Article
Chemistry, Physical
Laura Kim, Seyoon Kim, Pankaj K. Jha, Victor W. Brar, Harry A. Atwater
Summary: The discovery of a previously unknown hot plasmon emission pathway in graphene has led to Fermi-level-dependent mid-infrared radiation. Experimental evidence shows that this emission process can be significantly brighter than conventional emission mechanisms, pointing towards new possibilities for future research.
Article
Chemistry, Multidisciplinary
Chenchen Wu, Xiangdong Guo, Yu Duan, Wei Lyu, Hai Hu, Debo Hu, Ke Chen, Zhipei Sun, Teng Gao, Xiaoxia Yang, Qing Dai
Summary: In this study, a tunable infrared transparent microfluidic system with graphene plasmons was developed to identify nanoscale proteins. By adjusting the system's transparency, the infrared absorption of water was eliminated, allowing for accurate measurements of the proteins. This study provides a new platform for studying biological processes.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Muhammad Waqas Shabbir, Sayan Chandra, Michael N. Leuenberger
Summary: We present a model of an ultrasensitive mid-IR photodetector made of nanopatterned graphene and vanadium dioxide heterostructure. The photodetector achieves nearly 100% absorption in monolayer graphene using localized surface plasmons around circular holes. It has a short response time and a linear relationship between input power and photocurrent. This mid-IR photodetector has higher sensitivities than traditional detectors while operating at room temperature.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Hai Hu, Na Chen, Hanchao Teng, Renwen Yu, Yunpeng Qu, Jianzhe Sun, Mengfei Xue, Debo Hu, Bin Wu, Chi Li, Jianing Chen, Mengkun Liu, Zhipei Sun, Yunqi Liu, Peining Li, Shanhui Fan, F. Javier Garcia de Abajo, Qing Dai
Summary: In this study, we report a topological transition in the isofrequency dispersion contours of hybrid polaritons supported by a two-dimensional heterostructure consisting of graphene and alpha-phase molybdenum trioxide. By chemically changing the doping level of graphene, we observed a transformation of the topology of polariton isofrequency surfaces. Moreover, when the substrate was changed, the dispersion contour became dominated by flat profiles at the topological transition, thus supporting tunable diffractionless polariton propagation.
NATURE NANOTECHNOLOGY
(2022)
Article
Chemistry, Physical
Ming Zheng, Pengfei Guan, Heliang Fan
Summary: This study investigates the influence of mechanical strain on the magnetic properties of CuFe2O4 films by altering the curvature. It is found that strain can significantly enhance the magnetization and exhibit strain tunable magnetic anisotropy and excellent mechanical antifatigue properties.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
A. T. Costa, Mikhail I. Vasilevskiy, J. Fernandez-Rossier, Nuno M. R. Peres
Summary: This article investigates the challenges of forming hybrid plasmon-magnon polaritons in heterostructures and demonstrates the possibility of polaritons formed by graphene plasmons and magnons in two-dimensional ferromagnetic insulators.
Article
Multidisciplinary Sciences
Angelos Xomalis, Xuezhi Zheng, Rohit Chikkaraddy, Zsuzsanna Koczor-Benda, Ermanno Miele, Edina Rosta, Guy A. E. Vandenbosch, Alejandro Martinez, Jeremy J. Baumberg
Summary: Optomechanical interactions enable coherent interconversion of signals between optical and mechanical domains. Extreme light-matter coupling at nanoscale mode volumes allows single mid-infrared (MIR) photon sensitivity. This study demonstrates frequency upconversion by utilizing infrared absorption and Raman activity of molecular vibrations in plasmonic nanocavities, showing potential for low-cost and large-scale infrared detectors and spectroscopic techniques.
