Abstract
A hybrid plasmonic nanolaser based on nanowire/air slot/semicircular graphene and metal wire structure was designed. In this structure, the waveguides in the nanowires and the graphene-metal interface are coupled to form a hybrid plasma mode, which effectively reduces the metal loss. The mode and strong coupling of the laser are analyzed by using the finite-element method. Its electric field distribution, propagation loss, normalized mode area, quality factor, and lasing threshold are studied with the different geometric model. Simulation results reveal that the performance of the laser using this structure can be optimized by adjusting the model parameters. Under the optimal parameters, the effective propagation loss is only 0.0096, and the lasing threshold can be as low as 0.14 μm−1. This structure can achieve deep sub-wavelength confinement and low-loss transmission, and provides technical support for the miniaturization and integration of nano-devices.
Highlights
Since the advent of the first laser in the 1960s, lasers, like other major human inventions, have had a huge impact on human production and life
The finite element method is used to analyze the variation of the mode characteristics, quality factor, and threshold of the laser with the geometric model, and the model of the nanolaser is optimized to make the overall performance better
Focused ionfocused beam technology (FIB), an air gap an with width g and a w g and a thickness of ht on the surface of the SiO2 layer was etched, and ht is the distance from the thickness of ht on the surface of the SiO2 layer was etched, and ht is the distance from the bottom end of bottom end ofnanowire the dielectric the top of the graphene
Summary
Since the advent of the first laser in the 1960s, lasers, like other major human inventions, have had a huge impact on human production and life. Subject to the diffraction limit, in the traditional semiconductor laser structure, its spatial size and mode size are larger than half a wavelength, and the miniaturization of the laser is hindered, which seriously restricts its integration with nano-optical devices [3,4,5,6,7,8,9]. SPs have broad application prospects in many fields, there are still many problems to be solved in practical applications These SPs waveguides have large loss during transmission because their structure contains a metal material having a negative dielectric constant, resulting in a relatively short transmission distance of light. The finite element method is used to analyze the variation of the mode characteristics, quality factor, and threshold of the laser with the geometric model, and the model of the nanolaser is optimized to make the overall performance better
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