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The ultralong distance coupling between two Asymmetric Resonant Microcavities(ARCs) is studied. Different from traditional short distance tunneling couplingbetween microcavities, the high efficient free space directional emission andexcitation allow ultralong distance energy transfer between ARCs. In thispaper, a novel unidirectional emission ARC, which shows directionality I40 =0.54, is designed for materials of refractive index n = 2.0. Compared withregular whispering gallery microresonators, the coupled unidirectional emissionARCs show modulations of resonance frequency and linewidth even when thedistance between cavities is much longer than wavelength. The performances andproperties of the ultralong distance interaction between ARCs are analyzed andstudied by coupling mode theory in details. The ultralong distance interactionbetween ARCs provides a new way to free-space based optical interconnectsbetween components in integrated photonic circuits.

Ultralong distance coupling between asymmetric resonant microcavities