Controllable EIT-like mode splitting in a chiral microcavity

摘要

Two coupled resonance modes can lead to exotic transmis-sion spectra due to internal interference processes. Examples include electromagnetically induced transparency (EIT) in atoms and mode splitting in optics. The ability to control individual modes plays a crucial role in controlling such transmission spectra for practical applications. Here we experimentally demonstrate a controllable EIT-like mode splitting in a single microcavity using a double-port excita-tion. The mode splitting caused by internal coupling between two counter-propagating resonances can be effectively con-trolled by varying the power of the two inputs, as well as their relative phase. Moreover, the presence of asymmetric scatte-ring in the microcavity leads to chiral behaviors in the mode splitting in the two propagating directions, manifesting itself in terms of a Fano-like resonance mode. These results may offer a compact platform for a tunable device in all-optical information processing.

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