Department of Physics , Zhejiang Normal University , Jinhua 321004 , Zhejiang , P. R. China.
State Key Laboratory of Luminescent Materials and Devices and School of Materials Science and Engineering , South China University of Technology , Wushan Road 381 , Guangzhou 510641 , P. R. China.
ACS Appl Mater Interfaces. 2019 Oct 30;11(43):40416-40423. doi: 10.1021/acsami.9b10949. Epub 2019 Oct 17.
Heavily self-doped semiconductors can be designed to be used in advanced photonics due to both fabrication and functional advantages. Ultrafast response, strong optical nonlinearity, broadband wavelength range, and accessibility of integration are major challenges for ultrafast all-optical photonics to operate in the infrared wavelength range. Here, solution-processed CuSe semiconductor nanocrystals (NCs) demonstrate an ultrafast response (about 360-520 fs), strong optical nonlinearity (as large as -1.4 × 10 cm GW), and broadband (from 800 to 3000 nm) nonlinear optical absorption in the near-infrared and mid-infrared wavelength ranges. The ultrafast response and larger optical nonlinearity may be triggered by the plasma ground-state bleaching in the strong surface electromagnetic filed. Stable Q-switched lasers in Er-doped fiber laser, Tm-doped fiber laser, and Ho/Pr-codoped ZBLAN fiber laser are operated, respectively. These findings indicate that CuSe NCs are prospective nonlinear materials for ultrafast response and broadband pulse laser.
由于制备和功能上的优势，重度自掺杂半导体可被设计用于先进的光子学。超快响应、强光学非线性、宽波长范围以及易于集成是红外波长范围内超快全光光子学运行的主要挑战。在这里，溶液处理的 CuSe 半导体纳米晶体 (NCs) 在近红外和中红外波长范围内表现出超快响应（约 360-520 fs）、强光学非线性（高达-1.4×10 cm GW）和宽带（800 至 3000nm）非线性光学吸收。超快响应和更大的光学非线性可能是由强表面电磁场中的等离子体基态漂白引发的。在掺铒光纤激光器、掺铥光纤激光器和 Ho/Pr 共掺 ZBLAN 光纤激光器中分别实现了稳定的 Q 开关激光器。这些发现表明，CuSe NCs 是用于超快响应和宽带脉冲激光的有前途的非线性材料。
