：
2005-02-07
影响因子：
4
通讯作者：
Yu, ET
中科院分区：
文献类型：
--
作者：
Schaadt, DM;Feng, B;Yu, ET
金属纳米颗粒中的表面等离子体共振对于各种应用是令人感兴趣的，这是由于在金属表面附近发生的大的电磁场增强，以及共振波长对纳米颗粒的尺寸、形状和局部介电环境的依赖性。在这里，我们报告了一个工程增强的光吸收和光电流在半导体通过激发表面等离子体共振的球形Au纳米粒子沉积在半导体表面上。半导体内吸收的增强导致Si pn结二极管中在与通过消光光谱的测量确定的纳米颗粒等离子体共振波长紧密对应的波长范围内的光电流响应增加。这些观察结果表明，各种方法来提高设备的性能，如光电探测器，成像阵列，和photopolics。(C)2005年美国物理学会。
Surface plasmon resonances in metallic nanoparticles are of interest for a variety of applications due to the large electromagnetic field enhancement that occurs in the vicinity of the metal surface, and the dependence of the resonance wavelength on the nanoparticle's size, shape, and local dielectric environment. Here we report an engineered enhancement of optical absorption and photocurrent in a semiconductor via the excitation of surface plasmon resonances in spherical Au nanoparticles deposited on the semiconductor surface. The enhancement in absorption within the semiconductor results in increased photocurrent response in Si pn junction diodes over wavelength ranges that correspond closely to the nanoparticle plasmon resonance wavelengths as determined by measurements of extinction spectra. These observations suggest a variety of approaches for improving the performance of devices such as photodetectors, imaging arrays, and photovoltaics. (C) 2005 American Institute of Physics.