Metallic Nanowire Array–Polymer Hybrid Film for Surface Plasmon Resonance Sensitivity Enhancement and Spectral Range Enlargement
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In this paper, the coupling interaction is investigated between a metallic nanowire array and a metal film under the Kretschmann condition. The plasmonic multilayer is composed of a metallic nanowire array embedded in a polymer layer positioned above a metal film, exploiting the classical surface plasmon resonance (SPR) configuration. We analyze the influence of various structural parameters of the metallic nanowire array on the SPR spectrum of thin metal film. The results show that the coupling interactions of nanowires with the metal film can greatly affect SPR resonance wavelength and increase SPR sensitivity. The coupling strength of metallic nanowire array and metal film also impacts resonance wavelength, which can be used to adjust SPR range but have little effect on its sensitivity. The results are confirmed using a dipole coupling resonance model of metallic nanowire. We demonstrated that this nanostructured hybrid structure can be used for high sensitivity SPR monitoring in a large spectral range, which is important for advanced SPR measurement including fiber-optic SPR sensing technology.
KeywordsNanostructures Metal optics Multilayer design Biological sensing and sensors
The authors would like to thank financial supports from the National Nature Science Foundation of China (grant nos. 61137005 and 60977055), the Ministry of Education of China (grant nos. NCET-09-0255, DUT11Z102, and SRFDP 20120041110040), and the National Science and Engineering Research Council of Canada (NSERC – Discovery Grant).
- 1.Maier SA (2007) Plasmonics: Fundamentals and ApplicationsGoogle Scholar
- 22.Born M, Wolf E (1986) Principles of optics: electromagnetic theory of propagation, interference and diffraction of light. Pergamon, LondonGoogle Scholar