Volume 104, Number 4, November 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 December 2013|
Generation and manipulation of higher order Fano resonances in plasmonic nanodisks with a built-in missing sectorial slice
1 School of Physics and Information Technology, Shaanxi Normal University - Xi'an 710062, China
2 School of Material Science and Engineering, Shaanxi Normal University - Xi'an 710062, China
3 Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University - Xi'an 710062, China
Received: 12 August 2013
Accepted: 19 November 2013
Fano resonances have been achieved in a variety of complex plasmonic nanostructures. Here we propose a novel planar structure supporting higher order Fano resonances, a plasmonic nanodisk with a built-in missing sectorial slice whose slice angle varies from 0 to 360°. The numerical results reveal that higher order Fano resonances can be generated in the visible wavelength range when the slice angle locates in a certain range in this reduced-symmetry structure. Such higher order Fano resonances result from the coupling between the dipolar mode supported by the edge of the built-in missing slice and the multipolar ring modes. Furthermore, the effects of dimension and ring width of this structure on the spectral positions and intensities of the higher order Fano resonances are also studied. The line shapes of Fano resonances can be tuned flexibly by modifying the geometrical parameters of this structure.
PACS: 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
© EPLA, 2013
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