Abstract
Surface plasmon polaritons (SPPs) can confine the optical field into a deep subwavelength scale. In the wave propagation phenomena, the group velocity of SPP is greatly slowed down (large group index) due to the dispersion curve of surface plasmon. Moreover, the group index is wavelength dependent and can be related to the greatly enhanced modal gain and confinement factor. Recently, plasmonic nanolasers has been demonstrated that can break the three-dimensional (3D) optical diffraction limit. In this work, we have successfully realized the dual-color plasmonic nanolasers on a metal−insulator−semiconductor nanostructure platform, using single dual-core InGaN/GaN nanorods deposited on single crystalline epitaxial Al film with dual In compositions in the nanorod core. Different from conventional laser, plasmonic nanolaser can lase two coherent light in single cavities. Especially, dual-color lasing action is achieved via a unique “autotuning” mechanism based on the property of weak cavity size dependence inherent in plasmonic nanolasers