Band-Selective Optical Polarizer Based on Gold-Nanowire Plasmonic Diffraction Gratings

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• 作者：Xinping Zhang ; Hongmei Liu ; Jinrong Tian ; Yanrong Song ; Li Wang
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：September 10, 2008
• 年：2008
• 卷：8
• 期：9
• 页码：2653-2658
• 全文大小：366K
• 年卷期：v.8,no.9(September 10, 2008)
• ISSN：1530-6992

文摘

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.