Article
Chemistry, Multidisciplinary
Biao Chen, Tianshuai Wang, Shiyong Zhao, Junyang Tan, Naiqin Zhao, San Ping Jiang, Qianfan Zhang, Guangmin Zhou, Hui-Ming Cheng
Summary: In sodium-ion batteries, the iron single-atom catalyst SAFe@NG facilitates the efficient reversible conversion reaction of MoS2, as demonstrated by theoretical simulations and experimental methods. The SAFe@NG catalyst helps in the uniform dispersion of Na2S/Mo and the decomposition of Na2S and NaMoS2, promoting the reaction kinetics of MoS2.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Cheng-Han Huang, Chia-Hung Wu, Rashid G. Bikbaev, Ming-Jyun Ye, Chi-Wen Chen, Tung-Jung Wang, Ivan V. Timofeev, Wei Lee, Kuo-Ping Chen
Summary: In this study, a graphene layer combined with a Tamm plasmon polariton (TPP) is proposed as a wavelength- and angle-selective photodetector. The graphene layer is located at the strong field confinement position, and the photocurrent response is significantly enhanced with increasing absorption. Moreover, the graphene-TPP photodetector has wavelength and angle selectivity, making it applicable in LiDAR detecting, sun sensors, laser beacon tracking, and navigational instruments in the future.
Article
Optics
Federico Roccati, Salvatore Lorenzo, Giuseppe Calajo, G. Massimo Palma, Angelo Carollo, Francesco Ciccarello
Summary: Photon-mediated interaction between quantum emitters is an emerging field in quantum optics. Non-Hermitian physics, particularly in photonic lattices, challenges conventional theories and allows access to new physics. The study reveals that structured losses in the field can lead to exotic emission properties. Photons can mediate dissipative, fully non-reciprocal interactions between emitters, with the range depending on the loss rate.
Article
Materials Science, Multidisciplinary
Andrea Tomadin, Matteo Carrega, Marco Polini
Summary: This study investigates the theory of plasma-wave photodetection in bilayer graphene, demonstrating how quantum capacitance effects can modify the intensity of the photodetection signal. External electrical bias induced by top and bottom gates can be used to control the strength of quantum capacitance corrections and thus the photoresponse.
Article
Nanoscience & Nanotechnology
Ana Kalinic, Ivan Radovic, Lazar Karbunar, Vito Despoja, Zoran L. Miskovic
Summary: The wake potential in a graphene-Al2O3-graphene composite system is influenced by factors including the velocity, distance, layer thickness, plasmon damping rate, and doping density of graphene relative to an external charged particle moving parallel to it. The effects on the wake potential vary for charged particle velocities below and above the threshold for excitations of Dirac plasmon in graphene.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Huicheng Hu, Wenhao Guan, Yafeng Xu, Xuchun Wang, Linzhong Wu, Min Chen, Qixuan Zhong, Yong Xu, Youyong Li, Tsun-Kong Sham, Xiaohong Zhang, Lu Wang, Muhan Cao, Qiao Zhang
Summary: The study demonstrates that Pt single atoms can be successfully deposited on CsPbBr3 NCs through a photoassisted approach, leading to efficient photocatalytic properties. CsPbBr3 nanocrystals can also be used as suitable substrates for anchoring other metal single atoms, expanding their applications in catalysis.
Article
Engineering, Electrical & Electronic
A. M. Lerer, G. S. Makeeva, V. V. Cherepanov
Summary: The study developed a numerical-analytical method for mathematical simulation of nonlinear effects in multilayer plasmonic structures based on nanostructured graphene. It was found that the efficiency of nonlinear interaction in multilayer graphene structures increases significantly by increasing the number of layers and packing density of graphene microribbons, as well as using multilayer substrates. Additionally, a decrease in chemical potential leads to a lower plasmon resonance frequency but increases the amplitude of the generated third harmonic.