Article
Materials Science, Multidisciplinary
Ming Zheng, Pengfei Guan
Summary: In this study, LSMO thin films were grown on single crystalline mica substrates and the impact of mechanical strain on magnetic properties was investigated. The results show a nonmonotonic dependence of magnetic moment on radius of curvature, which can be attributed to the mechanical bending-triggered lateral tensile strain. Moreover, excellent mechanical antifatigue character was found in the LSMO/mica structures. These flexible LSMO thin films with tunable magnetism and mechanical durability have promising prospect in designing stable flexible spintronic devices and wearable sensors.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yang Wang, Yue Gu, Ailiang Cui, Qing Li, Ting He, Kun Zhang, Zhen Wang, Ziping Li, Zhenhan Zhang, Peisong Wu, Runzhang Xie, Fang Wang, Peng Wang, Chongxin Shan, Hua Li, Zhenhua Ye, Peng Zhou, Weida Hu
Summary: Uncooled infrared photodetectors have drawn attention for their low cost and compact detection systems, but typically have slow response times. This study explores a van der Waals heterojunction on epitaxial HgCdTe for uncooled mid-wavelength infrared photodetection, achieving fast response times and high detectivity.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Jung Sun Ko, Dong Hee Shin, Won Jun Lee, Chan Wook Jang, Sung Kim, Suk-Ho Choi
Summary: This study presents a novel all-two-dimensional vertical-heterostructure photodetector with a balance between performance and comfort, showing promising applications in flexible, foldable, and/or semitransparent electronic/optoelectronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Daniel J. Rizzo, Sara Shabani, Bjarke S. Jessen, Jin Zhang, Alexander S. McLeod, Carmen Rubio-Verdu, Francesco L. Ruta, Matthew Cothrine, Jiaqiang Yan, David G. Mandrus, Stephen E. Nagler, Angel Rubio, James C. Hone, Cory R. Dean, Abhay N. Pasupathy, D. N. Basov
Summary: The researchers successfully created nanometer-scale lateral p-n junctions using graphene/alpha-RuCl3 heterostructure near graphene nanobubbles. Through STM/STS and s-SNOM techniques, they investigated the electronic and optical responses of nanobubble p-n junctions, achieving p-n junctions with a width of around 3 nm and an electric field of approximately 10(8) V/m. The study also utilized ab initio density functional theory calculations to corroborate experimental data and provide insights into charge transfer mechanisms in 2D materials.
Article
Chemistry, Multidisciplinary
Jiayue Han, Fakun Wang, Yue Zhang, Wenjie Deng, Mingjin Dai, Fangchen Hu, Wenduo Chen, Jieyuan Cui, Chaoyi Zhang, Song Zhu, Chongwu Wang, Ming Ye, Song Han, Yu Luo, Tianyou Zhai, Jun Wang, Qi Jie Wang
Summary: Detecting and distinguishing light polarization states is of significant importance in scientific studies and industry applications. In this study, a broadband polarization photodetector with high PRs and wavelength-dependent polarities using a 2D anisotropic/isotropic Nb2GeTe4/MoS2 van der Waals heterostructure is demonstrated, showing effectiveness in polarized communication and imaging.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Da Teng, Yuncheng Wang, Tianzi Xu, Huayu Wang, Qinqin Shao, Yanan Tang
Summary: A symmetric graphene plasmon waveguide (SGPWG) is proposed for excellent subwavelength waveguiding performance of mid-infrared waves, with the ability to achieve a high figure of merit by tuning structural parameters and chemical potential. The waveguide exhibits extremely low crosstalk even at a separation distance of 64 nm.
Article
Optics
Gongli Xiao, Zhixiong Lin, Hongyan Yang, Yanping Xu, Sitong Zhou, Haiou Li, Xingpeng Liu, Peihua Wangyang
Summary: This paper numerically investigates a tunable and anisotropic perfect absorber in a graphene-black phosphorus nanoblock array structure. The suggested structure exhibits polarization-dependent anisotropic absorption in the mid-infrared, and the absorption spectra can be tailored by adjusting the geometrical parameters and doping amounts. The results have the potential in the design of polarization-selective and tunable high-performance devices in the mid-infrared.
Article
Chemistry, Multidisciplinary
Tom Yager, George Chikvaidze, Qin Wang, Ying Fu
Summary: In this study, we combined graphene with asymmetric metal metasurfaces and optimized the geometry-dependent photoresponse for optoelectronic molecular sensor devices. By precise control and characterization, along with simulations, nanofabrication, and spectroscopy, we achieved control over mid-infrared peak response wavelengths, transmittance, and reflectance. Our methods enable simple, reproducible, and targeted mid-infrared molecular sensing over a wide range of geometrical parameters. With its potential for atomic thickness and diverse nanomaterial combinations, these technologies hold high impact potential for environmental monitoring, threat detection, and point of care diagnostics.
