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Optical bistability in double quantum dot molecule with inter-dot tunnelling

Yu Chunchao, Sun Lihui, Zhang Huafeng, Chen Fang

Optica Applicata

2019

Vol. 49, nr 2

293--301

We have theoretically studied the optical bistability behaviors under an external electric field and a coupling laser field in double quantum dot molecule system with π-type four energy levels. It can be adjusted by the system parameters such as the electronic cooperation parameter, the tunneling strength, the coupling laser field, the probe and coupling laser detuning. These results may be useful in the experiment and provide new types of all-optical switching.

Double tunneling induced transparency in the asymmetry quantum dot molecules

Yu C., Huang H., Zhang L., Xu D.

Optica Applicata

2016

Vol. 46, nr 3

473--481

Using the density matrix theory, we have studied the double tunneling induced transparency slow light in the double asymmetry quantum dot molecules. With applied electric field, double tunneling induced transparency occur in the same time. Four absorption peaks are found near the resonance energy level in the absorption spectrum and the absorption peak can be tuned by the applied electric field. The velocity and bandwidth of the multiple-windows slow light can also be controlled by the applied electric field. In our model, with Te =0.1meV, we can get about 0.001c and 20GHz bandwidth in each transparency window. Such a property may be applied in all optical buffers, optical switching and filter.