DataVXphysica status solidi (RRL) – Rapid Research LettersPaper
journal article·2021-11

Transient Anisotropic Photocurrent Induced Terahertz Emission from the Surface of Black Phosphorus

Lipeng Zhu, Yuanyuan Huang, Chuan He, Yue Wu, Yixuan Zhou, Zeyu Fan, Jun Dong, Kai Zhang, Xinlong Xu

physica status solidi (RRL) – Rapid Research Letters· Volume 15· Issue 11
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Source abstract

Abstract

Anisotropic second‐order nonlinear optical effects have not been experimentally observed in bulk black phosphorus (BP) because of the presence of inversion symmetry. Herein, it is experimentally shown that the anisotropic second‐order nonlinear optical effect can be observed at the surface of BP with inversion symmetry breaking by terahertz emission spectroscopy. The dependence of the terahertz emission on the azimuthal angle, pump power, and polarization states is investigated in a reflection configuration. The results can be well fitted by photogalvanic theory, which proves that the terahertz emission process is dominated by a second‐order nonlinear optical effect. In addition, it is demonstrated that the oxidization process at the surface can protect the terahertz surface emission from the bulk BP. These results prove the BP crystal can be used as an alternative terahertz emitter and the radiation mechanism shows that the second‐order nonlinear optical effect can occur at the surface of the bulk BP crystal.
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Research context

OpenAlex topics: 2D Materials and Applications · Terahertz technology and applications · Advanced Fiber Laser Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Electronic Engineering Xi'an University of Posts and Telecommunications Xi'an 710121 China

Shaanxi Joint Lab of Graphene State Key Laboratory of Western Energy Photonics Technology State Key Lab Incubation Base of Photoelectric Technology and Functional Materials International Collaborative Center on Photoelectric Technology and Nano Functional Materials Institute of Photonics & Photon-Technology Northwest University Xi'an 710069 China

CAS Key Laboratory of Nanophotonic Materials and Devices & Key Laboratory of Nanodevices and Applications i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO) Chinese Academy of Sciences Suzhou 215123 China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Shaanxi Province

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