Article
Chemistry, Multidisciplinary
Isha M. Datye, Alwin Daus, Ryan W. Grady, Kevin Brenner, Sam Vaziri, Eric Pop
Summary: Strain can significantly enhance the electron mobility of two-dimensional semiconductors, which is crucial for applications such as flexible strain sensors.
Article
Nanoscience & Nanotechnology
Hiroto Shinomiya, Hiroshi Sugimoto, Tatsuki Hinamoto, Yan Joe Lee, Mark L. Brongersma, Minoru Fujii
Summary: Optical antennas play an important role in controlling photonic environments and enhancing light emission from two-dimensional transition-metal dichalcogenides. Dielectric nanoantennas with multipolar Mie resonances offer unique advantages for simultaneous enhancement of absorption and emission processes. In this study, a double resonance nanoantenna composed of a crystalline silicon nanoparticle is used to modify the photoluminescence behavior of monolayer MoS2. The coupling of the excitation process to the magnetic quadrupole resonance and the emission process to the magnetic dipole resonance results in significant modification of the spectral shape and enhancement of the photoluminescence intensity.
Article
Chemistry, Physical
Ashish Soni, Dushyant Kushavah, Li-Syuan Lu, Wen-Hao Chang, Suman Kalyan Pal
Summary: Utilizing the excess energy from photoexcitation to improve the efficiency of next-generation light-harvesting devices is possible. Multiple exciton generation (MEG) in semiconducting materials can break the conversion efficiency limit of photovoltaic devices. Monolayer transition metal dichalcogenides (TMDs) have high absorption coefficients and show efficient MEGs with low threshold energy and high (86%) efficiency in MoS2. The results suggest that van der Waals layered materials could be a potential candidate for flexible and efficient next-generation solar cells and photodetectors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yunyun Dai, Yadong Wang, Susobhan Das, Shisheng Li, Hui Xue, Ahmadi Mohsen, Zhipei Sun
Summary: The study reports broadband enhancement of optical nonlinearity in monolayer MoS2 with plasmonic structures, demonstrating significantly enhanced four-wave mixing with an equivalent third-order nonlinearity in the order of 10(-17) m(2)/V-2. The enhancement factor is up to three orders of magnitude, showing promising potential for nonlinear photonic applications.
Article
Chemistry, Multidisciplinary
Donglin Lu, Yang Chen, Lingan Kong, Chaobo Luo, Zheyi Lu, Quanyang Tao, Wenjing Song, Likuan Ma, Zhiwei Li, Wanying Li, Liting Liu, Qianyuan Li, Xiangdong Yang, Jun Li, Jia Li, Xidong Duan, Lei Liao, Yuan Liu
Summary: A strain-plasmonic coupled 2D photodetector is designed to overcome the limitations of poor light absorption and small detection range in 2D photodetectors. The designed photodetector can broaden the detection range by 60 nm and increase the signal-to-noise ratio by 650%. It also demonstrates built-in potential and photo-switching behavior, constructing a self-powered homojunction photodetector. This approach provides a new strategy for designing high-performance and broadband 2D optoelectronic devices.
Article
Chemistry, Physical
Yu Wang, Mengtao Sun, Lingyan Meng
Summary: The high-order nonlinearity enables larger signal enhancements in two-photon spectroscopy compared to one-photon spectroscopy, important for conducting photoluminescence measurements at the single molecule level. Theoretical investigation on two-photon-excited fluorescence (2pF) of monolayer MoS2 in various tip-enhanced spectroscopy configurations achieved large enhancement factor on the order of 10^5 by optimizing tip parameters. Calculations of radiative and nonradiative decay rates further elucidated the 2pF emission mechanism.
