石墨烯
宽带
物理
光电子学
高次谐波产生
费米能量
光子
谐波
非线性系统
光学
迪拉克费米子
非线性光学
转换器
材料科学
激光器
量子力学
功率(物理)
电子
作者
Giancarlo Soavi,Gang Wang,Habib Rostami,David G. Purdie,Domenico De Fazio,Teng Ma,Birong Luo,Junjia Wang,A. K. Ott,Duhee Yoon,Sean A. Bourelle,Jakob E. Muench,Ilya Goykhman,Stefano Dal Conte,Michele Celebrano,Andrea Tomadin,Marco Polini,Giulio Cerullo,Andrea C. Ferrari
标识
DOI:10.1038/s41565-018-0145-8
摘要
Optical harmonic generation occurs when high intensity light ($>10^{10}$W/m$^{2}$) interacts with a nonlinear material. Electrical control of the nonlinear optical response enables applications such as gate-tunable switches and frequency converters. Graphene displays exceptionally strong-light matter interaction and electrically and broadband tunable third order nonlinear susceptibility. Here we show that the third harmonic generation efficiency in graphene can be tuned by over two orders of magnitude by controlling the Fermi energy and the incident photon energy. This is due to logarithmic resonances in the imaginary part of the nonlinear conductivity arising from multi-photon transitions. Thanks to the linear dispersion of the massless Dirac fermions, ultrabroadband electrical tunability can be achieved, paving the way to electrically-tuneable broadband frequency converters for applications in optical communications and signal processing.
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