#synchrotronscience MECHANISMS OF ELECTRICAL SWITCHING IN ANTIFERROMAGNETS 👉 https://lnkd.in/dmCKinc7 A study lead by researchers from the Johannes Gutenberg-Universität Mainz proves that #switching in #antiferromagnet is controlled by the combination of two mechanisms when those materials are subjected to a current pulse. Researchers imaged antiferromagnets, which are considered very promising materials for future #spintronic applications such as #datastorage and #computation, at the PEEM end station of the CIRCE beamline at the #ALBASynchrotron.
ALBA Synchrotron’s Post
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We utilize a dielectric metasurface to excite quasi-bound states in the continuum for enhancing photocatalysis. One key advantage is that the metasurface is virtually lossless and all the absorbed electromagnetic energy is funneled into the catalysts to accelerate the reaction rate. The approach opens to novel nanophotonic phenomena for manipulating chemical reactions. Great collaboration with Halas and Nordlander groups. See the details in the just published Nano Letters paper: https://lnkd.in/gqxdh2cJ Thanks to Lin Yuan, Yage Zhao, Andrea Toma, Vincenzo Aglieri, Burak Gerislioglu, PhD, Yigao Yuan, Minghe Lou, Ogundare Adebola, Peter Nordlander, Naomi Halas Rice University Electrical and Computer Engineering
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https://lnkd.in/eWDimkhi A quantum-mathematical model to state single photon (electron) double slit experiment, Fraunhofer and Fresnel diffractions
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Very interesting paper done by imec team sharing their breakthrough in GaN-on-Si power device fabrication onto 200mm wafers reaching 1200V rated transistor using a lateral HEMT structure with pGaN gate. The results have been achieved using QST wafers that from my current understanding seems quite important to reach high breakdown voltages having high buffer thickness mantaining a controlled wafer bow.
In this paper, published and editor's choice in IEEE Electron Device Letters, imec researchers share a breakthrough in power transistors for 1200 V application on 200 mm engineered substrates. Using Qromis, Inc. (QST®) substrates and buffers grown in an AIXTRON G5+ C planetary reactor, our power transistors display impressive performance, offering a cost-effective and scalable solution and is vital for high-efficiency power conversion systems. Particularly in electric vehicles and numerous industrial applications, showcasing the potential for reliable, commercially viable 1200 V switches. Full paper: https://lnkd.in/e2HNAJ4y
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"Recently, the research team led by Prof. Du Haifeng from the High Magnetic Field laboratory at Hefei Institutes of Physical Science of the Chinese Academy of Sciences achieved stable magnetic bundles at room temperature without the need for any external magnetic field. Their work is published in Nature Communications. Topological magnetic structures are a type of spin arrangement with nontrivial topological properties. These structures hold promise as the next-generation data carriers and could overcome the limitations of traditional magnetic storage technologies in spintronics. In previous research, the team proposed a method for inducing magnetic skyrmion bundles in a chiral helimagnetic material called FeGe. However, achieving stable magnetic bundles at room temperature and without an external magnetic field remained a significant challenge for practical applications in spintronics." #spintronics #datamemory #roomtemperature #stablemagneticbundles
Stable magnetic bundles achieved at room temperature and zero magnetic field
phys.org
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PhD / EMBA | PA Designer | RF Design SME | EM Modeling | Cross functional expertise in Semiconductors for RF | IC/Module Design | RFIC Layout | Full cycle product development | Data Analytics
Post on Series Resonant Circuits: https://lnkd.in/g3Q2j2bC
Series Resonant Circuits
zaynesemi.com
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PhD, IISc Bangalore | IEEE Photonics Society Graduate Student Award recipient 2023 | IEEE HKN Honor Society Life time Member
Who knew letters could be this scientific!!! 😉 Do check out our latest journal article, "Design and Optimization of Angle-Dependent Grating Couplers for Wideband Near-Mid Infrared Transmission," in IEEE Sensors Letter! Congratulations and heartfelt gratitude to all the authors !! https://lnkd.in/gZZerBZN #NearToMidInfraredPhotonics #PhotonicsResearch #IEEE #IEEESENSORSLETTERS
Design and Optimization of Angle-Dependent Grating Couplers for Wideband Near-Mid Infrared Transmission
ieeexplore.ieee.org
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Scientists measured spin behaviors with great precision, in a material composed of a variety of magnetic ions under an applied microwave field. Such complex magnetic materials have broad electronic applications that are often driven by microwaves. https://lnkd.in/gw3f445K
