Ultrahigh Purcell factor in low-threshold nanolaser based on asymmetric hybrid plasmonic cavity.
A low-threshold nanolaser with all three dimensions at the subwavelength scale is proposed and investigated. The nanolaser is constructed based on an asymmetric hybrid plasmonic F-P cavity with Ag-coated end facets. Lasing characteristics are calculated using finite element method at the wavelength of 1550 nm. The results show that owing to the low modal loss, large modal confinement factor of the asymmetric plasmonic cavity structure, in conjunction with the high reflectivity of the Ag reflectors, a minimum threshold gain of 240 cm(-1) is predicted. Furthermore, the Purcell factor as large as 2518 is obtained with optimized structure parameters to enhance rates of spontaneous and stimulated emission.
Department of Physics, University College Cork, Western Road, Cork, Ireland.|Tyndall National Institute, Lee Maltings, Cork, Ireland.
Wei
W
Wei
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, P. O. Box 66, Beijing 100876, China.
Xin
X
Yan
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, P. O. Box 66, Beijing 100876, China.
Xia
X
Zhang