Zhang Xinping, Liu Hongmei, Tian Jinrong, Song Yanrong, Wang Li
College of Applied Sciences, Beijing University of Technology, Beijing 100022, People's Republic of China.
Nano Lett. 2008 Sep;8(9):2653-8. doi: 10.1021/nl0808435. Epub 2008 Aug 14.
We report a plasmonic diffraction grating device as a new kind of optical polarizer. This simple device consists of periodically distributed gold nanowires on top of a transparent glass substrate and is based on the strong polarization dependence of the particle plasmon resonance of the gold nanowires. A high-efficiency secondary diffraction in the same device enhances the polarization extinction ratio significantly. Linearly polarized spectrum in the red with a bandwidth of 53 nm is selectively picked up from the nonpolarized white light, where a polarization extinction ratio higher than 100 at about 650 nm has been achieved. The idea of plasmonic diffraction grating is important for exploiting new detection and sensor techniques.
我们报道了一种等离子体衍射光栅装置，它是一种新型的光学偏振器。这种简单的装置由周期性分布在透明玻璃基板顶部的金纳米线组成，并且基于金纳米线的粒子等离子体共振的强偏振依赖性。同一装置中的高效二次衍射显著提高了偏振消光比。从非偏振白光中选择性地提取出带宽为53 nm的红色线性偏振光谱，在约650 nm处实现了高于100的偏振消光比。等离子体衍射光栅的概念对于开发新的检测和传感技术很重要。
