Recent results on radiation damping suppression in individual plasmonic resonators using conformal bending of the structure, which suppresses the electric-dipole response in favor of magnetic dipole one, are overviewed. It is demon- strated that bending of linear plasmonic nano-antennas increases significantly their Q factors above the electro- static limit while preserving the nature of resonance along with its exceptional features, such as linear size-dependent tunability and robust field enhancement. The approach, which makes use of strong lateral confinement exhibited by the slow plasmonic modes (slow-SPPs) bound to ultra- narrow metallic structures, turned out to be quite general, and its experimental demonstration has been attained with circularly curved nano-rod antennas. Furthermore, this approach suggested novel configurations of plasmonic single particle nanosensing with enhanced features, allow- ing record-high figures of merit along with unprecedented spatial resolution in nanofiber-based split-cylinder structures.

Efficient suppression of radiation damping in individual plasmonic resonators: towards high-Q nano-volume sensing

DELLA VALLE, GIUSEPPE;
2012-01-01

Abstract

Recent results on radiation damping suppression in individual plasmonic resonators using conformal bending of the structure, which suppresses the electric-dipole response in favor of magnetic dipole one, are overviewed. It is demon- strated that bending of linear plasmonic nano-antennas increases significantly their Q factors above the electro- static limit while preserving the nature of resonance along with its exceptional features, such as linear size-dependent tunability and robust field enhancement. The approach, which makes use of strong lateral confinement exhibited by the slow plasmonic modes (slow-SPPs) bound to ultra- narrow metallic structures, turned out to be quite general, and its experimental demonstration has been attained with circularly curved nano-rod antennas. Furthermore, this approach suggested novel configurations of plasmonic single particle nanosensing with enhanced features, allow- ing record-high figures of merit along with unprecedented spatial resolution in nanofiber-based split-cylinder structures.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/662368
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