PubCard - Boron quantum dots all-optical modulator based on efficient photothermal effect

(Peer-Reviewed) Boron quantum dots all-optical modulator based on efficient photothermal effect

Cong Wang 王聪 ¹, Qianyuan Chen 陈潜源 ², Hualong Chen 陈华龙 ¹, Jun Liu 刘军 ¹, Yufeng Song 宋宇锋 ¹, Jie Liu 刘杰 ³, Delong Li 黎德龙 ¹, Yanqi Ge 葛颜绮 ¹, Youning Gong 龚佑宁 ¹, Yupeng Zhang 张豫鹏 ¹, Han Zhang 张晗 ¹

¹ Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
中国深圳深圳大学微纳光电子学研究院二维材料光电科技教育部国际合作联合实验室光电科技协同创新中心
² School of Physics and Technology, and MOE Key Laboratory of Artificial Micro-and Nano-Structures, Wuhan University, Wuhan 430072, China
中国武汉武汉大学物理科学与技术学院人工微结构教育部重点实验室
³ Shandong Provincial Engineering and Technical Center of Light Manipulation & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
中国济南山东师范大学物理与电子科学学院山东省光场调控工程技术中心山东省光学与光子器件技术重点实验室

Opto-Electronic Advances, 2021-07-25

https://doi.org/10.29026/oea.2021.200032

https://www.oejournal.org/article/doi/10.29026/oea.2021.200032

Abstract

All-optical devices without external electronic components have drawn extraordinary attentions in all-optical communication. In this work, boron quantum dots (BQDs) were synthesized by a facile liquid-phase exfoliation method. The as-prepared BQDs showed good structural homogeneity and crystallinity, broadband optical absorption as well as excellent photothermal properties.

Femtosecond-resolved transient absorption further revealed the short carrier relaxation time of BQDs. Inspired by the outstanding photothermal properties and ultrafast carrier dynamic of BQDs, we fabricated BQDs-based all-optical modulator. The phase shift with a slope efficiency of 0.032 π/mW and response time of 0.97 ms can be achieved.

The modulator was used in laser resonance cavity to achieve all-optical actively Q-switched laser operation with control repetition rate. This prototypical BQDs-based all-optical modulator shows a great potential to be applied in all-optical information processing and communication.