Enhancing Surface Sensing Sensitivity of Metallic Nanostructures using Blue-Shifted Surface Plasmon Mode and Fano Resonance
| Autor: | Ming-Yang Pan, Meng-Lin You, Chia-Chun Chang, Pei-Kuen Wei, Kuang-Li Lee |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Multidisciplinary
Materials science Nanostructure business.industry lcsh:R Surface plasmon lcsh:Medicine Resonance Fano resonance Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Article Blueshift 010309 optics Wavelength 0103 physical sciences Optoelectronics lcsh:Q lcsh:Science 0210 nano-technology business Refractive index Plasmon |
| Zdroj: | Scientific Reports Scientific Reports, Vol 8, Iss 1, Pp 1-12 (2018) |
| ISSN: | 2045-2322 |
| Popis: | Improving surface sensitivities of nanostructure-based plasmonic sensors is an important issue to be addressed. Among the SPR measurements, the wavelength interrogation is commonly utilized. We proposed using blue-shifted surface plasmon mode and Fano resonance, caused by the coupling of a cavity mode (angle-independent) and the surface plasmon mode (angle-dependent) in a long-periodicity silver nanoslit array, to increase surface (wavelength) sensitivities of metallic nanostructures. It results in an improvement by at least a factor of 4 in the spectral shift as compared to sensors operated under normal incidence. The improved surface sensitivity was attributed to a high refractive index sensitivity and the decrease of plasmonic evanescent field caused by two effects, the Fano coupling and the blue-shifted resonance. These concepts can enhance the sensing capability and be applicable to various metallic nanostructures with periodicities. |
| Databáze: | OpenAIRE |
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