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Opt Lett. 2011 Nov 15;36(22):4386-8. doi: 10.1364/OL.36.004386.

Shape of Fano resonance line spectra calculated for silver nanorods.

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  • 1Department of Chemistry, University of Central Florida, Orlando, Florida 32816, USA.


Using theoretical tools, we numerically demonstrated Fano line shapes in the scattering spectra of silver rods resulting from different mechanisms. One of the Fano line shapes is due to the coupling of an in-plane quadrupole and a dipole mode in a single rod. Two nodes were observed at the resonance wavelength, each of which is located at a quarter of the rod length from the two ends. The Fano resonance is strengthened when the silver rod is cut at the two nodal positions. The second mechanism that gives rise to a new Fano resonance peak occurs when the symmetry of the rod is broken and is a result of the asymmetric coupling between the two excited dipoles.

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