APPLIED SURFACE SCIENCE
(2022)
Article
Optics
Fengkai Meng, Xiaodong Yang, Jie Gao
Summary: In this study, the multiphonon-assisted upconversion photoluminescence (UPL) emission in monolayer MoS2 at elevated temperatures was investigated. The results demonstrated an enhancement of the integrated UPL intensity when the temperature increased from 295 K to 460 K, attributed to the increased phonon population and reduced phonon numbers involved in the UPL process. This research reveals the underlying mechanism of phonon-assisted UPL at high temperatures and provides potential applications in display, nanoscale thermometry, anti-Stokes energy harvesting, and optical refrigeration.
Article
Optics
Pavel Peterka, Artur O. Slobodeniuk, Tomas Novotny, Pawan Suthar, Miroslav Bartos, Frantisek Trojanek, Petr Maly, Martin Kozak
Summary: We experimentally investigate nonperturbative high harmonic generation (HHG) in monolayer MoS2 in the ultraviolet spectral region driven by mid-infrared light. The HHG is influenced by pre-excitation of the monolayer using resonant and near-resonant pulses. The presence of pre-excited carriers suppresses HHG due to ultrafast dephasing caused by electron-electron scattering. Near-resonant excitation with photon energy below the exciton transition shows a fast component in the suppression of HHG yield, which is a consequence of momentum scattering at carriers excited by two-photon transition.
Article
Nanoscience & Nanotechnology
Dikun Li, Hua Lu, Yangwu Li, Shouhao Shi, Zengji Yue, Jianlin Zhao
Summary: Topological insulators (TI), as fantastic nanomaterials with excellent electrical and optical properties, have attracted attention for their promising applications in optoelectronic devices. Experimental results showed that integrating TI nanoparticles with MoS2 monolayers can greatly enhance photoluminescence (PL) emission and Raman scattering signals. The interaction enhancement is attributed to the generation of localized surface plasmons on the TI nanoparticle, boosting the electric field.
Article
Materials Science, Multidisciplinary
Jianqi Huang, Zhiyong Liu, Teng Yang, Zhidong Zhang
Summary: The first-order resonant Raman spectra of monolayer MoS2 exhibit anomalies under certain conditions, possibly related to optical absorption at specific reciprocal points, and the E Raman tensor varies with laser energy. The anomalous Raman intensity of the E mode under the same circular polarization is consistent with the pseudo-angular-momentum conservation law.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Xiaoli Sun, Lingrui Chu, Feng Ren, Yuechen Jia, Feng Chen
Summary: Transition metal dichalcogenides (TMDs) have unique electric band structures that make them attractive for photonics. However, their atomic-scale thickness limits their optical absorbance, hindering their use in nonlinear optical devices. This study proposes a method to enhance the nonlinear optical properties of TMDs using plasmons from embedded silver nanoparticles (NPs). The results show that MoS2 with non-contact Ag NPs has a significantly higher third-order nonlinear absorption coefficient compared to pure monolayer MoS2 under excitation of 515 nm light. The plasmonic implication also causes a switch from reverse saturable absorption to saturable absorption at 1030 nm.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Chenhua Deng, Kaifei Kang, Zhonghai Yu, Chao Zhou, Sen Yang
Summary: Researchers have designed an Al/AAO/MoS2 trilayer nanocavity structure to regulate the light-matter interaction of MoS2 film, addressing the issue of the extremely low light absorption efficiency of MoS2.
Article
Chemistry, Multidisciplinary
Shiyu Sun, Jingying Zheng, Ruihao Sun, Dan Wang, Guanliang Sun, Xingshuang Zhang, Hongyu Gong, Yong Li, Meng Gao, Dongwei Li, Guanchen Xu, Xiu Liang
Summary: Defect-containing monolayer MoS2 with abundant density of states and effective photoinduced charge transfer resonance becomes a promising and versatile substrate capable of detecting a wide range of dye molecules and enhancing Raman enhancement.
