Category: 4. Physics
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Dual plasmonic modes in the visible light region in rectangular wave-shaped surface relief plasmonic gratings
Long-range surface plasmon resonance characteristics Figure 4a shows the reflectance spectra measured from the diffracted beams of an RSR-PG sample. The RSR-PG structure was placed at various incident angles, namely 45°, 50°, 55°, or 60° normal to the RSR-PG surface. The photodetector then sequentially measured the reflectance beam at various angles normal to the RSR-PG surface,…
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Passive atomic-scale optical sensors for mapping light flux in ultra-small cavities
Four rock cores were first irradiated with gamma rays to create trapped electrons (mapped using IRPL), and then cut in half along the axis. Cracks of different widths were simulated by placing spacers between the two halves. All these steps were done under dark conditions. The ‘cracked’ rock cores were then positioned under a solar…
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Spinful hinge states in the higher-order topological insulators WTe2
Multilayer Td-WTe2 has a noncentrosymmetric orthorhombic structure belonging to the SG 31 (Pmn21) space group with two perpendicular axes (a– and b-axis) and one mirror line along the b-axis (Fig. 1a). Together with the time-reversal symmetry, this spatial mirror symmetry satisfies necessary prerequisites to support the topologically non-trivial spin-polarized helical hinges26,28. In our experiments, multilayer WTe2…
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Twin-pulse seeding enables pump-probe capabilities in the EUV to soft X-ray spectrum at synchrotron light sources
Feasibility study of an adjustable two-stage separation Seeding coherent EUV to soft X-ray emission can be accomplished using a compact EEHG design via two SSs of a SR1,2. This design utilizes the BM section between these two SSs as the first chicane. However, one of the key EEHG parameters, the momentum compaction of chicane 1,…
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Motility-induced phase separation is reentrant
Theoretical analysis We start from a minimal active fluid theory characterizing MIPS from a kinetics approach21,22,38. The theory describes the steady state of phase separation with a dense clustering phase which is set as close packed and a dilute phase as homogeneous and isotropic. Particles transport between two phases through condensation and evaporation events with…
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Tunnelling electrons locally ignite excitons
Tunnelling electrons locally ignite excitons Continue Reading News Source: www.nature.com
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Exploiting dark autoionizing states for enhancing extreme ultraviolet lasers
An international research team led by Professors Tsuneyuki Ozaki and François Légaré at the Institut national de la recherche scientifique (INRS) in Canada, has developed a unique method to enhance the power of a laser source emitting extreme ultraviolet light pulses. Credit: INRS An international research team led by Professors Tsuneyuki Ozaki and François Légaré…
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Moiré superlattices show superpower in photonics and optoelectronics
Moiré photonics and optoelectronics. Credit: Institute of Physics Researchers from the Institute of Physics (IOP) of the Chinese Academy of Sciences, collaborating with international colleagues, have presented an overview of recent progress in emerging moiré photonics and optoelectronics. It was published in Science on March 30. Moiré superlattices are artificial quantum materials formed by… Continue…
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Ultrasmall swirling magnetic vortices detected in iron-containing material
Simulation capturing the different swirling textures of skyrmions and merons observed in ferromagnet thin film. Credit: University of Edinburgh/based on microscopy images collected by Argonne on samples prepared at MagLab Microelectronics forms the foundation of much modern technology today, including smartphones, laptops and even supercomputers. It is based on the ability to allow and stop…
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Controlling turbulent heat transport by manipulating coherent structures
Instantaneous flow fields (a, b) and time-averaged heat flux fields (c, d) in a canonical thermal turbulence system with rectangular geometry. By applying spatial confinement through decreasing the lateral sizes of the system, the domain-sized circulatory flow is replaced by more energetic thermal coherent structures (indicated by the red/blue structures). This manipulation in the coherent…