Design of Ultra-Small Metallic-Semiconductor Nano-Ring Cavity Lasers

We present design and analysis of metallic-semiconductor nanoring laser lasing at around 1450 nm wavelength, utilizing a body-of-revolution finite-difference-time-domain (BOR-FDTD) simulation incorporated with a semiclassical multilevel model for semiconductor gain medium and the Drude-Lorentz model for metal, which is developed for efficient simulation of disk/ring plasmonic laser. As compared to other literature, our nanoring laser works in radial mode with resonance cycle, m=1, which could facilitate potential in-plane out-coupling, and is wafer bonded onto Si platform for potential electronic-photonic integration. The total footprint, the physical device volume, and the effective mode volume of the nanolaser are only about 0.038 μm², 1.1(λ/2n)³, and 0.001(λ/2n)³, respectively, where n is the average refractive index of the gain medium. To the best of our knowledge, our nanolaser is the smallest reported to date.