Article
Chemistry, Multidisciplinary
Yves Auad, Cyrille Hamon, Marcel Tence, Hugo Lourenco-Martins, Vahagn Mkhitaryan, Odile Stephan, F. Javier Garcia de Abajo, Luiz H. G. Tizei, Mathieu Kociak
Summary: Whispering-gallery mode resonators contain multiple trapped narrow-band circulating optical resonances, with potential applications in quantum electrodynamics, optomechanics, and sensing. Despite the challenges posed by the spherical symmetry and low field leakage of dielectric microspheres, the interaction between whispering-gallery modes and metallic nanoparticles can effectively excite high-quality cavity modes with the potential for optical sensing and light manipulation.
Article
Nanoscience & Nanotechnology
Kenan Elibol, Clive Downing, Richard G. Hobbs
Summary: In this work, the fabrication and spectroscopic characterization of subwavelength aluminum nanocavities on suspended SiN x membranes are reported. The volume plasmon (VP) and localized surface plasmon resonance (LSPR) modes of these cavities are revealed and studied using electron energy-loss spectroscopy (EELS) and electromagnetic simulations. Dipolar LSPR modes resonant in the UV and blue regions as well as higher-energy optically dark quadrupolar and hexapolar LSPR modes are observed. The asymmetries in the fabricated nanocavities result in a mode mixing and a shift in dipolar dark LSPR modes.
Review
Chemistry, Multidisciplinary
Ora Bitton, Gilad Haran
Summary: This paper discusses the interaction between emitters and plasmonic cavities (PCs), focusing on the strong-coupling (SC) regime. The phenomenon of vacuum Rabi splitting (VRS), where the excited state of an emitter hybridizes with that of the PC, is observed. Experimental work on quantum dots (QDs) and plasmonic silver bowtie cavities is discussed. The paper also explores the potential applications of these systems, such as single-photon sources and cavity-induced coherent interactions between emitters.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Physics, Multidisciplinary
Zhao Shi-Hang, Zhang Yuan, Lu Si-Yuan, Cheng Shao-Bo, Zheng Chang-Lin, Wang Lu-Xia
Summary: This study focused on the strong coupling phenomenon between surface plasmons and quantum emitters using electron energy loss spectroscopy (EELS). The energy and mode characteristics of surface plasmons on silver nanorods and the excitation characteristics of dielectric materials were obtained through theoretical simulations. Rabi splitting of spectral peaks was observed and the effect of nanorod size on Rabi splitting was explored. The study also discussed the strong coupling between dielectric materials and radiative/non-radiative plasmons and investigated plexciton phenomena from the perspective of loss spectrum imaging.
ACTA PHYSICA SINICA
(2022)
Article
Chemistry, Physical
Alice Apponi, Domenica Convertino, Neeraj Mishra, Camilla Coletti, Mauro Iodice, Franco Frasconi, Federico Pilo, Narcis Silviu Blaj, Daniele Paoloni, Ilaria Rago, Giovanni De Bellis, Gianluca Cavoto, Alessandro Ruocco
Summary: In this study, accurate transmission measurements of electrons below 1 keV through suspended monolayer graphene were reported. The monolayer graphene was grown using chemical vapor deposition and transferred onto transmission electron microscopy (TEM) grids. The transparency of graphene was obtained by measuring the direct beam current and transmitted current. The experimental results showed a transmission rate ranging from about 20% to about 80% for monolayer graphene within the experimental electron energy range. The high quality and grid coverage of the suspended graphene were confirmed through various characterization techniques. Additionally, evidence of suspended monolayer graphene was observed after annealing the samples in vacuum at 550 degrees C.
Article
Chemistry, Physical
Agust Olafsson, Siamak Khorasani, Jacob A. Busche, Jose J. Araujo, Juan Carlos Idrobo, Daniel R. Gamelin, David J. Masiello, Jon P. Camden
Summary: This study investigates the performance of carrier-doped semiconductor nanocrystals in the infrared spectrum, revealing that ITO NCs may have greater coupling strength than expected, with the potential for near-field enhancement and resonant energy transfer.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Multidisciplinary Sciences
Sandhya Susarla, Pablo Garcia-Fernandez, Colin Ophus, Sujit Das, Pablo Aguado-Puente, Margaret McCarter, Peter Ercius, Lane W. Martin, Ramamoorthy Ramesh, Javier Junquera
Summary: This research utilizes a combination of techniques to probe the electronic structure within polar vortices in oxide superlattices at the atomic scale, finding that the peaks in Ti L-edge spectra systematically shift depending on the position of the Ti4+ cations. First-principles computations and simulations derived from first principles show good agreement with experimental results.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Xiaoyan Li, Georg Haberfehlner, Ulrich Hohenester, Odile Stephan, Gerald Kothleitner, Mathieu Kociak
Summary: Surface phonon polaritons (SPhPs) are coupled photon-phonon excitations that strongly influence the optical and thermal behavior of nanomaterials. By using a scanning transmission electron microscope with a highly monochromated electron beam, varying SPhP signatures from nanoscale MgO cubes can be visualized and used to tomographically reconstruct the phononic surface electromagnetic fields of the object. This 3D information offers insights into nanoscale physical phenomena and is valuable for the design and optimization of nanostructures for new uses.
