Author Affiliations
Abstract
1 Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
2 College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
3 Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Teda Applied Physics School and School of Physics , Nankai University, Tianjin 300457, China
Stable porphyrin-oxygenated carbon nanomaterial dispersions were prepared by blending porphyrin solutions with hydroxyl groups modified multi-walled carbon nanotubes (MWNTs-OH) and graphene oxide (GO) dispersions, respectively. Optical nonlinearity and optical limiting (OL) property of these blends are investigated in nanosecond regime. Results show that the OL performance of the blends can be tuned by changing the concentrations ratio of porphyrin and oxygenated carbon nanomaterials. The high concentration of oxygenated carbon nanomaterial leads to the poor OL performance. However, with the moderate concentration, the blends exhibit the low threshold value of OL and the enhanced OL performance at high fluence region. The superior OL performance can be attributed to complementary mechanisms and possible photoinduced electron or energy transfer between porphyrin moiety and oxygenated carbon nanomaterials.
光电子快报（英文版）
2015, 11(3): 161
Author Affiliations
Abstract
1 The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Teda Applied Physics Institute and
School of Physics, Nankai University, Tianjin 300457, China
2 College of Science, Tianjin Polytechnic University, Tianjin 300387, China
3 The Key Laboratory of Functional Polymer Materials and Center for Nanoscale Science & Technology,
Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
Pump-probe differential reflection and transmission spectroscopy is a very effective tool to study the nonequili-brium carrier dynamics of graphene. The reported sign of differential reflection from graphene is not explicitly explained and not consistent. Here, we study the differential reflection and transmission signals of graphene on a dielectric substrate. The results reveal the sign of differential reflection changes with the incident direction of the probe beam with respect to the substrate. The obtained theory can be applied to predict the differential signals of other two-dimensional materials placed on various dielectric substrates.
Thin films Thin films other properties other properties Nonlinear optics Nonlinear optics materials materials Optical properties Optical properties Ultrafast nonlinear optics Ultrafast nonlinear optics Photonics Research
2015, 3(2): 020000A1
北京交通大学 全光网络与现代通信网教育部重点实验室, 北京 100044
从载波相位调制解调原理出发,理论分析了载波频率漂移对解调结果的影响.通过对解调公式的推导及分析,给出了频率漂移对解调结果影响的公式.结果表明,当混频基频信号的频率与载波频率存在微小频差时,解调结果将出现低频调制,严重影响解调效果;仿真及实验验证结果与理论分析完全吻合.
相位生成载波 频率漂移 干涉仪 光纤传感器 PGC Frequency drift Interferometer Fiber optic sensor
