Collimated directional emission from a peanut-shaped microresonator
Fang-Jie Shu, Chang-Ling Zou, Fang-Wen Sun, and Yun-Feng Xiao
TL;DR
This paper introduces a peanut-shaped microresonator capable of highly directional, collimated emission with divergence as small as 2.5 degrees, promising for on-chip laser applications.
Contribution
It presents a novel peanut-shaped microcavity design supporting highly directional emission, with detailed ray and wave analysis confirming the narrow divergence.
Findings
Emission divergence as small as 2.5 degrees
Wave simulations confirm the directional emission
Potential for highly collimated on-chip lasers
Abstract
Collimated directional emission is essentially required an asymmetric resonant cavity. In this paper, we theoretically investigate a type of peanut-shaped microcavity which can support highly directional emission with the emission divergence as small as 2.5o. The mechanism of the collimated emission is explained with the short-term ray trajectory and the intuitive lens model in detail. Wave simulation also confirms these results. This extremely narrow divergence of the emission holds a great potential in highly collimated lasing from on-chip microcavities.
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