A high-quality factor hybrid plasmonic nanocavity based on distributed Bragg reflectors

Herein, we propose a high-quality (Q) factor hybrid plasmonic nanocavity based on distributed Bragg reflectors (DBRs) with low propagation loss and extremely strong mode confinement. This hybrid plasmonic nanocavity is composed of a high-index cylindrical nanowire separated from a metal surface possessing shallow DBRs gratings by a sufficiently thin low-index dielectric layer. The hybrid plasmonic nanocavity possesses advantages such as a high Purcell factor (F_p) of up to nearly 20000 and a gain threshold approaching 266 cm^-1 at 1550 nm, promising a greater potential in deep sub-wavelength lasing applications.