Article
Optics
Yuan-Yuan Yue, Hai-Yu Wang, Lei Wang, Le-Yi Zhao, Hai Wang, Bing-Rong Gao, Hong-Bo Sun
Summary: A systematic investigation was conducted on the interactions of band-edge valley excitons in monolayer MoS2, revealing intravalley coherent coupling processes at room temperature. This study observed intravalley mixing and coherent oscillations in valley excitons of monolayer TMDs, providing insight into the many-body coupling mechanisms of excited valley excitons in 2D TMDs.
LASER & PHOTONICS REVIEWS
(2022)
Article
Nanoscience & Nanotechnology
Zhenming Wang, Jianxun Liu, Xiaoguo Fang, Jiawei Wang, Zhen Yin, Huilin He, Shouzhen Jiang, Meng Zhao, Zongyou Yin, Dan Luo, Ping Shum, Yan Jun Liu
Summary: A simple and cost-effective method to enhance the photoluminescence intensity of monolayer MoS2 using hexagonal symmetric Au metasurfaces is demonstrated. By tuning the localized surface plasmon resonances of the Au metasurfaces with nanospheres of different sizes, the photoluminescence signal of monolayer MoS2 can be significantly enhanced. This fabrication technique opens up a new pathway for plasmon-enhanced light-mater interactions of atomically thin two-dimensional materials.
Article
Optics
Jiang-Tao Liu, Jun Li, Jin-Bao Huang, Xun-Ming Cai, Xiong Deng, De-Jian Zhang
OPTICAL ENGINEERING
(2019)
Article
Physics, Applied
Jiangtao Liu, Menghui Fan, Kun Luo, Qin Yang, Jun Li, Zhenhua Wu
PHYSICAL REVIEW APPLIED
(2019)
Article
Engineering, Electrical & Electronic
Yadong Zhang, Kunpeng Jia, Jiangtao Liu, Yu Pan, Kun Luo, Jiahan Yu, Yongkui Zhang, Hanmin Tian, Zhenhua Wu, Huaxiang Yin
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Chemistry, Physical
Mimi Zhou, Chaobiao Zhou, Kun Luo, Weimin Li, Jiangtao Liu, Ze Liu, Zhenhua Wu
Summary: The electro-optic modulation based on graphene NEMS with super-lubricity demonstrates significantly improved performance with reduced power consumption and faster response speed. It has a wide modulation wavelength range and is not sensitive to the angle of incident light, making it suitable for optoelectronics and optical communication applications.
Article
Optics
Yanli Xu, Hongxu Li, Xin Zhang, Wenjing Liu, Zhengping Zhang, Shuijie Qin, Jiangtao Liu
Summary: This study investigates dynamic color modulation in the composite structure of a graphene microelectromechanical system (MEMS)-photonic crystal microcavity. By controlling graphene's absorption of light at different positions, the transmittance of different colors of light can be regulated, achieving single-color or multiple-color light output and improving resolution.
Article
Chemistry, Physical
Shen Shen, Lei Wu, Shengyi Yang, Qin Yang, Jiang-Tao Liu, Zhenhua Wu
Summary: This paper presents an optical energy harvesting system that converts continuous light energy into vibrational kinetic energy through the photo-magnetic effect, demonstrating potential applications in developing new light-driven micro-nano mechanical motors or light energy harvesting systems.
Article
Physics, Applied
Jun Li, Jiang-Tao Liu, Zhenhua Wu, Wei Huang, Cheng Li
Summary: The intersubband optical absorption of InAs/GaSb type-II quantum wells can be effectively tuned by the electric-field-driven band-inversion transition, making them highly efficient electroabsorption modulators. At low temperature, InAs/GaSb EAMs exhibit excellent performance, suitable for high-speed and low-power-consumption mid to far-infrared optical communications.
