Abstract:
: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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Lee KL,Chang CC,You ML,Pan MY,Wei PKdoi
10.1038/s41598-018-28122-5subject
Has Abstractpub_date
2018-06-27 00:00:00pages
9762issue
1issn
2045-2322pii
10.1038/s41598-018-28122-5journal_volume
8pub_type
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