High-efficiency asymmetric diffraction based on PT-antisymmetry in quantum dot molecules

doi:10.1088/1674-1056/ac0422

中国物理B ›› 2022, Vol. 31 ›› Issue (1): 14202-014202.doi: 10.1088/1674-1056/ac0422

High-efficiency asymmetric diffraction based on PT-antisymmetry in quantum dot molecules

Guangling Cheng(程广玲)¹, Yongsheng Hu(胡永升)¹, Wenxue Zhong(钟文学)¹, and Aixi Chen(陈爱喜)^2,†

1 Department of Applied Physics, East China Jiaotong University, Nanchang 330013, China;
2 Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, China

收稿日期:2021-04-28 修回日期:2021-05-18 接受日期:2021-05-24 出版日期:2021-12-03 发布日期:2021-12-14
通讯作者: Aixi Chen E-mail:aixichen@zstu.edu.cn
基金资助:
This work is supported by the National Natural Science Foundation of China (Grant Nos. 11905064, 11775190 and 11565013) and the Scientific Research Foundation of Jiangxi Provincial Education Department, China (Grant No. GJJ200624).

High-efficiency asymmetric diffraction based on PT-antisymmetry in quantum dot molecules

Guangling Cheng(程广玲)¹, Yongsheng Hu(胡永升)¹, Wenxue Zhong(钟文学)¹, and Aixi Chen(陈爱喜)^2,†

1 Department of Applied Physics, East China Jiaotong University, Nanchang 330013, China;
2 Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, China

Received:2021-04-28 Revised:2021-05-18 Accepted:2021-05-24 Online:2021-12-03 Published:2021-12-14
Contact: Aixi Chen E-mail:aixichen@zstu.edu.cn
Supported by:
This work is supported by the National Natural Science Foundation of China (Grant Nos. 11905064, 11775190 and 11565013) and the Scientific Research Foundation of Jiangxi Provincial Education Department, China (Grant No. GJJ200624).

摘要/Abstract

摘要： We present preparation of asymmetric grating with higher diffraction efficiency in quantum dot molecules by combining the tunneling effect and parity-time antisymmetry. In the presence of tunneling between two quantum dots, the system exhibits the striking PT antisymmetry via spatially modulating the driving field and the detuning with respect to the driven transition. For this reason, the asymmetric grating could be achieved. The results show that the diffraction efficiency can be adjustable via changing the driving intensity, detuning, tunneling strength, and interaction length, and then the high-order diffraction can be reached. The scheme provides a feasible way to obtain the direction-controlled diffraction grating, which can be helpful for optical information processing and realization of controllable optical self-image.

关键词: asymmetric diffraction grating, PT antisymmetry, tunneling effect

Abstract: We present preparation of asymmetric grating with higher diffraction efficiency in quantum dot molecules by combining the tunneling effect and parity-time antisymmetry. In the presence of tunneling between two quantum dots, the system exhibits the striking PT antisymmetry via spatially modulating the driving field and the detuning with respect to the driven transition. For this reason, the asymmetric grating could be achieved. The results show that the diffraction efficiency can be adjustable via changing the driving intensity, detuning, tunneling strength, and interaction length, and then the high-order diffraction can be reached. The scheme provides a feasible way to obtain the direction-controlled diffraction grating, which can be helpful for optical information processing and realization of controllable optical self-image.

Key words: asymmetric diffraction grating, PT antisymmetry, tunneling effect

中图分类号: (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

42.50.Gy

32.80.Qk (Coherent control of atomic interactions with photons)

Guangling Cheng(程广玲), Yongsheng Hu(胡永升), Wenxue Zhong(钟文学), and Aixi Chen(陈爱喜). High-efficiency asymmetric diffraction based on PT-antisymmetry in quantum dot molecules[J]. 中国物理B, 2022, 31(1): 14202-014202.

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High-efficiency asymmetric diffraction based on PT-antisymmetry in quantum dot molecules

High-efficiency asymmetric diffraction based on PT-antisymmetry in quantum dot molecules

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