Tag: Scattering
Defective atomic lattice enables unidirectional reflection lasing
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in OpticsWhat the study found The study reports a scheme for mode-tunable unidirectional reflection lasing using a coherent gain atomic system and a one-dimensional defective atomic lattice. The authors describe this as a single system that combines nonreciprocity and lasing oscillation. Why the authors say this matters The authors say the approach could improve the efficiency…
Spin-dependent absorptive scattering shows universal patterns
What the study found The study finds that absorptive scattering of compact spinning bodies can be described with a finite number of Wilson coefficients, which are parameters used in effective theories to capture unknown microscopic effects. It also reports universal patterns in the leading-order impulse, including identical Casimir-independent contributions for spin-up and spin-down transitions of…
Mie scattering explains the bright central Poisson spot
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in OpticsWhat the study found The study found that Mie scattering theory, which describes how waves scatter from spherical objects, offers a new explanation for the Poisson spot, also called the Arago or Fresnel spot. It also shows that the diffraction patterns from a sphere and from a circular disk can be understood as complementary outcomes…
Method speeds up TDDFT calculations for XRTS analysis
What the study found The study found a broadly applicable method for improving the efficiency of time-dependent density functional theory (TDDFT) calculations used to model X-ray Thomson scattering (XRTS) and related dynamic material properties. The authors report speed-ups of up to an order of magnitude without introducing any significant bias. Why the authors say this…
Glacial meltwater and coccolithophore blooms look optically similar in fjords
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in OceanographyGlacial meltwater and coccolithophore blooms produce indistinguishable optical signatures in Norwegian fjords, limiting satellite remote sensing. Inherent optical properties reveal differences.
Laser polarization affects relativistic electron-impact scattering
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Theoretical study derives scattering cross sections for electron-hydrogen collisions in dual orthogonally polarized laser fields, confirming polarization effects and Kroll-Watson sum rule validity.
VSDM release supports dark matter scattering calculations
VSDM version 0.3 provides Julia and Python tools for computing dark matter scattering rates in anisotropic detector materials through partial rate matrix calculations.
Python and Julia tools for dark matter detection calculations
New software implementations accelerate calculations for directional dark matter detection using anisotropic crystal targets, enabling faster signal-background discrimination.
Modified scattering cross section reconciles two photon descriptions
Reconciliation of Pryce-Ward and Klein-Nishina cross sections for Compton scattering of entangled positronium annihilation photons via modified semi-classical simulation framework.