PHYSICAL REVIEW APPLIED
(2021)
Article
Materials Science, Multidisciplinary
Guohui Zhan, Zhilong Yang, Kun Luo, Dong Zhang, Wenkai Lou, Jiangtao Liu, Zhenhua Wu, Kai Chang
Summary: Magnetic tunnel junctions (MTJs) with ferromagnetic (FM) and/or antiferromagnetic (AFM) materials are promising for spintronic devices. Two-dimensional magnetic materials provide a flexible platform to design switchable layered FM/AFM MTJs. By using first-principles quantum transport simulations, we designed MTJs based on 2D van der Waals layered MnBi2Te4 and studied their spin-dependent electronic and transport properties. The results show that increasing the thickness of MnBi2Te4 layers leads to higher spin polarization and tunnel magnetoresistance (TMR) ratio. Particularly, when considering spin-orbit coupling (SOC), the TMR ratio can be enhanced significantly.
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This theoretical study investigates photonic-crystal-like devices and microcavities in graphene. The results show that graphene-based devices can be scaled down significantly compared to conventional photonic crystals due to the shorter optical transport wavelength in graphene. The devices have high programmability and can be integrated with traditional microelectronic circuits, offering potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Optics
Jiang-Tao Liu, Yuan Zhang, Xunming Cai, Jinbao Huang, Kun Luo, Hongxu Li, Dejian Zhang, Zhenhua Wu
Summary: Computational ghost imaging can be used to display the characteristics of digital data, especially periodicity. The use of optical imaging methods for analyzing binary data has unique advantages, particularly in anti-interference. Computational ghost imaging enables robust analysis and imaging of binarized signals, even in the presence of strong noise, random amplitude, and phase changes, making it highly valuable in fields such as big data analysis, meteorology, astronomy, economics, and more.
Article
Physics, Applied
Xiong Deng, Ximin Tian, Lirong Ren, Jiangtao Liu, Zhi-Yuan Li
Summary: This study examines the application of graphene-photonic crystal microcavity structures with phase-change-material layers in spectral analysis. It demonstrates that selective absorption of different wavelengths of light can be achieved by varying the crystallinity of the phase-change material, enabling the separation and measurement of different wavelengths of light in the time domain for spectral analysis with submicrosecond time resolution. The device has a simple structure and can be integrated with a chip, showing promising prospects in the fields of biological molecular recognition, biological sensing, and chemical analysis.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Physical
Guanghui Li, Fengman Liu, Shengyi Yang, Jiang-Tao Liu, Weimin Li, Zhenhua Wu
Summary: The micro-electromechanical-system (MEMS) force and acceleration sensor, based on the graphene-induced non-radiative transition, was investigated using analytical solution and finite element analysis methods. The sensor can detect the deflection of the graphene ribbon, applied force, and acceleration with high sensitivity. With its small size and ability to be charged by light irradiation, the MEMS sensor has significant application prospects in the fields of micro-smart devices, wearable devices, and biomedical systems.
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This study investigates photonic-crystal-like devices and microcavities in graphene. The results show that these graphene-based devices can be significantly smaller in size compared to conventional photonic crystals, thanks to the shorter optical transport wavelength in graphene. By changing the applied voltage, the functionality of the devices can be altered, making them highly programmable and adjustable. Furthermore, these devices can be integrated with traditional microelectronic circuits, leading to potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Shen Shen, Yanli Xu, Chao Liu, Wenjing Liu, Jiangtao Liu, Zhenhua Wu
Summary: This research investigates the vibration of graphite driven by a periodic force field formed by terahertz waves interference. It is found that the vibration energy of graphite is five times higher compared to visible light due to the longer wavelength and higher penetration of terahertz waves. Moreover, the motion of graphite exhibits quantization characteristics with separated energy levels. By changing the optical power or magnetic field gradient, graphite can transition between different quantum states.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Yanli Xu, Chuan Zhang, Weimin Li, Rong Li, Jiangtao Liu, Ze Liu, Zhenhua Wu
Summary: An ultraviolet electro-optic modulation system based on graphene-plasmonic metamaterials nanomechanical system (NEMS) with superlubricity has been investigated. The system achieves a high modulation depth and fast response speed due to the strong optical absorption intensity of graphene and the combination of metamaterial structure based on surface plasmons.
