Figure |Schematic description of loss induced nonreciprocity. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure |Schematic description of loss induced nonreciprocity.

Caption

a, sketch of a system with an array of main resonance modes a_m connected via a series of connecting modes c_m^((n)), with the decay rate κ_m^((n)); b, sketch of a multichannel coupled system with synthetic frequency dimensions; c, illustration of multichannel interference for realizing nonreciprocity. For the first (second) coupling channel, the coherent coupling phase is ?_m^((1)) (?_m^((2))) for the forward coupling and -?_m^((1)) (-?_m^((2))) for the backward coupling, while the loss phases are θ_m^((1)) (θ_m^((2))) for both the forward and backward couplings. By tuning the phases, constructive (destructive) interference can be achieved for the forward (backward) coupling, giving rise to nonreciprocity and unidirectional energy transmission.

Credit

by Xinyao Huang, Cuicui Lu, Chao Liang, Honggeng Tao, and Yong-Chun Liu

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