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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
