Dual-wavelength cross absorption modulation theory based on graphene

被引：5
作者：
Ren, Yang Yang [1 ,2 ,3 ]
Feng, Ming [1 ,2 ,3 ]
Zhang, Kang [1 ,2 ,3 ]
Yang, Jie [1 ,2 ,3 ]
Miao, Yu [1 ]
Song, Fei Fei [1 ,2 ]
Liu, Zhi Bo [1 ,2 ,3 ]
Song, Feng [1 ,2 ,3 ]
机构：
[1] Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China
[2] Nankai Univ, Key Lab Weak Light Nonlinear Photon, Minist Educ, Tianjin 300457, Peoples R China
[3] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China
来源：
PHYSICA SCRIPTA | 2019年 / 94卷 / 12期
关键词：
graphene; modulation; dynamics of nonlinear optical systems; SATURABLE ABSORBER; FIBER LASER; NANOTUBE;
D O I：
10.1088/1402-4896/ab366a
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The cross absorption modulation effect on monolayer undoped graphene is analyzed theoretically under ultrafast dual-wavelength pulses. A four-level system based on the two-level system with redistribution of electrons in the intraband relaxation and Pauli exclusion principle of interband transition is established to analyze this effect. By adjusting the modulation intensity, modulation wavelength and intraband relaxation time, the variations in output characteristics are taken into consideration: signal saturable absorption is decreased with the enhancement of modulation intensity; shorter modulation wavelength leads to larger modulation depth in high modulation intensity region; with the increasement of modulation wavelength, the modulation saturation intensity is decreased by nearly one order of magnitude. Additionally, the growth of intraband relaxation time also leads to a sharp decline in modulation saturation intensity; the modulation depth of signal light can be considerably adjusted by doping graphene. The simulation results may provide theoretical support in experimental design such as controllable saturable absorber, variable synchronous pulse laser and flexible all-optical modulator.
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页数：8
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