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In a non-Hermitian optical system with loss and gain, an exceptional point(EP) will arise under specific parameters where the eigenvalues and eigenstatesexhibit simultaneous coalescence. Here we report a dynamical switching oflasing behavior in a non-Hermitian system composed of coupled microcavities bymodulating the EPs. Utilizing the effect of gain, loss and coupling on theeigenstates of coupled microcavities, the evolution path of the eigenvaluesrelated to the laser emission characteristics can be modulated. As a result,the lasing emission property of the coupled cavities exhibits an dynamicalswitching behavior, which can also be effectively controlled by tuning the gainand loss of the cavities. Moreover, the evolution behavior in a morecomplicated system composed of three coupled microcavities is investigated,which shows a better tunability compared with the two-microcavity system. Ourresults have correlated the EPs in non-Hermitian system with lasing emission incomplex microcavity systems, which shows great potential for realizingdynamical, ultrafast and multifunctional optoelectronic devices for on-chipintegrations.

Dynamical switching of lasing emission by exceptional point modulation in coupled microcavities