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2D Nb
2
CT
x
MXene/MoS
2
heterostructure construction for nonlinear optical absorption modulation
Yiduo Wang
1
Yingwei Wang
1,*
Yulan Dong
2
Li Zhou
1
[ ... ]
Jun He
1,**
Author Affiliations
Abstract
1
Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha 410083, China
2
Key Laboratory of Hunan Province for Statistical Learning and Intelligent Computation, School of Mathematics and Statistics, Hunan University of Technology and Business, Changsha 410205, China
Two-dimensional (2D) nonlinear optical mediums with high and tunable light modulation capability can significantly stimulate the development of ultrathin, compact, and integrated optoelectronics devices and photonic elements. 2D carbides and nitrides of transition metals (MXenes) are a new class of 2D materials with excellent intrinsic and strong light-matter interaction characteristics. However, the current understanding of their photo-physical properties and strategies for improving optical performance is insufficient. To address this issue, we rationally designed and
in situ
synthesized a 2D Nb
2
C/MoS
2
heterostructure that outperforms pristine Nb
2
C in both linear and nonlinear optical performance. Excellent agreement between experimental and theoretical results demonstrated that the Nb
2
C/MoS
2
inherited the preponderance of Nb
2
C and MoS
2
in absorption at different wavelengths, resulting in the broadband enhanced optical absorption characteristics. In addition to linear optical modulation, we also achieved stronger near infrared nonlinear optical modulation, with a nonlinear absorption coefficient of Nb
2
C/MoS
2
being more than two times that of the pristine Nb
2
C. These results were supported by the band alinement model which was determined by the X-ray photoelectron spectroscopy (XPS) experiment and first-principal theory calculation. The presented facile synthesis approach and robust light modulation strategy pave the way for broadband optoelectronic devices and optical modulators.
MXenes
optical properties modulation
in situ growth
carriers transfer
nonlinear optical absorption
PDF全文
Full Text
Opto-Electronic Advances
2023, 6(10): 220162
Nonlinear Optics
Revealing the intrinsic nonlinear optical response of a single MoS
2
nanosheet in a suspension based on spatial self-phase modulation
Download:662次
Si Xiao
1
Ying Ma
1
Yilin He
1
Yiduo Wang
1
[ ... ]
Yingwei Wang
1,3,*
Author Affiliations
Abstract
1
Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, China
2
e-mail: junhe@csu.edu.cn
3
e-mail: wyw1988@csu.edu.cn
The reorientation of 2D materials caused by nonlocal electron coherence is the formation mechanism of 2D material spatial self-phase modulation under laser irradiation, which is widely known as the “wind-chime” model. Here, we present a method that provides strong evidence for the reorientation of 2D-material-induced spatial self-phase modulation. The traditional “wind-chime” model was modified by taking into account the attenuation, i.e., damping of the incident light beam in the direction of the optical path. Accordingly, we can extract the nonlinear refractive index of a single
MoS
2
nanosheet, instead of simply obtaining the index from an equivalent
MoS
2
film that was constructed by all nanosheets. Our approach introduces a universal and accurate method to extract intrinsic nonlinear optical parameters from 2D material systems.
PDF全文
Full Text
Photonics Research
2020, 8(11): 11001725
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