皮秒激光下超小型BPQDs非线性光学性质研究

Picosecond laser nonlinear optics properties of ultra small BPQDs

近年来,黑磷量子点(Black Phosphorus Quantum Dots,BPQDs)线性和非线性光学(Nonlinear Optical,NLO)性质的研究取得了一定进展,但BPQDs尺寸依赖的NLO特性的研究仍有待开展。本文研究了5nm以下三种不同尺寸的超小型BPQDs的NLO行为,结果表明,尺寸为23nm的BPQDs比41nm的BPQDs的NLO吸收系数和极化率增加了近一倍,归因于量子限制效应和光致偶极矩的变化,时域有限差分(FDTD)仿真结果证实了这一原因。这项研究证实了调节超小型BPQDs的尺寸是增强其非线性光学效应的一种有效手段,并表明超小型BPQDs在光学和光电器件领域内具有潜在应用价值。

In recent years,some progress has been made in the study of the Nonlinear optics and Nonlinear Optical NLO-NLO properties of Black Phosphorus Quantum Dots(BPQDs),but the size dependNLO NLO properties of BPQDs remain to be studied.In this paper,the NLO behavior of BPQDs with different sizes under 5 nm has been studied.The results show that the NLO absorption coefficient and polarizability of BPQDs with size of 2.3 nm are nearly twice as large as those of BPQDs with size of 4.1 nm,due to the quantum confinement effect and the variation of the photoinduced dipole moment,finite difference time domain method(FDTD)simulations confirm this.This study confirms that nonlinear optics BPQDs is an effective way to enhance their efficiency and shows potential applications in the fields of optics and optoelectronic devices.