META 2021, META'12

Font Size: 
Purcell factor of plasmonic nanoantennas
Christophe Sauvan, Jean-Paul Hugonin, Philippe Lalanne

Last modified: 2012-01-03


Purcell factor is a widely used figure of merit for spontaneous emission modification in optical microcavities. It has been recently shown that the standard definition of Purcell factor does not apply to describe spontaneous emission in dissipative systems such as plasmonic antennas that consist of metallic nanostructures [A.F. Koenderink, Opt. Lett. 35, 4208 (2010)]. We show that the definition of Purcell factor can be generalized to dissipative systems by correctly handling the losses (due to absorption and/or radiation) in the electromagnetic treatment of spontaneous emission. We apply our generalized formalism to single and coupled antennas and show that spontaneous emission near dissipative nanostructures is accurately described by a complex Purcell factor, whose imaginary part reflects the presence of dissipation in the system.


plasmonics; nanoantennas