Mehdinejad Ali
Department of Physics, Sharif University of Science and Technology, Tehran, Iran.
Sci Rep. 2024 Sep 18;14(1):21836. doi: 10.1038/s41598-024-72776-3.
We explore the dynamics of nonlinear parametric generation and light beam propagation in a Landau-quantized graphene structure with three energy levels interacting with two laser pulses, utilizing the Maxwell-Bloch equations. By applying a laser field to one transition of the graphene sample while keeping the second beam initially absent, the distinctive preparation of the graphene sample, coupled with its weak interaction with laser radiation, results in the parametric generation of a new laser beam in a different transition. We investigate the influence of diverse system parameters on both the efficiency of the generated beam and the propagation dynamics of both beams. Our findings reveal that manipulating these parameters can induce oscillations in the intensity of propagated beams, mitigate absorption losses during propagation allowing for earlier relaxation, and enhance the efficiency of energy transfer from the initial to the generated beam. Additionally, we demonstrate the transfer of optical vortices within the graphene ensemble by introducing an optical vortex to the initial beam. This scheme holds promise for applications in high-dimensional quantum information processing.
我们利用麦克斯韦-布洛赫方程，研究了具有三个能级且与两个激光脉冲相互作用的朗道量子化石墨烯结构中的非线性参量产生和光束传播动力学。通过在石墨烯样品的一个跃迁上施加激光场，同时初始时保持第二束光不存在，石墨烯样品独特的制备方式及其与激光辐射的弱相互作用，导致在不同跃迁中参量产生新的激光束。我们研究了各种系统参数对产生光束的效率以及两束光传播动力学的影响。我们的研究结果表明，操纵这些参数可以在传播光束的强度中引发振荡，减轻传播过程中的吸收损耗从而实现更早的弛豫，并提高从初始光束到产生光束的能量转移效率。此外，我们通过向初始光束引入光学涡旋，展示了石墨烯系综内光学涡旋的转移。该方案在高维量子信息处理应用方面具有前景。
