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arXiv 2024年

作者： Han, Jiashu Liu, Kunzan Isaacson, Keith B. Monakhova, Kristina Griffith, Linda G. You, Sixian Research Laboratory of Electronics MIT United States Department of Electrical Engineering and Computer Science MIT United States Newton-Wellesley Hospital Mass General Brigham United States Department of Biological Engineering MIT United States Department of Mechanical Engineering MIT United States

Three-dimensional (3D) subcellular imaging is essential for biomedical research, but the diffraction limit of optical microscopy compromises axial resolution, hindering accurate 3D structural analysis. This challenge is particularly pronounced in label-free imaging of thick, heterogeneous tissues, where assumptions about data distribution (e.g. sparsity, label-specific distribution, and lateral-axial similarity) and system priors (e.g. independent and identically distributed (i.i.d.) noise and linear shift-invariant (LSI) point-spread functions (PSFs)) are often invalid. Here, we introduce SSAI-3D, a weakly physics-informed, domain-shift-resistant framework for robust isotropic 3D imaging. SSAI-3D enables robust axial deblurring by generating a PSF-flexible, noise-resilient, sample-informed training dataset and sparsely fine-tuning a large pre-trained blind deblurring network. SSAI-3D was applied to label-free nonlinear imaging of living organoids, freshly excised human endometrium tissue, and mouse whisker pads, and further validated in publicly available ground-truth-paired experimental datasets of 3D heterogeneous biological tissues with unknown blurring and noise across different microscopy systems. © 2024, CC BY.

关键词： Optical transfer function

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Four-dimensional conserved topological charge vectors in plasmonic quasicrystals

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science (New York, N.Y.) 2025年第6734期387卷 644-648页

作者： Tsesses, Shai Dreher, Pascal Janoschka, David Neuhaus, Alexander Cohen, Kobi Meiler, Tim C. Bucher, Tomer Sapir, Shay Frank, Bettina Davis, Timothy J. Meyer Zu Heringdorf, Frank Giessen, Harald Bartal, Guy rew and Erna Viterbi Department of Electrical and Computer Engineering Technion - Israel Institute of Technology Haifa Israel Department of Physics MIT-Harvard Center for Ultracold Atoms and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA United States Faculty of Physics and Center for Nanointegration University of Duisburg-Essen Duisburg-Essen (CENIDE) Duisburg Germany 4th Physics Institute Research Center SCoPE Integrated Quantum Science and Technology Center University of Stuttgart Stuttgart Germany Centre for Disruptive Photonic Technologies and School of Physical and Mathematical Sciences Nanyang Technological University Singapore Faculty of Mathematics and Computer Science Weitzmann Institute of Science Rehovot Israel School of Physics University of Melbourne Parkville VIC Australia

According to Noether's theorem, symmetries in a physical system are intertwined with conserved quantities. These symmetries often determine the system topology, which is made ever more complex with increased dimensionality. Quasicrystals have neither translational nor global rotational symmetry, yet they intrinsically inhabit a higher-dimensional space in which symmetry resurfaces. Here, we discovered topological charge vectors in four dimensions (4D) that govern the real-space topology of 2D quasicrystals and reveal their inherent conservation laws. We demonstrate control over the topology in pentagonal plasmonic quasilattices, mapped by both phase-resolved and time-domain near-field microscopy, showing that their temporal evolution continuously tunes the 2D projections of their distinct 4D topologies. Our work provides a route to experimentally probe the thermodynamic properties of quasicrystals and topological physics in 4D and above.

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An Enhanced Resource Selection Scheme for Efficient Intra-Platoon Message Delivery

An Enhanced Resource Selection Scheme for Efficient Intra-Pl...

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2024 IEEE Global Communications Conference, GLOBECOM 2024

作者： Wang, Bingying Zheng, Jun Li, Cheng Nanjing University of Information Science and Technology School of Electronics and Information Engineering Nanjing210044 China Southeast University National Mobile Communications Research Laboratory Frontiers Science Center for Mobile Information Communication and Security Nanjing210096 China Purple Mountain Laboratories Nanjing211111 China Simon Fraser University School of Engineering Science BurnabyBCV5A 1S6 Canada Memorial University Department of Electrical and Computer Engineering St. John'sNLA1B 3X5 Canada

