锑烯量子点在全光调制和强光调控中的应用

The applications of antimonene quantum dots in all-optical modulation and control of strong light

为了控制强激光的动态特性,光开关是一个重要的组成部分,特别是电光调制器和全光调制器.本文中首先通过液相剥离法,高效地合成高质量的锑烯量子点.然后利用空间自相位调制技术测量到锑烯量子点的大有效非线性折射系数(~10^(-5)cm^(2) W^(-1)),并阐明其产生的机理.这样的大有效非线性折射率足以改变强激光在等离子体吸收带以外的相位分布,从而导致“开关比”变化.其次,研究锑烯量子点的超快瞬态吸收.最后,基于空间自相位调制在锑烯量子点中成功地实现从紫外到红外的宽带全光调制和弱泵浦光控制的强信号光.研究结果为开发光子器件中等离子体过程的潜力提供一个新的视角.

To control the dynamics of high-intensity laser,optical switch is a crucial component,particularly electro-optic modulator and all-optical modulator.In this paper,we first reported the experimental results of productive,high-quality synthesis of antimonene quantum dots via liquid-phase exfoliation.Secondly,the large effective-nonlinear refractive coefficient(~10^(-5) cm^(2) W^(-1))of antimonene quantum dots was measured via the spatial self-phase modulation technology,and the mechanism was clarified.Such a huge effective-nonlinear refractive index is sufficient for changing phase distribution of intense lasers beyond the plasmon absorption band,leading to“ON/OFF”alteration.Then,the ultrafast transient absorption spectroscopy of antimonene quantum dots was studied.Finally,the broadband all-optical modulation ranging from ultraviolet to infrared and strong signal light controlled by weak pump light were successfully demonstrated based on the spatial self-phase modulation in antimonene quantum dots.Our findings provide a new insight for exploiting the potential of plasmonic processes in photonic devices.