Investigation of Dual-Color Emissions from Single III-Nitride Nanorod Heterostructures
Cheng-Yen Liu1*, Chun-Yuan Wang1, Chao-Chin Lee1, Shangjr Gwo1,2
1Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
2National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
* presenting author:Cheng-Yen Liu,
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. In this work, we investigate the dual-color emissions from a metal−insulator−semiconductor nanostructure platform, using single dual-core InGaN/GaN nanorods deposited on a Al2O3-capped colloidal Ag crystal with dual In compositions in the nanorod core. Especially, we would like to compare the gain enhancement and mode competition of individual colors under optical pumping. Furthermore, we try to realize the dual-color nanolasers in single plasmonic cavities. In principle, dual-color lasing action can be achieved via a unique auto-tuning mechanism based on the property of weak cavity size dependence inherent in plasmonic nanolasers.

Keywords: Surface plasmon polariton, Dual-color, Semiconductor nanostructure, Plasmonic nanolaser