Article
Chemistry, Multidisciplinary
Zhen Yu Zhang, Guo Ping Wang
Summary: Time-domain study of coherent acoustic phonons in nanomaterials provides dynamic and unparalleled insight into their mechanical and structural features. The acoustic breathing mode of resonant coherent phonons (RCP) in nanoscale RP perovskite films is reported, which shows that RCP oscillation can be used as a novel and non-destructive approach for quantitatively evaluating the decomposition of moisture-exposed RP perovskite. These results reveal the decisive effect of structural geometry on acoustic performances in perovskite nanomaterials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Mamoru Endo, Shota Kimura, Shuntaro Tani, Yohei Kobayashi
Summary: Researchers have developed a new technique to control the effective interaction strength of acoustic phonons by manipulating the time structure of light instead of the material structure. By adjusting the optical pulse train, excitation and coherent control of acoustic phonons in a single-mode fiber can be achieved.
COMMUNICATIONS PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Alexey O. Mikhin, Viktoriia Rutckaia, Roman S. Savelev, Ivan S. Sinev, Andrea Alu, Maxim A. Gorlach
Summary: Topological photonics utilizes global symmetries of the system to enhance the stability of light localization and propagation. In addition to traditional lattice symmetries, an alternative strategy based on accidentally degenerate modes of individual meta-atoms exists. In this study, we experimentally realize a topological edge state in an array of silicon nanostructured waveguides, each having a pair of degenerate modes at telecom wavelengths. By exploiting the hybrid nature of the topological mode, we demonstrate coherent control through the adjustment of phase between the degenerate modes, selectively exciting bulk or edge states. Third harmonic generation imaging confirms the localization of topological modes as a function of relative phase excitations. The engineered accidental degeneracies in our study highlight their impact on the formation of topological phases, expanding the possibilities in topological nanophotonic systems.
Article
Chemistry, Multidisciplinary
Shuomin Zhong, Xuchen Wang, Sergei A. A. Tretyakov
Summary: Conventional coherent absorption occurs only when two incident beams exhibit mirror symmetry. This study proposes a more general metasurface paradigm for coherent perfect absorption with impinging waves from arbitrary asymmetric directions. It shows theoretically and confirms experimentally that the relative amplitude of the reflected wave can be continuously tuned by changing the phase difference between the two beams, opening up promising possibilities for wave manipulation with applications in various fields.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Cameron B. Lennox, Tristan H. Borchers, Lori Gonnet, Christopher J. Barrett, Stefan G. Koenig, Karthik Nagapudi, Tomislav Friscic
Summary: We used a metal surface to directly catalyse copper-catalysed alkyne-azide click-coupling (CuAAC) reactions under the conditions of Resonant Acoustic Mixing (RAM). This mechanochemical methodology eliminates the need for bulk solvent and milling media by relying on high-speed mixing of reagents against a metal surface. The RAM-based direct mechanocatalysis enables the one-pot, two-step synthesis of triazoles on a wide scope of reagents with superior reaction stoichiometry and has been applied for the gram-scale synthesis of the anticonvulsant drug Rufinamide.
Article
Physics, Multidisciplinary
Xuefeng Jiang, Shixiong Yin, Huanan Li, Jiamin Quan, Heedong Goh, Michele Cotrufo, Julius Kullig, Jan Wiersig, Andrea Alu
Summary: Non-Hermitian wave engineering has attracted significant interest in photonics, and reflectionless scattering modes are an important aspect of this field. However, observing these modes in complex photonic platforms has been challenging. In this study, we demonstrate the presence of reflectionless scattering modes in a chaotic photonic microcavity. By modeling the optical fields, we are able to achieve dynamic control over light radiation.
