Ultralong distance coupling between two deformed circular microcavities (DCMs) is studied. Different from traditional short distance tunneling coupling between microcavities, highly efficient free-space directional emission and excitation allow ultralong distance energy transfer between DCMs. In this paper, a novel unidirectional emission DCM, which shows directionality , is designed for materials of refractive index . Compared with circular whispering gallery microcavities, the coupled unidirectional emission DCMs show modulations of resonance frequency even when the distance between cavities is much longer than wavelength. Also, the performance and properties of the ultralong distance interaction between DCMs are analyzed and studied by coupling mode theory in detail. The ultralong distance interaction between DCMs provides a new path to free-space-based optical interconnects between components in integrated photonic circuits.
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