Subwavelength hybrid plasmonic nanodisk with highQ factor and Purcell factor

Abstract

Optical nanodisk resonators based on a hybrid plasmonic waveguiding geometry areinvestigated theoretically in the wavelength range of 1200–2000 nm with their radiivarying from 320 to 1000 nm. Due to the fact that a hybrid plasmonic structure canefficiently confine light in a deep-subwavelength mode volume with a relativelylow propagation loss, the nanodisks designed exhibit simultaneously a highQ factor and a high Purcell factor. For a hybrid plasmonic nanodisk with the radius of 1000 nm, aQ factor of 819 and a Purcell factor of 1827 are achieved at the telecommunicationwavelength of 1558 nm.