Article
Automation & Control Systems
Wei Han, Kwok Tong Chau, Zhichao Hua, Hongliang Pang
Summary: This article introduces an integrated wireless motor system using laminated magnetic coupler (LMC) and commutative-resonant control (CRC). The system allows for flexible transfer distance, high efficiency, and maintenance-free operation.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Nishant Singh, Guy Torfs, Joris Van Kerrebrouck, Christophe Caillaud, Piet Demeester, Xin Yin
Summary: The proposed analog radio-over-fiber photoreceiver based on a resonant narrowband transimpedance low noise amplifier (TILNA) is designed for low-cost and low-power remote radio heads in the unlicensed 60GHz band. This photoreceiver offers improved gain with resonant matching and has shown success in achieving high-speed data transmission over standard single-mode fiber.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Lori Gonnet, Cameron B. Lennox, Jean-Louis Do, Ivani Malvestiti, Stefan G. Koenig, Karthik Nagapudi, Tomislav Friscic
Summary: Resonant Acoustic Mixing (RAM) is a fast and operationally simple catalytic organic synthesis method that does not require bulk solvent or milling media. It allows for direct scaling up of reactions without significant changes in reaction conditions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Analytical
Liyun Wu, Yongqiu Zheng, Chenyang Xue, Jiandong Bai, Jiamin Chen
Summary: The article describes and tests an optical acoustic detection system based on Fabry Perot Etalon with high quality-factor and stability structure. The FPE contains high-reflectivity lenses for high finesse and stability, with a protective structure to shield from environmental effects. The system detects acoustic signals by inducing vibrations in the cavity medium, resulting in changes in optical path and interference spectrum. Laser frequency locking using phase modulation technology enables detection of various frequency and amplitude acoustic signals.
Article
Acoustics
B. G. Yuan, J. Y. Liu, C. Liu, Y. Cheng, X. J. Liu
Summary: The study presented an acoustic metamaterial (AM) metalens with anisotropic refractive index cavities based on space-coiling units for subwavelength imaging. Compared to traditional Fabry-Perot (FP) resonance, the proposed space-coiling units reduced the thickness of the AM metalens significantly. A resonant tunneling compression effect in the cavities enhanced the resolution of imaging objects located far from the input surface.
Article
Chemistry, Multidisciplinary
Anulekha De, Justine Lynn Drobitch, Sudip Majumder, Saswati Barman, Supriyo Bandyopadhyay, Anjan Barman
Summary: Through the use of time-resolved magneto-optical Kerr effect (TR-MOKE) microscopy, a study demonstrated the amplification of intrinsic spin-wave (SW) modes and the generation of new extrinsic or driven modes in a densely packed two-dimensional array of elliptical Co nanomagnets fabricated on a piezoelectric LiNbO3 substrate induced by surface-acoustic-wave (SAW). The magnetoelastic coupling led to a variety of SW phenomena, with amplification of intrinsic modes and generation of new extrinsic modes observed when the SAW was launched along the major axis, while a dominant driven mode appeared when the SAW was launched along the minor axis.
Article
Physics, Applied
Ze-qi Cheng, An Chen, Jing Yang, Bin Liang, Jian-chun Cheng
Summary: This study presents a broad-band, achromatic acoustic vortex generator based on metamaterials, which has great significance in acoustic communication, particle manipulation, and other applications. The proposed design, integrated-resonant meta-atoms, allows for a constant phase difference between adjacent units and demonstrates high transmission efficiency. The proposed generator successfully converts plane waves into high purity vortex beams across a broad frequency range. The results of numerical simulations and experiments show good agreement, verifying the effectiveness of the proposed design. Compared to traditional acoustic vortex generators, this broadband achromatic acoustic vortex generator exhibits superior performance in terms of vortex purity and conversion properties. This study advances the capability of designing versatile acoustic vortex beams.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Kenny L. S. Yip, Sajeev John
Summary: Locally resonant acoustic materials are proposed for sound control by using resonant oscillators consisting of heavy mass within a light shell embedded in foam. The effective, frequency-dependent mass densities of these oscillators are derived and used to evaluate the acoustic band structure in two dimensions. The accuracy of the results is validated by comparing with exact solutions obtained through numerical simulations.
