journal article·2022-03-22

Controllable Synthesis of Narrow-Gap van der Waals Semiconductor Nb2GeTe4 with Asymmetric Architecture for Ultrafast Photonics

Yongping Dai, Qiang Yu, Xiaoxin Yang, Kun Guo, Yan Zhang, Yushuang Zhang, Junrong Zhang, Jie Li, Jie Chen, Haiqin Deng, Tianhao Xian, Xiao Wang, Jian Wu, Kai Zhang

ACS Nano· Volume 16· Issue 3
Publisher page

Abstract

Ultrafast photonics has become an interdisciplinary topic of great consequence due to the spectacular progress of compact and efficient ultrafast pulse generation. Wide spectrum bandwidth is the key element for ultrafast pulse generation due to the Fourier transform limitation. Herein, monoclinic Nb2GeTe4, an emerging class of ternary narrow-gap semiconductors, was used as a real saturable absorber (SA), which manifests superior wide-range optical absorption. The crystallization form and growth mechanism of Nb2GeTe4 were revealed by a thermodynamic phase diagram. Furthermore, the Nb2GeTe4–SA showed reliable saturation intensity and larger modulation depth, ascribed to a built-in electric field driven by the asymmetric crystal architecture confirmed via X-ray diffraction, polarized Raman spectra, and scanning transmission electron microscopy. Based on the Nb2GeTe4–SA, femtosecond mode-locked operation with good overall performance was achieved by a properly designed ring cavity. These results suggest that Nb2GeTe4 shows great promise for ultrafast photonic applications and arouse interests in exploring the intriguing properties of the ternary van der Waals material family.
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Research context

OpenAlex topics: Advanced Fiber Laser Technologies · Mechanical and Optical Resonators · Photonic and Optical Devices

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Affiliations

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

Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China

College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China

Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, China

Shanghai IC R&D Center, Shanghai 201210, China

State Key Laboratory of Advanced Optical Communication System and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

Funding

National Natural Science Foundation of China · State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and astronautics · Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences · Shenzhen Institutes of Advanced Technology, Chinese Academy of Science

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