JOURNAL OF COMMUNICATIONS TECHNOLOGY AND ELECTRONICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Ambrish Kumar Srivastava
Summary: The study shows that alkali metal atoms adsorbed on the surface of LiG can significantly reduce the energy gap of M@LiG structure, leading to strong charge transfer, increased dipole moment, and polarizabilities. The lowest-energy M@LiG structures exhibit extremely high static hyperpolarizability values.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Dabao Lu, Zhufeng Hou, Huimin Li, Bo Da, Z. J. Ding
Summary: The study demonstrates that even a single hydrogen atom in out-of-plane passivation can significantly impact plasmon excitation, as well as the distribution of induced charge density and hot carriers. This phenomenon is observable even in hexagonal nanographene with a size of 2.0 nm.
APPLIED SURFACE SCIENCE
(2021)
Article
Optics
Zhoutian Liu, Yuan Meng, Zhuorun Zhou, Lue Wang, Tiantian He, Dan Li, Ping Yan, Mali Gong, Qirong Xiao
Summary: This research proposes and validates nanostructured fiber devices that enable high-purity mode conversion between arbitrary fiber modes. These devices have an ultra-wide operation band and can be fabricated for mass production.
Article
Mechanics
Shaoyu Zhao, Yingyan Zhang, Helong Wu, Yihe Zhang, Jie Yang, Sritawat Kitipornchai
Summary: This paper investigates the nonlinear bending behaviors of functionally graded composite beams made of graphene origami-enabled auxetic metal metamaterials. The effects of various factors on the bending performances of the beams are analyzed through model and parametric studies.
COMPOSITE STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Yen-Chu Lu, Julian G. West
Summary: This study demonstrates a novel catalyst system for efficient decarboxylative protonation, replacing carboxylic acid groups with hydrogen or its isotope. The reaction achieves high efficiency and scalability, making it suitable for large-scale applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Biochemistry & Molecular Biology
Leonardo Marusic, Ana Kalinic, Ivan Radovic, Josip Jakovac, Zoran L. Miskovic, Vito Despoja
Summary: Graphene doped by alkali atoms supports two types of intense two-dimensional plasmons, the Dirac plasmon and the acoustic plasmon. The mechanism of their formation in alkali-doped graphenes was not completely understood before. Research shows that different alkali-doped graphenes have different plasmonic spectra.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Chen Wang, Ruoqing Zhao, Wenru Fan, Lei Li, Haoyang Feng, Zexuan Li, Ci Yan, Xiaoyang Shao, Krzysztof Matyjaszewski, Zhenhua Wang
Summary: A facile approach for tribochemically controlled atom transfer radical polymerization (tribo-ATRP) was developed, which relies on contact-electro-catalysis (CEC) between titanium oxide (TiO2) particles and CuBr2/tris(2-pyridylmethylamine (TPMA), without any high-energy input. The friction induced by stirring electrifies the TiO2 particles, continuously reducing CuBr2/TPMA into CuBr/TPMA, thereby initiating ATRP. The design of tribo-ATRP enables CEC to access a variety of polymers with predetermined molecular weights, low dispersity, and high chain-end fidelity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
A. Farnood, M. Ranjbar, A. Azarian, H. Salamati
Summary: In this study, plasmon coupling effect was utilized for sensing hydrogen gas. Nanostructured thin Au films were deposited on quartz substrates and a thin Pd film was deposited on top. The plasmon sensing was achieved by observing the blue shift in LSPR upon hydrogen exposure.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(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
Theis P. P. Rasmussen, A. Rodriguez Echarri, F. Javier Garcia de Abajo, Joel D. D. Cox
Summary: The subwavelength plasmonic near-field enhancement is hindered by large ohmic losses in good plasmonic materials, while conventional phase-matching of fields in bulk nonlinear crystals is not suitable for realizing nonlinear optical phenomena on the nanoscale. In contrast, highly-doped graphene supports long-lived, highly-confined, and actively-tunable plasmons, making it an excellent platform for both plasmonics and nonlinear optics. By interfacing multiple graphene nanostructures in close proximity, we can trigger nonlocal effects associated with large gradients in the electromagnetic near field to enhance nonlinear response.
