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Abstract
The compact cavity is always conducive to the integration and application of the devices based on whispering gallery modes. However, it is a challenge to strike a balance between the pursuit of a smaller cavity and higher quality. Here, we propose a low-loss cavity by combining a microsphere with a metal substrate, thereby compressing the cavity size by 24%. In addition, the substrate-modulated cavity is found to have a higher confinement factor and Purcell factor, showing the good prospect for realizing high-performance compact lasers.
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