Article
Optics
Riyanka Karmakar, Dipendranath Mandal, Megha Shrivastava, K. V. Adarsh
Summary: In this study, we investigate the third-order nonlinear optical response of highly luminescent WS2 quantum dots. Our findings demonstrate their potential applications in optical limiting and quantum information processing, and suggest a promising route for the development of low-dimensional optoelectronic devices.
Article
Nanoscience & Nanotechnology
Chunhui Lu, Mingwei Luo, Yanqing Ge, Yuanyuan Huang, Qiyi Zhao, Yixuan Zhou, Xinlong Xu
Summary: Two-dimensional layered materials exhibit layer-dependent optical properties in nonlinear optics due to complex nonlinear absorption processes, which are difficult to understand. Experimental results show that the nonlinear optical properties of chalcogenide compounds are related to both pump intensity and layer number, with saturable absorption occurring in thick samples and reverse saturable absorption occurring in thin samples. The transition between two-photon absorption and saturable absorption is found to be dependent on the layer thickness and band gaps in the materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Yanmin Xu, Lihe Yan, Anyi Wang, Feng Tian, Xiaojun Huang, Jin Liu
Summary: The optical nonlinearity of molybdenum disulfide/tungsten disulfide heterostructures was investigated using nanosecond laser Z-scan technology, where enhanced saturable absorption behavior was found. The carrier dynamics in the nonlinear response, as well as the enhancement mechanism of the heterostructures, were further clarified using femtosecond time-resolved transient absorption measurements.
Article
Optics
Yibiao Hu, Zhan Yang, Tianju Zhang, Chenduan Chen, Zixin Wang, Ningning Dong, Jun Wang
Summary: In this work, the nonlinear optical properties of Nb4C3Tx are investigated, and it is found that the nanosheets exhibit saturable absorption response in the visible to near-infrared region. The ultrafast carrier dynamics indicate a high optical modulation speed. An all-optical modulator is demonstrated using Nb4C3Tx nanosheets. The study suggests that Nb4C3Tx is a potential material for nonlinear devices.
Article
Nanoscience & Nanotechnology
Rashid A. Ganeev, V. S. Popov, A. Zvyagin, N. A. Lavrentyev, A. E. Mirofyanchenko, E. Mirofyanchenko, I. A. Shuklov, O. Ovchinnikov, V. P. Ponomarenko, V. F. Razumov
Summary: Bismuth telluride nanoparticles exhibit nonlinear optical properties including saturable absorption and positive nonlinear refraction. Stronger excitation leads to reverse saturable absorption dominating over other nonlinear optical processes. In thin films containing these nanoparticles, significant growth of the nonlinear optical parameters is achieved compared to colloidal Bi2Te3 NPs.
Article
Chemistry, Multidisciplinary
Hui Li, Saiyi Chen, Danil W. Boukhvalov, Zhiyang Yu, Mark G. Humphrey, Zhipeng Huang, Chi Zhang
Summary: This study explores the modulation of nonlinear optical (NLO) properties of MXenes (Ti3C2Tx) through surface terminations. The results show that changing the surface terminations leads to variation in the effective NLO absorption coefficient and different saturable absorption and reverse saturable absorption behaviors.
Article
Optics
Nathalie Vermeulen
Summary: This article reviews the nonlinear-optical experiments with graphene, focusing particularly on its third-order nonlinearities. Graphene has shown remarkable saturable absorption properties and strong nonlinear refraction effects, which hold promise for practical applications in nonlinear-optical devices. The article discusses the relevant material parameters for future research and development and highlights specific features of graphene's linear and nonlinear-optical properties that are sometimes overlooked. The author concludes by sharing their perspective on the opportunities and remaining challenges in using graphene for nonlinear-optical applications.
Article
Optics
Qianqian Hao, Kun Ye, Mimi Dong, Jie Liu, Zhongyuan Liu
Summary: High quality monolayer WS2 was fabricated by chemical vapor deposition method, demonstrating its nonlinear optical response for the first time. A robust continuous-wave mode-locked nanosecond laser with a repetition rate of 93.1 MHz was achieved, marking the highest repetition rate of nanosecond pulses from CWML lasers.