Article
Physics, Applied
Mahmut Bicer, Stefano Valle, Jacob Brown, Martin Kuball, Krishna C. Balram
Summary: Efficient guidance of high-frequency sound in on-chip waveguides is achieved by strong transverse confinement and low-loss routing. The strong velocity contrast available in GaN on SiC platform is exploited for guiding high-frequency sound in mu m-scale GaN waveguides and ring resonators.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Yuxia Feng, Huarui Sun, Xuelin Yang, Kang Liu, Jie Zhang, Jianfei Shen, Danshuo Liu, Zidong Cai, Fujun Xu, Ning Tang, Tongjun Yu, Xinqiang Wang, Weikun Ge, Bo Shen
Summary: High-quality GaN films on SiC with low thermal boundary resistance are achieved by using an ultrathin low Al content AlGaN buffer layer, which improves crystal quality and reduces thermal boundary resistance simultaneously. Enhanced lateral growth rate contributes to the formation of basal plane stacking faults in GaN, significantly reducing threading dislocation density. The mechanisms of reducing thermal boundary resistance and dislocation density by the ultrathin buffer layer are revealed, showing importance for performance improvement and cost reduction of higher power GaN-on-SiC electronics.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Meng Zhang, Bo Zou, Xu Zhang, Yan Zhou, Huarui Sun
Summary: The study reveals that the thermal conductivity of polycrystalline SnS2 film is lower, approximately half that of single-crystalline SnS2 film, mainly due to phonon scattering at grain boundaries. Two simulation approaches suggest that thermal transport across crystal grains leads to the reduction of thermal conductivity, therefore, the thermal conductivity of polycrystalline SnS2 film can be substantially reduced by tuning the grain size.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Mingqiang Liu, Shuo Yang, Mao Han, Simin Feng, Gui-Gen Wang, Leyang Dang, Bo Zou, Yawei Cai, Huarui Sun, Jie Yu, Jie-Cai Han, Zheng Liu
Summary: The controlled growth of large-sized GaTe with high quality, chemical uniformity, and good reproducibility is achieved through liquid-metal-assisted chemical vapor deposition method. This method can also be used to synthesize various Ga-based 2D materials and their alloys, showing good universality. Raman spectra suggest that the grown GaTe has a relatively weak van der Waals interaction, and monoclinic GaTe displays highly-anisotropic optical properties.
Article
Chemistry, Multidisciplinary
Shea Sanvordenker, Siddharth Borsadia, Steve Morris, Nair Rodriguez-Hornedo, Max Shtein
Summary: This study reports a novel process for the sublimation, transportation, and high-velocity directed deposition of pharmaceutical cocrystals, resulting in the formation of nano- and microscopic cocrystals. This touch-free, nonmechanical, single-step method enables particle size reduction and surface coating of cocrystals.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Physical
Bo Zou, Yu Zhou, Yan Zhou, Yanyan Wu, Yang He, Xiaonan Wang, Jinfeng Yang, Lianghui Zhang, Yuxiang Chen, Shi Zhou, Huaixin Guo, Huarui Sun
Summary: The emerging Au-assisted exfoliation technique enables the production of large-area and high-quality ultrathin 2D crystals. A simple and accurate optical method has been developed to determine the layer number of Au-assisted exfoliated MoS2 and WS2 films.
Article
Crystallography
Shi Zhou, Shun Wan, Bo Zou, Yanping Yang, Huarui Sun, Yan Zhou, Jianbo Liang
Summary: Thinning the buffer layer between GaN and Si substrate is desired for GaN-on-Si devices. Surface activated bonding (SAB) was used to directly bond GaN-on-Si heterostructures at room temperature. The effects of thermal annealing on residual stress and interfacial microstructure were investigated. It was found that a significant relaxation and uniform stress distribution was achieved in SAB bonded GaN-on-Si heterostructures, but the residual stresses evolved differently with increasing annealing temperature.
Article
Automation & Control Systems
Md Ferdous Alam, Max Shtein, Kira Barton, David Hoelzle
Summary: This paper proposes a reinforcement learning enabled physical autonomous manufacturing system that can autonomously fabricate complex-geometry artifacts by learning manufacturing process parameters. To improve sample efficiency, the authors use first-principles based source task for training, transfer effective representations, and learn a probabilistic model of the target reward function. The effectiveness of the method is demonstrated through experiments on a custom AMS machine.