Article
Nanoscience & Nanotechnology
Michal Horak, Andrea Konecna, Tomas Sikola, Vlastimil Krapek
Summary: Electron energy loss spectroscopy (EELS) is commonly used to study localized surface plasmon modes of plasmonic antennas, but it has limited spectral resolution and difficulty in resolving closely spaced modes. In this study, we address this issue by analyzing the plasmon modes of a dimer plasmonic antenna composed of two gold discs. We propose metrics based on spectral and spatial sensitivity to resolve the modes and validate them through electrodynamic simulations. Experimental data demonstrate the capability of these metrics to resolve and identify the modes, except for the transverse bonding and antibonding modes. Overall, the spatio-spectral metrics enhance the information extracted from EELS for plasmonic antennas.
Article
Chemistry, Analytical
Attila Bonyar
Summary: By simulating coupled plasmonic nanosphere and nano-ellipsoid dimers in LSPR biosensors, the optimization of nanoparticle arrangements can enhance sensor sensitivity. Results show that adjusting interparticle gaps and dielectric layer thickness can enhance plasmonic response range and surface sensitivity, resulting in a higher response to molecular interactions.
Article
Chemistry, Physical
S. van Vliet, A. Troglia, E. Olsson, R. Bliem
Summary: This study combines XPS, grazing-incidence X-ray diffraction, and density functional theory calculations to demonstrate that plasmon excitation energies in transition metal silicides can reflect changes in electronic structure upon formation. By observing shifts in electron energy loss satellites, even basic experimental equipment can be used to study electron structure differences in silicides, making this approach promising for enhancing the chemical sensitivity of surface spectroscopy methods.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Claire Goldmann, Xiaoyan Li, Mathieu Kociak, Doru Constantin, Cyrille Hamon
Summary: Silver nanorods with tunable width were prepared by a two-step growth process, where the length was controlled by the overgrowth on the {111} facets and the width was adjusted by the overgrowth on the {100} facets in the presence of dimethyl sulfoxide. The method allows tuning the plasmon energies and the ratio of scattering and absorption contributions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Review
Chemistry, Multidisciplinary
Kellie Jenkinson, Luis M. Liz-Marzan, Sara Bals
Summary: Electron tomography is an important technique for visualizing nanoparticle morphology. This article summarizes the experimental and computational development of various multimode tomography techniques and their role in overcoming materials science challenges. Current challenges and future directions of multimode tomography are also discussed.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xuewen Fu, Zepeng Sun, Shaozheng Ji, Fang Liu, Min Feng, Byung-Kuk Yoo, Yimei Zhu
Summary: In this study, surface plasmons on a silver film were excited using a femtosecond laser, and the subsequent transient dynamics were investigated using photon-induced near-field electron microscopy (PINEM). The results showed that unlike silver nanowires and nanorods, the PINEM intensity on the silver film did not show any polarization dependence, providing a simple method for identifying the time zero in 4D ultrafast electron microscopy (UEM).
Article
Chemistry, Inorganic & Nuclear
Akhil Kumar Singh, Mohammad Usman, Sabyasachi Sarkar, Giuseppe Sciortino, Devesh Kumar, Eugenio Garribba, Sankar Prasad Rath
Summary: Three different oxidovanadium(IV) porphyrin dimers were synthesized with different spatial arrangements of the two rings by changing the bridge between the porphyrin macrocycles. The electronic and magnetic properties of these dimers were characterized using various analytical techniques, revealing unusual ferromagnetic interactions between the vanadium(IV) and porphyrin pi-cation radicals.
INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Li Liu, Jian-Tang Jiang, Xiang-Yuan Cui, Bo Zhang, Liang Zhen, Simon P. Ringer
Summary: The study investigates the correlation between precipitates evolution and mechanical properties of Al-Sc-Zr alloy with Er additions during isothermal ageing. Results show that Er additions significantly improve hardness by increasing the nucleation rate of Al-3(Er,Sc,Zr) precipitates, leading to a higher density of fine nanoparticles. First-principles calculations demonstrate energetically favored solute-solute interactions, rationalizing the observed precipitate structure and formation mechanism.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Microscopy
A. J. Breen, A. C. Day, B. Lim, W. J. Davids, S. P. Ringer
Summary: In this study, a method was developed to enhance the contrast of poles and zone lines in atom probe data by plotting crystallographically correlated metrics. This method can be applied to a wide range of crystalline datasets where crystallographic information is not readily apparent from existing methods, and it helps to gain a deeper understanding of field evaporation behavior during atom probe experiments.