Article
Materials Science, Multidisciplinary
Yuning Liang, Wenjie Hu, Xue Yuan, Zaiping Zeng, Baohua Zhu, Yuzong Gu
Summary: In this study, the influence of the coordination numbers of metal-organic frameworks (MOFs) on their nonlinear optical (NLO) properties is investigated for the first time. Different coordination numbers of MOFs are synthesized using trifluoroacetic acid as an auxiliary agent and their NLO properties are tested. The results show that MOFs with high coordination numbers can effectively modulate their NLO absorption properties from saturable absorption to reverse saturable absorption by increasing the excitation intensity. First-principles calculations demonstrate that a change in the coordination numbers leads to a change in the charge transfer from metal to ligand, resulting in different NLO responses. MOFs with a high coordination number have potential applications in novel optical switches or logic gates.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yiduo Wang, Yingwei Wang, Yulan Dong, Li Zhou, Hao Wei, Mengqiu Long, Si Xiao, Jun He
Summary: In this study, the ultrafast nonlinear optical properties of alpha-tellurene were investigated, revealing enhanced NLO response in the ultraviolet-visible absorption spectral region. Additionally, it was found that probe pulses with higher photon energies result in smaller differential transmission signals.
Article
Physics, Applied
Weimin Chen, Wenbin Xiang, Chunzheng Bai, Baohua Zhu, Bing Gu, Changgui Lv, Jiayu Zhang
Summary: Amorphous GeSe films were prepared by vacuum thermal evaporation and exhibited polycrystalline phase after annealing. The films showed reverse saturable absorption and self-focusing phenomenon. The annealed recrystallized GeSe films had significantly improved nonlinear optical parameters and potential applications in optical limiting devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Bingkun Chen, Qianwen Zhang, Xiong Shen, Dayu Huang, Chenggang Yuan, Yuting Wang, Qiuyun Ouyang, Xuan Fang, Xue Chen
Summary: The MAPbBr3 perovskite and MAPbBr3/PMMA organic glasses were successfully synthesized, showing excellent optical properties. The nonlinear absorption coefficient of MAPbBr3/PMMA is competitive with perovskite materials, and its stability over time proves its potential for future optical limiting devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Sofiya Karankova, Oleksiy Kovalchuk, Sungjae Lee, Bowon Ryu, Siam Uddin, Hyowon Moon, Yong-Won Song
Summary: We investigate the optical nonlinearities of transfer-free graphene synthesized by the atomic carbon spraying (ACS) method, and compare it with graphene prepared by chemical vapor deposition (CVD) and reduced graphene oxides (rGOs) by electro-spraying (ES). The three nanocrystal structures are characterized by transmission electron microscopy and Raman analysis. The nonlinear properties of ACS graphene are found to be comparable to CVD graphene and significantly higher than ES rGOs, demonstrating the unimpaired nonlinear properties of graphene prepared by the ACS method. The saturation intensity of ACS graphene is measured to be 32.14 MW cm(-2), an order of magnitude lower than conventional ES rGOs.
APPLIED SURFACE SCIENCE
(2023)
Article
Optics
Xiaobo Li, Xin Chen, Ning Wei, Chenduan Chen, Zhan Yang, Haijiao Xie, Jiajing He, Ningning Dong, Yaping Dan, Jun Wang
Summary: This study explores the wavelength-dependent and pulse-width-dependent nonlinear optical properties of liquid-phase exfoliated MoSSe nanosheets. The results show that the saturable absorption response of MoSSe nanosheets in the visible region is better than that in the near-infrared region, and the response under longer pulse excitation is better. Furthermore, a phase modulator integrated with a monolayer MoSSe into a silicon slot waveguide is designed and optimized to achieve high optical extinction. MoSSe exhibits satisfactory nonlinear optical properties and has excellent potential for applications in optoelectronic devices.
Article
Chemistry, Physical
Marta Gordel-Wojcik, Magdalena Malik, Agnieszka Siomra, Marek Samoc, Marcin Nyk
Summary: In this study, wide spectral measurements of the nonlinear optical properties of silver sulfide quantum dots in aqueous solutions were conducted using the Z-scan technique. The relationship between the properties of the quantum dots and the variation of the material that covers their surface was also evaluated. The study identified various nonlinear optical effects, including two-photon absorption and nonlinear refraction.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Dingwei Chen, Zhiyuan Zhao, Nai Jiang, Hui Zhu, Shuai Zhao, Pingheng Tan, Dahai Wei, Houzhi Zheng, Chao Shen
Summary: This paper demonstrates a magnetically regulated circular polarized resonant microcavity using an ultrathin ferrimagnetic composite metal layer. A huge magnetic circular dichroism signal is observed when a small magnetic field is applied, and the cavity resonant frequency and polarization performance can be tuned successfully.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Correction
Physics, Multidisciplinary
Kun Ni, Jinxiang Du, Jin Yang, Shujuan Xu, Xin Cong, Na Shu, Kai Zhang, Aolei Wang, Fei Wang, Liangbing Ge, Jin Zhao, Yan Qu, Kostya S. Novoselov, Pingheng Tan, Fuhai Su, Yanwu Zhu
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Ceramics
Tianze Sun, Zongwei Xu, Jintong Wu, Yexin Fan, Fei Ren, Ying Song, Long Yang, Pingheng Tan
Summary: This study investigated the mechanism of defect formation during ion implantation for color center preparation. The samples were characterized by photoluminescence spectrum and electron paramagnetic resonance. It was found that hydrogen ion implantation had an optimal implantation fluence for the formation of VCVSi and VV color centers. Molecular dynamics simulation and experimental results were compared to confirm the existence of the optimal implantation fluence.
