Broadband ultrafast nonlinear optical response of few-layers graphene: toward the mid-infrared regime
Gapless linear energy dispersion of graphene endows it with unique nonlinear optical properties, including broadband nonlinear absorption and giant nonlinear refractive index. Herein, we experimentally observed that fewlayers graphene has obvious nonlinear absorption and large nonlinear refraction, as investigated by the Z-scan technique in the mid-infrared (mid-IR) regime. Our study may not only, for the first time to our knowledge, verify the giant nonlinear refractive index of graphene (～10?7 cm2∕W) at the mid-IR, which is 7 orders of magnitude larger than other conventional bulk materials, but also provide some new insights for graphene-based mid-IR photonics, potentially leading to the emergence of several new conceptual mid-IR optoelectronics devices.
基金项目：This work is partially supported by the National 973 Program of China (Grant No. 2012CB315701), and the National Natural Science Foundation of China (Grant Nos. 61205125, 61222505, and 61475102).
Yaqin Jiang：Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics,Hunan University, Changsha 410082, China
Shunbin Lu：SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University,Shenzhen 518060, China
Bingxin Shi：Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics,Hunan University, Changsha 410082, China
Chujun Zhao：Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics,Hunan University, Changsha 410082, China
Han Zhang：SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University,Shenzhen 518060, China
Shuangchun Wen：Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics,Hunan University, Changsha 410082, China
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Lili Miao, Yaqin Jiang, Shunbin Lu, Bingxin Shi, Chujun Zhao, Han Zhang, and Shuangchun Wen, "Broadband ultrafast nonlinear optical response of few-layers graphene: toward the mid-infrared regime," Photonics Research 3(5), 214-219 (2015)