IEEE CONTROL SYSTEMS LETTERS
(2023)
Correction
Chemistry, Multidisciplinary
Shea Sanvordenker, Siddharth Borsadia, Steve Morris, Nair Rodriguez-Hornedo, Max Shtein
CRYSTAL GROWTH & DESIGN
(2023)
Article
Engineering, Electrical & Electronic
Liping Zhang, Shibin Zhang, Jinbo Wu, Pengcheng Zheng, Hongyan Zhou, Hulin Yao, Zhongxu Li, Kai Huang, Huarui Sun, Xin Ou
Summary: This article introduces the high-performance shear horizontal surface acoustic wave (SH-SAW) and longitudinal leaky SAW (LL-SAW) devices using Lithium Tantalate (LiTaO3) thin films on silicon carbide (SiC) substrate. The demonstrated LTOSiC hetero-substrate achieved exciting results on device frequency, quality factor (Q), temperature coefficient of frequency (TCF), and thermal transport properties. The resonators show scalable resonances and the filters exhibit desirable center frequencies, insertion loss, and out-of-band rejection. Overall, LTOSiC serves as an advanced material platform for acoustic devices in the 5G-frequency range 1 (5G-FR1) bands.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Chemistry, Physical
Yaya Wang, Yunzhou Wen, Yumeng Cheng, Xinhong Chen, Mengjiao Zhuansun, Tongbao Wang, Jun Li, Debora Meira, Huarui Sun, Jun Wei, Jia Zhou, Yuhang Wang, Sisi He
Summary: The development of a Ru5Mo4Ox binary oxide catalyst as a replacement for expensive iridium-based catalysts in acidic oxygen evolution reaction (OER) has shown high activity and stability, resulting in a reduction in the cost of green hydrogen production.
Article
Chemistry, Physical
Jinfeng Yang, Zhaoyu Yang, Xiaonan Wang, Yuxiang Chen, Yongze Xu, Bo Zou, Yuli Yan, Huarui Sun
Summary: In this study, Zintl-phase TiNiSi-type SrMgSi and CaMgGe with low intrinsic lattice thermal conductivity were investigated for thermoelectric applications. The low thermal conductivity is attributed to the strong lattice anharmonicity and optical-acoustic phonon coupling, while the high band degeneracy leads to good electrical properties. The predicted ZT values for SrMgSi and CaMgGe were 2.83 and 3.09, respectively.
ACS APPLIED ENERGY MATERIALS
(2023)
Correction
Chemistry, Multidisciplinary
Shea Sanvordenker, Siddharth Borsadia, Steve Morris, Nair Rodriguez-Hornedo, Max Shtein
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Jin Ke, Penghua Ying, Yao Du, Bo Zou, Huarui Sun, Jin Zhang
Summary: This study investigates the mechanical properties of the multilayer MoS2/SiO2 system through experiments and simulations and compares them with the graphene/SiO2 system. It is found that the MoS2/SiO2 and graphene/SiO2 systems have comparable Young's modulus and hardness values, but exhibit different mechanical responses and failure modes under indentation. The MoS2/SiO2 system shows interface delamination failure, while the graphene/SiO2 system does not. This difference can be attributed to the different bending stiffness values between MoS2 and graphene.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Wenhui Xu, Tiangui You, Yibo Wang, Zhenghao Shen, Kang Liu, Lianghui Zhang, Huarui Sun, Ruijie Qian, Zhenghua An, Fengwen Mu, Tadatomo Suga, Genquan Han, Xin Ou, Yue Hao, Xi Wang
Summary: β-Ga2O3 is a promising semiconductor for high power electronic devices due to its ultra-wide bandgap and large figure of merit, but its thermal conductivity is lower than other wide bandgap semiconductors, leading to self-heating issues. By integrating β-Ga2O3 thin films on a highly thermally conductive SiC substrate, thermal performance can be effectively improved, reducing the effective thermal boundary resistance.
FUNDAMENTAL RESEARCH
(2021)
Article
Chemistry, Physical
Bo Zou, Yadong Wei, Yan Zhou, Dingning Ke, Xu Zhang, Meng Zhang, Cho-Tung Yip, Xiaobin Chen, Weiqi Li, Huarui Sun
Summary: By conducting systematic ARPRS measurements, the degree of anisotropy in the response of black phosphorous evolves gradually and periodically with thickness, leading to intricate response. Crystal orientations of BP can be distinguished using Raman peak intensity ratio, where external anisotropic interference effect and intrinsic electron-phonon coupling play crucial roles in the observations.
NANOSCALE HORIZONS
(2021)