CERAMICS INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Fei Pan, Kun Ni, Tao Xu, Huaican Chen, Yusong Wang, Ke Gong, Cai Liu, Xin Li, Miao-Ling Lin, Shengyuan Li, Xia Wang, Wensheng Yan, Wen Yin, Ping-Heng Tan, Litao Sun, Dapeng Yu, Rodney S. S. Ruoff, Yanwu Zhu
Summary: This study reports the gram-scale preparation of a new type of carbon, long-range ordered porous carbon (LOPC), from C-60 powder catalyzed by alpha-Li3N. LOPC consists of connected broken C-60 cages that maintain long-range periodicity. The preparation of LOPC enables the discovery of other crystalline carbons starting from C-60(s).
Article
Nanoscience & Nanotechnology
Heng Wu, Miao-Ling Lin, Yu-Chen Leng, Xue Chen, Yan Zhou, Jun Zhang, Ping-Heng Tan
Summary: Interfacial coupling in ternary vdWHs was probed and quantified using low-frequency Raman spectroscopy. The study provides important insights for the fabrication of low-dimensional vdWHs-based electronic and optoelectronic devices.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Xue Chen, Sven Reichardt, Miao-Ling Lin, Yu-Chen Leng, Yan Lu, Heng Wu, Rui Mei, Ludger Wirtz, Xin Zhang, Andrea C. Ferrari, Ping-Heng Tan
Summary: Graphene is used as a platform to study quantum interference pathways by adjusting doping or laser excitation energy. The Raman excitation profile of graphene can provide insights into the lifetimes of intermediate electronic excitations and quantum interference. By tuning the laser excitation energy, the Raman scattering pathways in doped graphene are controlled. Doping-enhanced electron-electron interactions dominate the lifetimes of Raman scattering pathways and weaken Raman interference.
Article
Chemistry, Multidisciplinary
He Hao, Miao-Ling Lin, Bo Xu, Heng Wu, Yuechen Wang, Hailin Peng, Ping-Heng Tan, Lianming Tong, Jin Zhang
Summary: The characterization of interlayer coupling in two-dimensional van der Waals heterostructures (vdWHs) is crucial for understanding their quantum behaviors and structural functionalities. Twisted bilayer graphene (tBLG) provides a universal strategy to enhance layer-breathing (LB) phonons in vdWHs. By resonantly exciting electrons in tBLG, LB phonons extended over the entire layers in vdWHs can be strongly coupled, and this coupling can be tuned by the twist angle of tBLG. This method of enhancing LB phonons by tBLG is promising for investigating electron-phonon coupling and interlayer interaction in related vdWHs.
Article
Physics, Applied
Yan Zhou, Shi Zhou, Shun Wan, Bo Zou, Yuxia Feng, Rui Mei, Heng Wu, Naoteru Shigekawa, Jianbo Liang, Pingheng Tan, Martin Kuball
Summary: A GaN/Si heterointerface without any buffer layer has been successfully fabricated at room temperature through surface activated bonding, solving the problem of lattice and thermal expansion coefficient mismatches between GaN and Si. The residual stress states and interfacial microstructures of the GaN/Si heterostructures were systematically investigated. It was found that the GaN layers bonded to Si by surface activated bonding exhibited significantly relaxed and uniform small tensile stress, mainly attributed to the amorphous layer formed at the bonding interface. Appropriate thermal annealing was found to significantly tune the interfacial microstructure and stress states of bonded GaN/Si heterointerfaces. This work enables the direct integration of GaN with Si CMOS technology with high quality thin interfaces and holds great potential for wafer-scale low-cost fabrication of GaN electronics.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Wen-Guang Zhou, Dong-Wei Jiang, Xiang-Jun Shang, Dong-Hai Wu, Fa-Ran Chang, Jun-Kai Jiang, Nong Li, Fang-Qi Lin, Wei-Qiang Chen, Hong-Yue Hao, Xue-Lu Liu, Ping-Heng Tan, Guo-Wei Wang, Ying-Qiang Xu, Zhi-Chuan Niu
Summary: In this study, we compared the photoluminescence (PL) properties of AlInAsSb digital alloy samples with different periods grown on GaSb (001) substrates by molecular beam epitaxy. The temperature-dependent S-shape behavior was observed and explained using a thermally activated redistribution model within a Gaussian distribution of localized states. There are two different mechanisms for the origin of the PL intensity quenching in the AlInAsSb digital alloy. The high-temperature activation energy E (1) is positively correlated with the interface thickness, while the low-temperature activation energy E (2) is negatively correlated with the interface thickness. A quantitative high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) study showed that the interface quality improves as the interface thickness increases. Our results confirmed that E (1) comes from carrier trapping at a state in the InSb interface layer, while E (2) originates from the exciton binding energy due to the roughness of the AlAs interface layer.
