期刊
OPTICS COMMUNICATIONS
卷 309, 期 -, 页码 148-152出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2013.05.058
关键词
Ultralong surface plasmon propagation; Au thin film; Surface plasmon resonance; Sensitive nitrogen dioxide detection
类别
资金
- Swiss National Science Foundation [200021-137711]
- Swiss National Science Foundation (SNF) [200021_137711] Funding Source: Swiss National Science Foundation (SNF)
We demonstrate effective surface plasmon propagation along thin gold film in a blue spectral range: the measured 0.6 degrees angular width of the plasmon excitation peak corresponds to the propagation length around 7 mu m. For this end, we prepared a specially designed photonic crystal (PC; 18-layer 1D structure of altering transparent dielectric layers with relatively large and low refraction indices deposited onto a silica support) coated by a 8 nm thick gold layer. For given blue light wavelength (405 nm) and certain light incidence angle this 1D PC structure supports ultralong surface plasmon propagation along the gold nanofilm. This structure has been tested as a surface plasmon resonance sensor to detect small concentrations of nitrogen dioxide in air. This sensor exhibited the sensitivity similar to earlier works where surface plasmon resonance in red spectral range has been used for this purpose. (C) 2013 Elsevier B.V. All rights reserved.
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