Metal鈥揇ielectric Waveguides for High-Efficiency Coupled Emission

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• 作者：Ramachandram Badugu ; Henryk Szmacinski ; Krishanu Ray ; Emiliano Descrovi ; Serena Ricciardi ; Douguo Zhang ; Junxue Chen ; Yiping Huo ; Joseph R. Lakowicz
• 刊名：ACS Photonics
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：2
• 期：7
• 页码：810-815
• 全文大小：474K
• ISSN：2330-4022

文摘

We report a metal鈥揹ielectric planar structure that provides high-efficiency coupling of fluorescence at distances over 100 nm away from the metal surface. This hybrid metal鈥揹ielectric waveguide (MDW) consists of a continuous metal film coated with a dielectric layer. We observed efficient long-range coupling of rhodamine B on top of a 130 nm layer of silica, resulting in a narrow angular distribution of the emission. The high-efficiency radiation through the Ag film appears to be due to coupling of the fluorophore to an optical waveguide mode with a long propagation length and a narrow resonance. The results were consistent with simulations. These multilayer structures can be made using vapor deposition and/or spin coating, and the silica surface can be used for conjugation to biomolecules and surface-selective detection. This simple hybrid metal鈥揹ielectric structure provides new opportunities for fluorescence sensing, genomics, proteomics, and diagnostics.