Article
Chemistry, Multidisciplinary
Yufei Sun, Shujia Yin, Ruixuan Peng, Jia Liang, Xin Cong, Yi Li, Chenyu Li, Bolun Wang, Miao-Ling Lin, Ping-Heng Tan, Chunlei Wan, Kai Liu
Summary: In this study, an abnormal Raman behavior, the absence of the A1g mode, is observed in cetyltrimethylammonium bromide (CTAB)-intercalated MoS2 superlattice. This abnormal behavior is different from the softening of the A1g mode induced by surface engineering or electric-field gating. Interestingly, the A1g peak gradually appears under strong laser illumination, heating, or mechanical indentation, accompanied by the migration of intercalated CTA+ cations. The abnormal Raman behavior is mainly attributed to the constraint of the out-of-plane vibration due to intercalations and resulting severe electron doping. Our work provides new insights into the Raman spectra of 2D semiconducting materials and offers a new approach for developing next-generation devices with tunable structures.
Article
Materials Science, Multidisciplinary
Nai Jiang, Jia Shi, Heng Wu, Dong Zhang, Hui Zhu, Xinfeng Liu, Ping-Heng Tan, Kai Chang, Houzhi Zheng, Chao Shen
Summary: In this study, the temperature-dependent exciton linewidths of CVD-grown large-area monolayer, 2H and 3R-stacking bilayer WS2 are investigated using a self-designed reflective magnetic circular dichroism (MCD) spectrum. It is found that 2H-bilayer WS2 exhibits a significantly larger exciton linewidth compared with monolayer and 3R bilayer, which can be attributed to the appearance of new phonon-assisted relaxation channels caused by interlayer coupling. Meanwhile, 3R bilayer with a redshifted exciton peak has a narrower linewidth than 2H phase because the interlayer hopping is suppressed, resulting in the absence of interlayer scattering channel.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Qundong Fu, Xin Cong, Xiaodong Xu, Song Zhu, Xiaoxu Zhao, Sheng Liu, Bingqing Yao, Manzhang Xu, Ya Deng, Chao Zhu, Xiaowei Wang, Lixing Kang, Qingsheng Zeng, Miao-Ling Lin, Xingli Wang, Bijun Tang, Jianqun Yang, Zhili Dong, Fucai Liu, Qihua Xiong, Jiadong Zhou, Qijie Wang, Xingji Li, Ping-Heng Tan, Beng Kang Tay, Zheng Liu
Summary: 2D Tellurene (2D Te) exhibits a strong nonlinear optical response in the infrared region due to its unique structure, making it a promising candidate for efficient nonlinear semiconductors. The large second-order nonlinear optical susceptibility (chi(2)) of 2D Te is significantly higher than that of other 2D materials, reaching a peak value at approximately 2300 nm. The exceptional performance is attributed to the presence of large Berry curvature dipole (BCD) located at the Weyl points of 2D Te.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Analytical
Heng Wu, Miao-Ling Lin, Yan Zhou, Xin Zhang, Ping-Heng Tan
ANALYTICAL CHEMISTRY
(2023)
Article
Physics, Applied
Heng Wu, Yan Zhou, Yu-Xin Cai, Miao-Ling Lin, Lijun Zhang, Ping-Heng Tan
Summary: In this study, the interlayer modes in few-layer InSe were systematically investigated using low-frequency Raman spectroscopy. It was found that the commonly used linear chain model is inadequate in accurately describing the frequencies of interlayer shear modes in InSe due to the influence of weak in-plane intralayer In-In bonding. Our study reveals the non-negligible contribution of weak intralayer bonding to the corresponding interlayer vibrations in two-dimensional materials.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Seda Kutkan, Balaji Dhanabalan, Miao-Ling Lin, Ping-Heng Tan, Alexander Schleusener, Milena P. Arciniegas, Roman Krahne
Summary: Organic-inorganic low-dimensional layered metal-halide perovskites are semiconductors with tunable optoelectronic properties. The interaction between organic cations and the inorganic lattice leads to lattice distortions that affect the band structure and exciton energy levels. The number of peaks in the band-edge emission and their decay dynamics depend on the type of organic cation and the induced lattice distortions. The involvement of phonons and higher order phonon scattering processes in exciton recombination dynamics contribute to thermal broadening of the emission linewidth.