ISBN: (纸本)9798350351255

This paper proposes an enhanced resource selection (eInP-RS) scheme for efficient intra-platoon message delivery of cooperative awareness messages (CAMs) and decentralized environmental notification messages (DENMs). To achieve this goal, the eInP-RS scheme allows each vehicle to transmit CAM and DENM packets on a C-V2X channel (CH1) and an 802.11p channel (CH2), separately, and introduces four mechanisms to enhance the standardized sensing-based SPS scheme. A contention window (CW) size adjustment mechanism is introduced to enable a vehicle to adjust its CW size according to the information it collects on CH1 in order to avoid potential packet collisions on CH2;a resource partition mechanism is introduced to divide frequency-time resources in a selection window into two sets in order for vehicles moving in opposite directions to select different resources and thus avoid potential merging collisions on CH1;an intra-platoon cooperation mechanism is introduced to enable the PL of a platoon to know the resource and channel occupation information of the platoon's hidden nodes on CH1 and CH2;and a packet collision detection mechanism is used to enable a non-platoon vehicle to detect packet collisions occurring on both channels after a lane-changing maneuver to avoid potential merging collisions. Simulation results show that the proposed eInP-RS scheme outperforms the standardized sensing-based SPS scheme in terms of the intra-platoon CAM/DENM delivery ratio and the average intra-platoon DENM delivery delay. © 2024 IEEE.

关键词： Magnetic levitation vehicles

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Controllable multi-level switching of optical phase change materials via microheater temperature profile engineering

Controllable multi-level switching of optical phase change m...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Sun, Hongyi Lian, Chuanyu Vásquez-Aza, Francis Huang, Yi-Siou Vitale, Steven A. Takeuchi, Ichiro Hu, Juejun Youngblood, Nathan Pavlidis, Georges Ríos Ocampo, Carlos A. Department of Materials Science & Engineering University of Maryland College ParkMD20742 United States Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD20742 United States Department of Mechanical Engineering University of Connecticut StorrsCT06269 United States Advanced Materials and Microsystems Group MIT Lincoln Laboratory LexingtonMA02139 United States Quantum Materials Center Department of Physics University of Maryland College ParkMD20742 United States Department of Materials Science & Engineering MIT CambridgeMA02139 United States Electrical & Computer Engineering Department The University of Pittsburgh PittsburghPA15213 United States

ISBN: (纸本)9781957171395

We demonstrate doped-silicon-on-insulator microheaters with triangle-like temperature profiles. Such devices control the hotspot size and temperature and, thus, the area that undergoes amorphization or crystallization in optical phase-change materials, leading to controllable multilevel, nonvolatile response. © Optica Publishing Group 2024 © 2024 The Author(s)

关键词： Optical materials

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Controllable multi-level switching of optical phase change materials via microheater temperature profile engineering

Controllable multi-level switching of optical phase change m...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

关键词： Amorphization

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Piezoelectric Nanocavity Interface for Strong Coupling between a Superconducting Circuit, Phonon, and Spin

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Physical Review Applied 2023年第6期19卷 064051-064051页

作者： Hamza Raniwala Stefan Krastanov Lisa Hackett Matt Eichenfield Dirk R. Englund Matthew E. Trusheim Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Sandia National Laboratories Albuqurque New Mexico USA Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA DEVCOM Army Research Laboratory Adelphi Maryland 20783 USA

We introduce a hybrid tripartite quantum system for strong coupling between a semiconductor spin, a mechanical phonon, and a microwave excitation of a superconducting circuit. Consisting of a piezoelectric resonator with an integrated diamond strain concentrator, this system achieves microwave-acoustic and spin-acoustic coupling rates of approximately megahertz or greater, allowing simultaneous ultrahigh cooperativities (approximately 103 and approximately 102, respectively). From finite-element modeling and master-equation simulations, we estimate superconducting-circuit-to-spin quantum state transfer fidelities exceeding 0.95 on the basis of separately demonstrated device parameters. We anticipate that this device will enable hybrid quantum architectures that leverage the advantages of both superconducting circuits and solid-state spins for information processing, memory, and networking.

关键词： Optomechanics Piezoelectric devices Quantum information with hybrid systems Quantum interconnects Semiconductor quantum optics Superconducting quantum optics Transducers

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The development of microfabricated solenoids with magnetic cores for micromagnetic neural stimulation

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Microsystems & Nanoengineering 2021年第6期7卷 97-106页

作者： Adam Khalifa Mohsen Zaeimbashi Tony X.Zhou Seyed Mahdi Abrishami Neville Sun Seunghyun Park TamaraŠumarac Jason Qu Inbar Zohar Amir Yacoby Sydney Cash Nian X.Sun Department of Neurology Massachusetts General HospitalHarvard Medical SchoolBostonMAUSA Department of Electrical and Computer Engineering Northeastern UniversityBostonMAUSA Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMAUSA Department of Physics Harvard UniversityCambridgeMAUSA Department of Chemical and Biological Physics Weizmann Institute of ScienceRehovotIsrael

electrical stimulation via invasive microelectrodes is commonly used to treat a wide range of neurological and psychiatric *** its remarkable success,the stimulation performance is not sustainable since the electrodes become encapsulated by gliosis due to foreign body *** stimulation overcomes these limitations by eliminating the need for a metal-electrode ***,we demonstrate a novel microfabricated solenoid inductor(80µm×40µm)with a magnetic core that can activate neuronal *** characterization and proof-of-concept of the device raise the possibility that micromagnetic stimulation solenoids that are small enough to be implanted within the brain may prove to be an effective alternative to existing electrode-based stimulation devices for chronic neural interfacing applications.

