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Optical bistability (OB) of plexcitonic Ag–CuCl nanowires (ACNWs) is investigated based on the quasi-static theory. It is found that the strong couplings between the plasmon resonance of inner Ag nanowire and the exciton resonance of outer CuCl shell result in two new plexcitonic modes, which can induce the OBs and hence the two OB regions. Furthermore, the initial wavelengths of the OBs in the ACNW...