Abstract
A dual-disk ring (DDR) structure with broken symmetry and weakly dissipating material, silver, is proposed to achieve Fano resonance in visible wavelength range. Symmetry breaking of a metallic ring is realized by placing two disks inside the ring. The excitation of the Fano resonance is interpreted in terms of coupling of the ring and the dual-disk plasmonic modes. The potential of using an array of such DDR nano structures as a biochemical sensor is evaluated with the figure of merit (FOM). Based on our design and simulation, arrays with DDR structures are fabricated and the Fano resonance peak is observed in visible wavelength range of extinction spectra of individual silver DDR nanostructures.
Highlights
Fano resonance in nanoscale plasmonic nanostructures could have many promising applications in both biological and physical sciences [1,2]
The excitation of the Fano resonance is interpreted in terms of coupling
The potential of using an array of such dual-disk ring (DDR) nano structures as a biochemical sensor is evaluated with the figure of merit
Summary
Fano resonance in nanoscale plasmonic nanostructures could have many promising applications in both biological and physical sciences [1,2]. Majority of previously suggested structures have pronounced Fano resonance peaks in the near IR range of spectra, while for. Received 12 Sep 2011; revised 7 Oct 2011; accepted 11 Oct 2011; published 28 Oct 2011 7 November 2011 / Vol 19, No 23 / OPTICS EXPRESS 22974 many practical applications it is preferred or necessary to achieve a sensitive spectral response located in visible range. This paper elaborates on our newly proposed design, fabrication and characterization work of a dual-disk ring (DDR) silver nanostructure to achieve a Fano resonance with its spectral response feature located in visible range. Optical responses of the proposed nano structures to a change of both bulk and interfacial refractive index were calculated and analyzed
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