关键词： magnetic neural overcome

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Domain decomposition based on the spectral element method for frequency-domain computational elastodynamics

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science China Earth sciences 2021年第3期64卷 388-403页

作者： Linlin SHI Mingwei ZHUANG Yuanguo ZHOU Na LIU Qinghuo LIU Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Wave Science and Detection Technology Xiamen UniversityXiamen 361005China The Fifth Electronics Research Institute of Ministry of Industry and Information Technology Guangzhou 510610China College of Communication and Information Engineering Xi’an University of Science and TechnologyXi’an 710054China Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA

We propose a domain decomposition method based on the spectral element method(DDM-SEM)for elastic wave computation in frequency *** combines the high accuracy of the spectral element method and the high degree of parallelism of a domain decomposition technique,which makes this method suitable for accurate and efficient simulations of large scale problems in *** the DDM-SEM,the original large-scale problem is divided into a number of well designed *** use the spectral element method independently for each subdomain,and the neighboring subdomains are connected by a frequency-domain version of Riemann transmission condition(RTC)for elastic *** the proposed method,we can employ the non-conforming meshes and different interpolation orders in different subdomains to maximize the *** separating the internal and boundary unknowns of each subdomain,an efficient and naturally parallelizable block LDU direct solver is developed to solve the final system *** experiments verify its accuracy and efficiency,and show that the proposed DDM-SEM can be a promising numerical tool for accurately and effectively solving large and multi-scale problems of elastic *** is potentially valuable for the frequency domain seismic inversion where multiple source illuminations are required.

关键词： Elastic waves Domain decomposition Spectral element method Frequency domain Numerical simulations

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An ab initio framework for understanding and controlling quantum fluctuations in complex light-matter systems

An ab initio framework for understanding and controlling qua...

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CLEO: Fundamental science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Rivera, Nicholas Uddin, Shiekh Zia Seyler, Devin Salamin, Yannick Sloan, Jamison Roques-Carmes, Charles Xu, Shutao Sander, Michelle Soljacic, Marin Department of Physics Harvard University CambridgeMA02138 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States E.L. Ginzton Laboratory Stanford University StanfordCA94305 United States Department of Electrical and Computer Engineering BU Photonics Center Boston University BostonMA02215 United States Division of Materials Science and Engineering Boston University BrooklineMA02446 United States Department of Biomedical Engineering Boston University BostonMA02215 United States

We develop a new general theory of quantum noise in photonics. As an example, we demonstrate strong quantum correlations and squeezing in supercontinuum generation. Our results enable overcoming quantum noise limits i... 详细信息

ISBN: (纸本)9781957171395

关键词： Supercontinuum generation

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RIS-Assisted Grant-Free NOMA

RIS-Assisted Grant-Free NOMA

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IEEE International Conference on Communications (ICC)

作者： Recep Akif Tasci Fatih Kilinc Abdulkadir Celik Asmaa Abdallah Ahmed M. Eltawil Ertugrul Basar Department of Electrical and Electronics Engineering Communications Research and Innovation Laboratory (CoreLab) Koç University Istanbul Turkey Computer Electrical and Mathematical Sciences & Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal KSA

This paper introduces a reconfigurable intelligent surface (RIS)-assisted grant-free non-orthogonal multiple access (GF-NOMA) scheme. To ensure the power reception disparity required by the power domain NOMA (PD-NOMA), we propose a joint user clustering and RIS assignment/alignment approach that maximizes the network sum rate by judiciously pairing user equipments (UEs) with distinct channel gains, assigning RISs to proper clusters, and aligning RIS phase shifts to the cluster members yielding the highest cluster sum rate. Once UEs are acknowledged with the cluster index, they are allowed to access their resource blocks (RBs) at any time requiring neither further grant acquisitions from the base station (BS) nor power control as all UEs are requested to transmit at the same power. In this way, the proposed approach performs an implicit over-the-air power control with minimal control signaling between the BS and UEs, which has shown to deliver up to 20% higher network sum rate than benchmark GF-NOMA and grant-based optimal (OPT) PD-NOMA schemes depending on the network parameters. The given numerical results also investigate the impact of UE density, RIS deployment, and RIS hardware specifications on the overall performance of the proposed RIS-aided GF-NOMA scheme.

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