Controlling the optical bistability and multistability via tunneling-induced and incoherent pumping field in a triple coupled quantum dots at a wavelength of λ = 1.550 μm

Abstract

The behavior of the optical bistability (OB), optical multistability (OM) and transition between them at a wavelength of λ=1.550μm, are investigate in a triple coupled quantum dots nanostructure with two consecutive tunneling-induced and an incoherent pumping field. It is found that OB, OM and transition between them can be accomplished by adjusting different values of intensity tunneling-induced and incoherent pumping field. We observed that with increasing intensity tunneling-induced and incoherent pumping field and probe wavelength detuning λ0 the bistable hysteresis loop becomes narrower which makes the cavity field easier to reach saturation. Switching OB and OM and vice versa is calculated by discussing the dependency of optical properties on the incoherent pumping and inter-dot tunneling rates between QD1, QD2 and QD2, QD3. This system with wavelength 1.550μm, can be useful for provides a new experimental method for the development of new types of nano-optoelectronic devices for the realizing switching process.