Article
Chemistry, Multidisciplinary
Chenchen Wu, Xiangdong Guo, Yu Duan, Wei Lyu, Hai Hu, Debo Hu, Ke Chen, Zhipei Sun, Teng Gao, Xiaoxia Yang, Qing Dai
Summary: In this study, a tunable infrared transparent microfluidic system with graphene plasmons was developed to identify nanoscale proteins. By adjusting the system's transparency, the infrared absorption of water was eliminated, allowing for accurate measurements of the proteins. This study provides a new platform for studying biological processes.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yunpeng Qu, Na Chen, Hanchao Teng, Hai Hu, Jianzhe Sun, Renwen Yu, Debo Hu, Mengfei Xue, Chi Li, Bin Wu, Jianing Chen, Zhipei Sun, Mengkun Liu, Yunqi Liu, F. Javier Garcia de Abajo, Qing Dai
Summary: A tunable planar focusing device operating in the mid-IR region is reported by exploiting highly oriented in-plane hyperbolic phonon polaritons in alpha-MoO3. The device allows for unprecedented control of the effective focal length of polariton waves through the dimension of the device, the employed light frequency, and engineering of phonon-plasmon hybridization.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xiangdong Guo, Ning Li, Chenchen Wu, Xiaokang Dai, Ruishi Qi, Tianyu Qiao, Tuoyi Su, Dandan Lei, Nishuang Liu, Jinlong Du, Enge Wang, Xiaoxia Yang, Peng Gao, Qing Dai
Summary: Metallic MXene micro/nanostructures with plasmon resonances can enhance the electromagnetic absorption. By controlling the interlayer distance and layer number, the desired electromagnetic absorption can be achieved at a specific frequency. These findings provide guidance for the design of advanced ultrathin electromagnetic absorption materials.
ADVANCED MATERIALS
(2022)
Article
Physics, Applied
Debo Hu, Cheng Luo, Lixing Kang, Mengkun Liu, Qing Dai
Summary: This study focuses on the characteristics of surface phonon polaritons (SPhPs) in van der Waals (vdW) materials at low temperatures. By using few-layer hexagonal boron nitride as a mechanically tough and optically passive cladding layer, the surface stability of the materials is enhanced. The validity of this surface reinforcement strategy is demonstrated through probing the temperature dependence of SPhPs.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Jia-Jun Ma, Zhen-Yu Wang, Shui-Gang Xu, Yu-Xiang Gao, Yu-Yang Zhang, Qing Dai, Xiao Lin, Shi-Xuan Du, Jindong Ren, Hong-Jun Gao
Summary: In this study, strain-modulated electronic structures of marginally twisted bilayer graphene were realized through experimental and theoretical calculations. Experimental data showed four peaks near the AA regions, while theoretical calculations suggested that two of these peaks may originate from intrinsic heterostrain. Additionally, Moire patterns with different strain strengths exhibited distinct features of helical edge states.
CHINESE PHYSICS LETTERS
(2022)
Article
Thermodynamics
Bei Yang, Deng Pan, Xiangdong Guo, Hai Hu, Qing Dai
Summary: This study reexamines the near-field radiative heat transfer between biplanar graphene/hBN heterostructures and investigates the influence of different substrates on this transfer process. The results show that substrates significantly impact the heat transfer, depending on the competition between polaritonic couplings and dielectric losses. Additionally, the substrate effects are dependent on the thickness of hBN.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Yifei Li, Xiaowei Zhang, Jinhuan Wang, Xiaoli Ma, Jin-An Shi, Xiangdong Guo, Yonggang Zuo, Ruijie Li, Hao Hong, Ning Li, Kai Xu, Xinyu Huang, Huifeng Tian, Ying Yang, Zhixin Yao, PeiChi Liao, Xiao Li, Junjie Guo, Yuang Huang, Peng Gao, Lifen Wang, Xiaoxia Yang, Qing Dai, EnGe Wang, Kaihui Liu, Wu Zhou, Xiaohui Yu, Liangbo Liang, Ying Jiang, Xin-Zheng Li, Lei Liu
Summary: In WS2/BN heterostructures, the interlayer electron-phonon coupling has been efficiently engineered through various methods such as isotope enrichments, temperature, and high-pressure tuning. The findings provide new opportunities for controlling interlayer coupling in van der Waals heterostructures.