Article
Optics
Xihang Shi, Michael Shentcis, Yaniv Kurman, Liang Jie Wong, F. Javier Garcia de Abajo, Ido Kaminer
Summary: The tunable control of X-ray waves is a critical challenge for applications in X-ray spectroscopy, medical imaging, and radiation therapy. The proposed method of shaping X-ray waves directly at the source using strain on van der Waals materials has the potential to bypass the limits of current X-ray optics technology and enable further developments in high-resolution X-ray science.
Article
Multidisciplinary Sciences
Hai Hu, Na Chen, Hanchao Teng, Renwen Yu, Mengfei Xue, Ke Chen, Yuchuan Xiao, Yunpeng Qu, Debo Hu, Jianing Chen, Zhipei Sun, Peining Li, F. Javier Garcia de Abajo, Qing Dai
Summary: Negative refraction is achieved using hybrid topological polaritons in van der Waals heterostructures, allowing for gate-tunable manipulation of mid-infrared radiation. Wide-angle negatively refracted polaritons are observed in partially decorated a-MoO3 films with graphene, demonstrating reversible nanoscale focusing. This technique offers possibilities for electrically tunable super-resolution imaging, nanoscale thermal manipulation, enhanced molecular sensing, and on-chip optical circuitry.
Article
Optics
Xihang Shi, Yaniv Kurman, Michael Shentcis, Liang Jie Wong, F. Javier Garcia de Abajo, Ido Kaminer
Summary: The science and technology of X-ray optics have made significant progress, allowing for the focusing of X-rays in various applications. However, certain forms of tailoring waves that are common in the optical regime have been challenging to achieve in the X-ray regime. We propose a novel concept of X-ray focusing by inducing a curved wavefront during the X-ray generation process, enabling the creation of nanobeams with precise focal spots. This concept bypasses the limitations of traditional X-ray optical components and allows for tunable parameters of the focused hotspot.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Izzah Machfuudzoh, Tatsuki Hinamoto, F. Javier Garcia de Abajo, Hiroshi Sugimoto, Minoru Fujii, Takumi Sannomiya
Summary: This study fills the research gap in direct imaging of optical modes by demonstrating nanoscale optical-field visualization of self-interference of light extracted from excited modes through experimentally obtained photon maps that directly portray the field distributions of the excited eigenmodes. By selectively choosing specific modes using cathodoluminescence-based scanning transmission electron microscopy with angle-, polarization-, and wavelength-resolved capabilities, the internal field distributions of the whispering-gallery modes reveal the interference between multiple modes and the resulting complex patterns dependent on the detection angle and polarization. The direct visualization of internal fields enables a comprehensive understanding of WGMs and can provide insights for the design of nanophotonic applications.
Article
Nanoscience & Nanotechnology
Andrea Konecna, Enzo Rotunno, Vincenzo Grillo, F. Javier Garcia de Abajo, Giovanni Maria Vanacore
Summary: Single-pixel imaging was developed as a technique for probing with light wavelengths undetectable by conventional multi-pixel detectors. However, the spatial resolution of optics-based single-pixel microscopy is limited to hundreds of nanometers due to diffraction. In this study, we propose using optically modulated electrons in ultrafast electron microscopes to achieve subnanometer spatially and temporally resolved single-pixel imaging. Simulation results show that realistic imperfect illumination patterns can be used to reconstruct the sample image and its temporal evolution. Electron single-pixel imaging holds great potential for low-dose probing of beam-sensitive biological and molecular samples, particularly in rapid screening during in situ experiments.