Article
Chemistry, Multidisciplinary
Ruxin Liu, Liang Si, Wei Niu, Xu Zhang, Zhongqiang Chen, Changzheng Zhu, Wenzhuo Zhuang, Yongda Chen, Liqi Zhou, Chunchen Zhang, Peng Wang, Fengqi Song, Lin Tang, Yongbing Xu, Zhicheng Zhong, Rong Zhang, Xuefeng Wang
Summary: Through UV-light irradiation, a photocarrier-doping-induced Mott-insulator-to-metal phase transition is observed in a few atomic layers of perovskite intermediate-spin ferromagnetic SrRuO3-delta. This new metastable metallic phase can be reversibly regulated by the convenient photocharge transfer from SrTiO3 substrates to SrRuO3-delta ultrathin films.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Zhe Ying, Bo Chen, Chunfeng Li, Boyuan Wei, Zheng Dai, Fengyi Guo, Dengfeng Pan, Haijun Zhang, Di Wu, Xuefeng Wang, Shuai Zhang, Fucong Fei, Fengqi Song
Summary: Building a van der Waals heterostructure can ignite interface magnetic ordering of magnetic topological insulators, which helps to reveal novel quantum states and design functional devices.
Article
Nanoscience & Nanotechnology
Wenxuan Sun, Yequan Chen, Wenzhuo Zhuang, Zhongqiang Chen, Anke Song, Ruxin Liu, Xuefeng Wang
Summary: We report the spin-to-charge conversion (SCC) in Mo0.25W0.75Te2-x (MWT)/Y3Fe5O12 (YIG) heterostructures at room temperature. The amorphous MWT films are deposited on liquid-phase-epitaxial YIG using pulsed laser deposition. The significant SCC voltage with a spin Hall angle of 0.021 is measured in the MWT layer by spin pumping experiments. Control experiments with MgO or Ag layers inserted between MWT and YIG confirm that the SCC is mainly attributed to the inverse spin Hall effect.
Article
Materials Science, Multidisciplinary
Han Lin Mai, Xiang-Yuan Cui, Daniel Scheiber, Lorenz Romaner, Simon P. Ringer
Summary: This study investigates the segregation and co-segregation effects of phosphorus (P) and transition metal (TM) elements at grain boundaries (GBs) in steels. The findings reveal that while P alone is unlikely to cause intergranular fracture, its stronger segregation binding compared to TMs can explain its ubiquitous presence at GBs. The repulsive interactions and strong segregation binding of P deplete cohesion-enhancing solutes at general GBs and favor cohesion-lowering P-TM co-segregation combinations. These mechanisms contribute to P-induced temper embrittlement in alloyed steels and have significant implications for GB engineering.
Article
Materials Science, Multidisciplinary
Zizheng Song, Ranming Niu, Xiangyuan Cui, Elena V. Bobruk, Maxim Yu. Murashkin, Nariman A. Enikeev, Ji Gu, Min Song, Vijay Bhatia, Simon P. Ringer, Ruslan Z. Valiev, Xiaozhou Liao
Summary: Superplastic deformation of polycrystalline materials is usually achieved by diffusion-assisted grain boundary sliding at high temperatures. Recent research has shown that room-temperature superplasticity can be achieved in ultrafine-grained Al-Zn based alloys, but the underlying mechanism is still unclear. This study utilized in-situ tensile straining, electron microscopy characterization, and atomistic density functional theory simulation to reveal that the superplasticity at room temperature is achieved by grain boundary sliding and grain rotation, facilitated by the continuous diffusion of Zn. The diffusion of Zn atoms from grains to grain boundaries forms a Zn nanolayer, acting as a solid lubricant to lower the energy barrier of grain boundary sliding.
Article
Multidisciplinary Sciences
Tingting Song, Zibin Chen, Xiangyuan Cui, Shenglu Lu, Hansheng Chen, Hao Wang, Tony Dong, Bailiang Qin, Kang Cheung Chan, Milan Brandt, Xiaozhou Liao, Simon P. P. Ringer, Ma Qian
Summary: This study demonstrates a series of titanium-oxygen-iron compositions with outstanding tensile properties, achieved through alloy design and additive manufacturing. These alloys, strengthened by the abundant elements of oxygen and iron, offer potential for diverse applications and the industrial-scale use of waste sponge titanium. Additionally, they have significant economic and environmental potential for reducing the carbon footprint of energy-intensive sponge titanium production.
