题　目：Optical Nonlinearity of Graphene
报告人：Dr.Jinluo Cheng（比利时布鲁塞尔大学）
时　间：4月3日（周五），上午10:00-11:00
地　点：南校区第一实验楼423会议室

报告摘要：

We theoretically consider the third order nonlinear optical response of doped graphene by perturbatively solving the semiconductor Bloch equation, with describing scattering effects phenomenologically in a relaxation time approximation. At zero temperature and taking the linear dispersion approximation around the Dirac points, we obtain analytic expressions for the third order conductivities relevant to a number of different physical processes: Third harmonic generation, Kerr effects and two photon absorption, two-color coherent control, and parametric frequency conversion. We also consider a special case where one of the electric fields is taken as a dc field, and we investigate the dc-current/field induced second order optical nonlinearities.

Taking the zero temperature formula as a starting point, we further construct the nonlinear conductivities at room temperature, and describe the response of graphene to a laser pulse with finite duration. We compare our calculations with the results of recent experiments.

个人简介：

•2002-2007，中国科学技术大学，博士

•2007-2013，加拿大多伦多大学，博士后

•2013-现在，比利时布鲁塞尔大学，博士后