Article
Multidisciplinary Sciences
Hai Hu, Renwen Yu, Hanchao Teng, Debo Hu, Na Chen, Yunpeng Qu, Xiaoxia Yang, Xinzhong Chen, A. S. McLeod, Pablo Alonso-Gonzalez, Xiangdong Guo, Chi Li, Ziheng Yao, Zhenjun Li, Jianing Chen, Zhipei Sun, Mengkun Liu, F. Javier Garcia de Abajo, Qing Dai
Summary: By visualizing plasmons in suspended graphene, we demonstrate the high-quality factor and long propagation length of graphene plasmons at room temperature. The height of the suspended graphene can be used as a tuning knob to control the plasmon wavelength and propagation length, enabling nanoscale energy flow modulation. This research opens up broad horizons for the application of suspended graphene plasmons in nano-photonic devices.
NATURE COMMUNICATIONS
(2022)
Review
Chemistry, Multidisciplinary
Xiangdong Guo, Wei Lyu, Tinghan Chen, Yang Luo, Chenchen Wu, Bei Yang, Zhipei Sun, F. Javier Garcia de Abajo, Xiaoxia Yang, Qing Dai
Summary: 2D monolayers can be vertically stacked in van der Waals heterostructures to support a wide range of confined polaritons. This offers advantages in terms of controlling the constituent layers, stacking sequence, and twist angles. These heterostructures have extended the performance and functions of polaritons, and potential applications include nanophotonic integrated circuits.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Aiwei Wang, Jiuzhou Zhao, Ke Chen, Zhenjun Li, Chi Li, Qing Dai
Summary: A single-electron emitter is developed based on a quantized energy level, which offers high temporal and spatial coherence, as well as a large emission current, ideal for atomic-resolution electron probes. By utilizing carbon nanotubes (CNTs) as the emitter, a current of up to 1.5 nA is achieved, thanks to the double barrier structure with a smaller barrier width. The emitter demonstrates high temporal coherence (energy dispersion around 10 meV) and spatial coherence (effective source radius approximately 0.85 nm), providing a highly coherent electron source for simplifying electron optics systems in atomic-resolution electron microscopy and sub-10 nm electron beam lithography.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Xiangdong Guo, Ning Li, Xiaoxia Yang, Ruishi Qi, Chenchen Wu, Ruochen Shi, Yuehui Li, Yang Huang, F. Javier Garcia de Abajo, En-Ge Wang, Peng Gao, Qing Dai
Summary: Light confinement in nanostructures allows for enhanced light-matter interaction, leading to a wide range of applications. Hexagonal BN nanotubes act as smooth nanocavities that can sustain whispering-gallery modes, with low scattering losses. These nanotubes could potentially enable compact photonic devices with ultrastrong light-matter interactions.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Chunying Chen, Huige Zhou, Yanhong Ma, Qing Dai, Zhiyong Tang
Summary: Established in 2003, the National Center for Nanoscience and Technology (NCNST) is China's leading institution in nanoscience and technology. With state-of-the-art equipment and a strong research team, NCNST conducts cutting-edge research and innovation in various areas, including nanosystems and hierarchical fabrication, biological effects and safety of nanomaterials, standardization and measurements for nanotechnology, and theoretical simulations. NCNST aims to foster international cooperation, cultivate young talents, and drive inspiring innovation.
Article
Materials Science, Multidisciplinary
Bei Yang, Deng Pan, Qing Dai
Summary: This study introduces a novel approach using materials that support phonon polaritons (PhPs) as light-controllable heat sources for photothermal applications. Theoretical demonstration shows that hexagonal boron nitride (hBN) nanorods can generate up to 46 times more heat compared to plasmonic gold counterparts under resonant monochromatic light. This superior heating capability is attributed to the unique properties of PhPs, which enable stronger field confinement and deeper penetration within the nanostructure, leading to higher efficiency by circumventing the electrostatic shielding effect associated with plasmonic heating.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Bei Yang, Qing Dai
Summary: Near-field radiative thermal rectifiers hold promise for various applications, but current designs are limited by mismatch in dielectric properties. This study proposes a novel heterostructure design to achieve stable heat transfer channels and high heat flux contrasts, paving the way for higher thermal rectification factors.
