报告题目:二维材料中的非线性光学
报告人:程晋罗 副研究员 (中科院长春光学精密机械与物理研究所)
报告时间:2019年7月29日(周一)09:00
报告地点:物理楼313报告厅
报告人简介:程晋罗,中国科学院长春光学精密机械与物理研究所副研究员。他于2002年获得中国科学技术大学应用物理学学士学位,2007年获得中国科学技术大学物理系凝聚态理论博士学位。之后他分别在中国科学技术大学、多伦多大学及布鲁塞尔自由大学从事博士后研究。他的研究方向集中在半导体、金属、及新型二维材料中线性和非线性光学性质的理论研究,研究手段包括模型计算、第一性原理计算、及动力学演化等;另外也涉及一维光子晶体和二维材料相结合系统中的非线性光学等相关方向。他是期刊Journal of Physics: Photonics的编委成员。
报告摘要:We present a theoretical framework for nonlinear optics of graphene and other 2D materials in layered structures. We derive a key equation to find the effective electric field and the sheet current density in the 2D material for given incident light beams. Our approach takes into account the effect of the surrounding environment and characterizes its contribution as a structure factor. We apply our approach to two experimental setups, and discuss the structure factors for several nonlinear optical processes including second harmonic generation, third harmonic generation, and parametric frequency conversion. Our systematic study gives a strict extraction method for the nonlinear coefficients, and provides new insights in how layered structures influence the nonlinear signal observed from 2D materials.
References:
1. J. Phys. Photonics 1, 015002 (2019)
2. New J. Phys 16, 053014 (2014)
3. Phys. Rev. B 91, 235320 (2015)