Article
Nanoscience & Nanotechnology
Alvaro Rodriguez Echarri, Fadil Iyikanat, Sergejs Boroviks, N. Asger Mortensen, Joel D. Cox, F. Javier Garcia de Abajo
Summary: The promising applications of photonics rely on the fabrication of high-quality metal thin films with controlled thickness in the range of a few nanometers. These materials exhibit highly nonlinear response to optical fields due to ultrafast electron dynamics. However, the understanding of this phenomenon on such small length scales is limited. In this study, a new mechanism controlling the nonlinear optical response of thin metallic films is revealed, which is dominated by ultrafast electronic heat transport when the film thickness is sufficiently small. By experimentally and theoretically studying electronic transport in these materials, the researchers explained the observed temporal evolution of photoluminescence in two-pulse correlation measurements. They found that ultrafast thermal dynamics plays a crucial role in determining the strength and time-dependent characteristics of the nonlinear photoluminescence signal. Their findings provide new insights into the nonlinear optical response of nanoscale materials and offer possibilities for controlling and utilizing hot carrier distributions in metallic films.
Article
Multidisciplinary Sciences
John H. Gaida, Hugo Lourenco-Martins, Sergey V. Yalunin, Armin Feist, Murat Sivis, Thorsten Hohage, F. Javier Garcia de Abajo, Claus Ropers
Summary: The paper introduces Lorentz-PINEM for full-field, non-invasive imaging of complex optical near fields at high spatial resolution. The authors use energy-filtered defocus phase-contrast imaging and iterative phase retrieval to reconstruct the phase distribution of interfering surface-bound modes on a plasmonic nanotip. Their approach is applicable for retrieving the spatially varying phase of nanoscale fields and topological modes.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Alejandro Manjavacas, F. Javier Garcia de Abajo
Summary: Single-photon emitters are essential for quantum technologies, but generating single photons along specific directions usually requires complex configurations. In this study, we propose a photon source that can efficiently generate single photons along guided modes. By placing a quantum emitter in a periodically patterned linear waveguide, the emission of photons is preferentially directed along the waveguide in a region close to the period, resulting in a significant reduction in temporal uncertainty. Our research opens up a new approach for producing highly directional single photons with reduced temporal uncertainty.
Article
Chemistry, Multidisciplinary
P. A. D. Goncalves, F. Javier Garcia de Abajo
Summary: This study theoretically demonstrates that core-level photoemission from nanostructures can exhibit spectrally narrow plasmonic features with relatively high probabilities analogous to the direct peak. The morphology and dimensionality of the nanostructures have a dramatic effect on the plasmon-satellite probabilities, and universal scaling laws are found. Additionally, a pump-probe scheme is introduced to explore the ultrafast dynamics of the sampled nanostructure by optically exciting plasmons prior to photoemission.
Article
Physics, Multidisciplinary
Lu Wang, F. Javier Garcia de Abajo, Georgia T. Papadakis
Summary: In this article, the violation of Kirchhoff's law is achieved in pattern-free heterostructures. It is demonstrated that a resonant mode in a dielectric spacer between a nonreciprocal film and a back reflector is sufficient to maximally violate Kirchhoff's law. The minimal dielectric requirements for such functionality are identified and currently available materials satisfy these requirements.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Eduardo J. C. Dias, Ivan Madan, Simone Gargiulo, Francesco Barantani, Michael Yannai, Giovanni Maria Vanacore, Ido Kaminer, Fabrizio Carbone, F. Javier Garcia de Abajo
Summary: We develop a comprehensive microscopic theory to predict the spatiotemporal dynamics of laser-pulse-induced plasmas, and study the characteristics of terahertz fields generated through electron emission, metal screening, and plasma cloud interactions. We also investigate the interaction with femtosecond electron beams and explain recent ultrafast electron microscopy experiments. Our work contributes fundamental insight into the generation and dynamics of micron-scale electron plasmas and their interaction with ultrafast electron pulses.
NANOSCALE ADVANCES
(2023)
