同名作者【Yongsheng Chen】论文列表 -- 中国光学期刊网

同名作者【Yongsheng Chen】论文列表

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Optoelectronics

Ultraviolet-to-microwave room-temperature photodetectors based on three-dimensional graphene foams

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Yifan Li ¹Yating Zhang ^1,*Yu Yu ¹Zhiliang Chen ¹[ ... ]Jianquan Yao ^1,6

Author Affiliations

Abstract

¹ Key Laboratory of Optoelectronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China

² Department of Applied Physics and Materials, Research Centre, The Hong Kong Polytechnic University, Hong Kong, China

³ National Institute for Advanced Materials, Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Key Laboratory of Functional Polymer Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Materials Science and Engineering, Nankai University, Tianjin 300071, China

⁴ e-mail: shengquan@tju.edu.cn

⁵ e-mail: apafyan@polyu.edu.hk

⁶ e-mail: jqyao@tju.edu.cn

Highly sensitive broadband photodetection is of critical importance for many applications. However, it is a great challenge to realize broadband photodetection by using a single device. Here we report photodetectors (PDs) based on three-dimensional (3D) graphene foam (GF) photodiodes with asymmetric electrodes, which show an ultra-broadband photoresponse from ultraviolet to microwave for wavelengths ranging from

10^{2}

10^{6} nm

. Moreover, the devices exhibit a high photoresponsivity of

10^{3} A \cdot W^{? 1}

, short response time of 43 ms, and 3 dB bandwidth of 80 Hz. The high performance of the devices can be attributed to the photothermoelectric (PTE, also known as the Seebeck) effect in 3D GF photodiodes. The excellent optical, thermal, and electrical properties of 3D GFs offer a superior basis for the fabrication of PTE-based PDs. This work paves the way to realize ultra-broadband and high-sensitivity PDs operated at room temperature.

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Photonics Research

2020, 8(3): 03000368

PHOTONICS BASED ON TWO DIMENSIONAL MATERIALS

Sign of differential reflection and transmission in pump-probe spectroscopy of graphene on dielectric substrate

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Chengmin Gao ¹Xin Zhao ²Jun Yao ¹Xiao-Qing Yan ^1,*[ ... ]Jian-Guo Tian ¹

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.