Abstract
Whispering gallery mode (WGM) lasers and resonators are key building blocks for photonic integrated circuits. The quality factor and resonant wavelength are strong functions of the cavity size. Nanoscale WGM cavities suffer from a low-quality factor due to prominent scattering loss. However, the quality factor could be enhanced by forming an optically-coupled rod array or photonic molecules. Through simulations, we revealed how rod-to-rod optical coupling influenced the threshold pumping level and dominant mode selection, where the trend showed good agreement with the experimental observation. According to the simulation, the quality factor could be enhanced by up to eight times by forming a six-rod photonic molecule. The quality factor and effective mode were both superior to the single rods with the same wafer device footprint.
Highlights
Low-loss microcavity lasers have attracted a great amount of research interest for studying fundamental light–matter interactions and their potential applications for on-chip light manipulation [1,2]
At selection the end of paper, we suggest a highly enhancement and its relevance to the dominant mode in this the monolithic rod symmetric photonic molecule consisting of six hexagon nanorods, which would balance a small array
At the end of this paper, we suggest a highly symmetric photonic molecule consisting of six mode-volume, a high-quality and a low device footprint on the wafer to the hexagon nanorods, which wouldfactor, balance a small mode-volume, a high-quality factor,according and a low device simulation footprint onresults
Summary
Low-loss microcavity lasers have attracted a great amount of research interest for studying fundamental light–matter interactions and their potential applications for on-chip light manipulation [1,2]. Among the different categories of microcavity lasers, whispering gallery mode (WGM) lasers possess high feasibility for use in monolithic fabrication, which is essential for large-area and high-order device integration. A large cavity is accompanied by narrower mode spacing, lower speed, and a larger footprint on the chip, which might not be desirable for wavelength-selective applications. The resonant wavelengths shift with the cavity dimensions, bringing additional constraints in spectral engineering. The coupling between identical microcavities results in new supermodes with slightly shifted resonant wavelengths. These optically-coupled microcavities are known as “photonic molecules”
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