Multiple Fano resonances in single-layer nonconcentric core-shell nanostructures.
- 29 March 2013
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 21 (7), 8426-8436
- https://doi.org/10.1364/oe.21.008426
Abstract
Multiple plasmonic Fano resonances are generally considered to require complex nanostructures, such as multilayer structure, to provide several dark modes that can couple with the bright mode. In this paper, we show the existence of multiple Fano resonances in single layer core-shell nanostructures where the multiple dark modes appear due to the geometrical symmetry breaking induced by axial offset of the core. Both dielectric-core-metal-shell (DCMS) and metal-core-dielectric-shell (MCDS) configurations have been studied. Compared to the MCDS structure, the DCMS configuration provides higher modulation depth. Analytical studies based on transformation optics and numerical simulations have been performed to investigate the role of geometrical and material parameters on the optical properties of the proposed nanostructures. Refractive index sensing with higher-order Fano resonances has also been described, providing opportunity for multiwavelength sensing with high figure of merit.This publication has 48 references indexed in Scilit:
- Transformation Optics and Subwavelength Control of LightScience, 2012
- Broadband Light Harvesting Nanostructures Robust to Edge BluntnessPhysical Review Letters, 2012
- Laser Fabrication of Large-Scale Nanoparticle Arrays for Sensing ApplicationsACS Nano, 2011
- Collection and Concentration of Light by Touching Spheres: A Transformation Optics ApproachPhysical Review Letters, 2010
- Surface Plasmons and SingularitiesNano Letters, 2010
- Plasmonic Light-Harvesting Devices over the Whole Visible SpectrumNano Letters, 2010
- Demonstration of a spaser-based nanolaserNature, 2009
- Symmetry Breaking in Plasmonic Nanocavities: Subradiant LSPR Sensing and a Tunable Fano ResonanceNano Letters, 2008
- Semiconductor-Metal Nanoparticle Molecules: Hybrid Excitons and the Nonlinear Fano EffectPhysical Review Letters, 2006
- Near-field photonics: surface plasmon polaritons and localized surface plasmonsJournal of Optics A: Pure and Applied Optics, 2003