The scheme for gain-phase grating is proposed via double tunneling effect in the quantum dot molecules system with five-level structure, which is formed by two quantum dots due to inter-dot tunneling. Combining the stranding-wave control field with the double tunneling effect, the weak probe field could be diffracted to the high-order direction with the strong diffraction intensity. In the presence of double tunneling, the gain accompanied with the certain dispersion occurs, which is responsible for the preparation of the high-efficiency grating. It is found that the first-, second-, and other-order diffraction intensities are simultaneously higher than the central intensity and the diffraction intensities could be controlled by adjusting the parameters such as tunneling intensities, interaction length, probe detuning, relative phase and Rabi frequencies of external fields. The scheme we present can be utilized to develop a new photonic device for optical network and communication.

在具有五能级结构的量子点分子体系中，通过双隧穿效应提出了增益相位光栅的方案，该体系由两个量子点由于点间隧穿而形成。将绞波控制场与双隧穿效应相结合，可以将弱探测场以强衍射强度向高阶方向衍射。在双隧穿的情况下，产生伴随一定色散的增益，这是制备高效光栅的原因。发现一阶、二阶和其他阶衍射强度同时高于中心强度，并且可以通过调整隧穿强度、相互作用长度、探针失谐等参数来控制衍射强度。外场的相对相位和拉比频率。我们提出的方案可用于开发用于光网络和通信的新型光子器件。