Abstract
Chirality in microcavities has recently shown its bright future in optical sensing and microsized coherent light sources. The key parameters for such applications are the high quality (Q) factor and large chirality. However, the previous reported chiral resonances are either low Q modes or require very special cavity designs. Here we demonstrate a novel, robust, and general mechanism to obtain the chirality in circular cavity. By placing a circular cavity and a spiral cavity in proximity, we show that ultra-high Q factor, large chirality, and unidirectional output can be obtained simultaneously. The highest Q factors of the non-orthogonal mode pairs are almost the same as the ones in circular cavity. And the co-propagating directions of the non-orthogonal mode pairs can be reversed by tuning the mode coupling. This new mechanism for the combination of high Q factor and large chirality is found to be very robust to cavity size, refractive index, and the shape deformation, showing very nice fabrication tolerance. And it can be further extended to microcavity chain and microcavity plane. We believe that our research will shed light on the practical applications of chirality and microcavities.
Highlights
Chirality in microcavities has recently shown its bright future in optical sensing and microsized coherent light sources
By placing a circular cavity and a spiral cavity in proximity, we show that ultra-high Q factor, large chirality, and unidirectional output can be obtained simultaneously
We demonstrate a novel, robust, and general mechanism to obtain the chirality in optical microcavities
Summary
Chirality in microcavities has recently shown its bright future in optical sensing and microsized coherent light sources. By placing a circular cavity and a spiral cavity in proximity, we show that ultra-high Q factor, large chirality, and unidirectional output can be obtained simultaneously. The highest Q factors of the non-orthogonal mode pairs are almost the same as the ones in circular cavity. The co-propagating directions of the non-orthogonal mode pairs can be reversed by tuning the mode coupling This new mechanism for the combination of high Q factor and large chirality is found to be very robust to cavity size, refractive index, and the shape deformation, showing very nice fabrication tolerance. There is a lack of a general mechanism to obtain ultra-high Q factor and large chirality from multi-modes simultaneously. By placing a circular cavity and a spiral cavity in proximity, our numerical calculations show that ultra-high Q factor, chirality, and unidirectional output can be obtained simultaneously. We show that the new mechanism can be further extended to microcavity chain and microcavity plane
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