Article
Chemistry, Multidisciplinary
Hongwei Liu, Keita Nomoto, Anna V. Ceguerra, Jamie J. Kruzic, Julie Cairney, Simon P. Ringer
Summary: This study develops a new software tool for calculating Pair distribution function (PDF) from electron diffraction patterns (EDPs). The software tool features accurate background subtraction and automatic conversion of different diffraction intensity profiles into a PDF. The study also evaluates the effects of background subtraction and elliptical distortion on PDF profiles. The EDP2PDF software provides a reliable tool for analyzing the atomic structure of both crystalline and non-crystalline materials.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Chemistry, Multidisciplinary
Xiang Ding, Xiangyuan Cui, Li-Ting Tseng, Yiren Wang, Jiangtao Qu, Zengji Yue, Lina Sang, Wai Tung Lee, Xinwei Guan, Nina Bao, Ci Sathish, Xiaojiang Yu, Shibo Xi, Mark B. H. Breese, Rongkun Zheng, Xiaolin Wang, Lan Wang, Tom Wu, Jun Ding, Ajayan Vinu, Simon P. Ringer, Jiabao Yi
Summary: In this work, Ni/NiO nanocomposites were fabricated by depositing Ni and NiO thin layers alternately and annealing them at specific temperatures. It was found that the samples annealed at 473 K exhibited a significantly enhanced saturation magnetization exceeding 607 emu cm-3 at room temperature, surpassing that of pure Ni (480 emu cm-3). Material characterizations and density functional theory calculations confirmed that the NiO nanoclusters embedded in the Ni matrix were primarily responsible for the high magnetization, as they were ferromagnetically coupled with Ni.
Article
Microscopy
Levi Tegg, Andrew J. Breen, Siyu Huang, Takanori Sato, Simon P. Ringer, Julie M. Cairney
Summary: The CAMECA Invizo 6000 atom probe microscope utilizes unique ion optics, including dual antiparallel deep ultraviolet lasers, a flat counter electrode, and various lenses, to enhance the field-of-view without compromising the mass resolving power. This study demonstrates the performance of the Invizo 6000 through three material case studies, using both air and vacuum-transfer between instruments. The results show that the Invizo 6000 significantly improves the field-of-view compared to a LEAP 4000 X Si and enhances specimen yield, particularly for difficult samples like oxides.
Article
Chemistry, Physical
Haijiao Lu, Nasir Uddin, Zhehao Sun, Zibin Chen, Zackaria Mahfoud, Yilan Wu, Ary Anggara Wibowo, Zhicheng Su, Xinmao Yin, Chi Sin Tang, Xiaozhou Liao, Simon P. Ringer, Xiu Song Zhao, Andrew T. S. Wee, Michel Bosman, Zongyou Yin
Summary: By integrating plasmonic bismuth nanoparticles and non-plasmonic redox heterojunctions, we have successfully achieved high activity and selectivity in the transformation of CO2 into methanol. This is achieved through the use of localized surface plasmon resonances (LSPRs) to direct the reaction pathways and optimize product selectivity.
Article
Engineering, Manufacturing
Bryan Lim, Keita Nomoto, Amy J. Clarke, Sudarsanam Suresh Babu, Sophie Primig, Xiaozhou Liao, Andrew J. Breen, Simon P. Ringer
Summary: Complex geometries and topology optimisations are driving the additive manufacturing of Ni-based superalloys, but there are thermal signature differences in complex components compared to commonly studied test coupons, leading to unaccounted microstructure-property variations. The effects of topological changes, such as engineered internal voids, on the mechanical performance of as-fabricated Haynes 282 monolith are investigated, revealing the influence of changing thermal conditions on the local mechanical property response.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Nana Kwabena Adomako, Nima Haghdadi, James F. L. Dingle, Ernst Kozeschnik, Xiaozhou Liao, Simon P. Ringer, Sophie Primig
Summary: Metal additive manufacturing is an ideal technique for producing complex shaped engineering parts, but advanced control of microstructures and properties through modeling is necessary. This study presents a computational modeling approach to predict and optimize the microstructures and properties during metal additive manufacturing.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Zhiheng Zhang, Hansheng Chen, Jiaying Jin, Bryan Lim, Xiaolian Liu, Wei Li, Mi Yan, Simon P. Ringer
Summary: This study presents a multi-main-phase Nd-Dy-Fe-B magnet with a Dy-lean core-Dy-rich shell microstructure, which exhibits high magnetic performance and thermal stability. The formation mechanism of the core-shell microstructure is explained through experimental and simulation analysis, highlighting the potential application of the magnet in large-scale production.
