Subwavelength hybrid plasmonic nanodisk with highQfactor and Purcell factor

Optical nanodisk resonators based on a hybrid plasmonic waveguiding geometry are investigated theoretically in the wavelength range of 1200–2000 nm with their radii varying from 320 to 1000 nm. Due to the fact that a hybrid plasmonic structure can efficiently confine light in a deep-subwavelength mode volume with a relatively low propagation loss, the nanodisks designed exhibit simultaneously a high Q factor and a high Purcell factor. For a hybrid plasmonic nanodisk with the radius of 1000 nm, a Q factor of 819 and a Purcell factor of 1827 are achieved at the telecommunication wavelength of 1558 nm.