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I would like to share my latest paper published recently in ACS Photonics in collaboration with Prof. Jacob Khurgin from The Johns Hopkins University about on-chip Schottky photodetectors for Photonic Integrated Circuits (PICs). Silicon photonics has many attractive features but faces a major issue: inefficient and slow photodetection in the telecom range. New metal-semiconductor Schottky photodetectors based on intraband absorption address this problem, but their efficiency remains low. We suggest that by creating a junction between silicon and a transparent oxide with appropriate doping, which results in a real permittivity close to zero (known as the epsilon near zero or ENZ regime), detection efficiency could increase by more than 10-fold. Using Aluminum Zinc Oxide (AZO) as an example, we design an optimized AZO/Si slot photonic waveguide detector that could potentially reach an efficiency of several tens of percent, in contrast to a few percent for a metal/Si Schottky detector. This increase is primarily due to the lower density of states in AZO compared to metal, along with superior coupling efficiency and strong absorption within a 10 nm slot. We focus in this paper on ZnO-based compound as it is biocompatible, biodegradable, biosecure, cheap, CMOS-compatible (as other TCO materials) and is already considered for sensing, optoelectronic and storage applications. However, the family of transparent conductive oxides (TCOs) is very broad, thus, they can operate in a wide range of wavelengths from UV to MIR what opens new possibilities for PICs in NIR and MIR. https://lnkd.in/dwTQ-DhD
Schottky Photodetectors with Transparent Conductive Oxides for Photonic Integrated Circuits
pubs.acs.org
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High-Efficiency Coupling of Free Electrons to Sub-λ3 Modal Volume, High-Q Photonic Cavities "report on the design, realization, and experimental investigation by spatially resolved monochromated #electron_energy_loss #spectroscopy (#EELS) of high-quality-factor cavities with modal volumes smaller than λ3, with λ being the free-space wavelength of light. The cavities are based on a slot defect in a 2D #photonic crystal slab made up of silicon. They are optimized for high coupling of electrons accelerated to 100 kV to quasi-transverse electrical modes polarized along the slot direction. We studied the cavities in two geometries and took advantage of the deep sub-optical wavelength spatial resolution of the electron microscope and high spectral resolution of the monochromator to comprehensively describe the optical excitations of the slab. The first geometry, for which the cavities have been designed, corresponds to an electron beam traveling along the slot direction. The second consists of the electron beam traveling perpendicular to the slab. In both cases, a large series of modes is identified. The dielectric slot mode energies are measured to be in the 0.8–0.85 eV range, as per design, and surrounded by two bands of dielectric and air modes of the photonic structure. The dielectric even slot modes, to which the cavity mode belongs, are highly coupled to the electrons with up to 3.2% probability of creating a slot photon per incident electron. Although the experimental spectral resolution (around 30 meV) alone does not allow to disentangle cavity photons from other slot photons, the excellent agreement between the experiments and finite-difference time-domain simulations allows us to deduce that among the photons created in the slot, around 30% are stored in the cavity mode. A systematic study of the energy and coupling strength as a function of the photonic band gap parameters permits us to foresee an increase of coupling strength by fine-tuning phase-matching. Our work demonstrates free electron coupling to high-quality-factor cavities with low mode densities and sub-λ3 modal volumes, making it an excellent candidate for applications such as #quantum_nano_optics with free electrons." Malo Bezard, Luigi Ruggiero, Yves Auad, Luiz Tizei, Mathieu Kociak, Université Paris-Saclay, Centre national de la recherche scientifique CNRS,Laboratoire de Physique des Solides (LPS), Orsay, France; Imene SI HADJ MOHAND, Arthur Le Roux, Paul Baroux, Xavier Checoury, C2N - Centre de Nanosciences et de Nanotechnologies, Centre national de la recherche scientifique, Université Paris-Saclay, Palaiseau, France. https://lnkd.in/dvDdkh6Z
In a recent experiment, researchers from Université Paris-Saclay demonstrated a model device that can be used to study quantum nano-optics systems with free electrons. Using the MerlinEELS detector from Quantum Detectors, they were able to study high-quality factor cavities in photonic crystals, with volumes smaller than visible light wavelengths. The cavities were optimised for interactions with a 100 kV electron beam. Explore more in the publication: https://lnkd.in/dFv8FAtf or find out about the MerlinEELS on our site https://lnkd.in/djWPjeWq #electronmicroscopy #EELS #detectortechnology #quantum #innovation
High-Efficiency Coupling of Free Electrons to Sub-λ3 Modal Volume, High-Q Photonic Cavities
pubs.acs.org
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Explore a thorough analysis of the structural and optical characteristics of YVO4:Eu3+ red phosphor, shedding light on its potential applications in advanced lighting and display technologies. #MaterialsScience #Optoelectronics #PhosphorResearch
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