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Suppression without Thawing: Constraining Structure Formation and Dark Energy with Galaxy Clustering.
Phys Rev Lett
December 2024
Department of Astronomy, Cornell University, Ithaca, New York 14853, USA.
We present a new perturbative full-shape analysis of BOSS galaxy clustering data, including the full combination of the galaxy power spectrum and bispectrum multipoles, baryon acoustic oscillations, and cross-correlations with the gravitational lensing of cosmic microwave background measured from Planck. Assuming the ΛCDM model, we constrain the matter density fraction Ω_{m}=0.3138±0.
View Article and Find Full Text PDFObservation of the Generalized Kerker Effect Mediated by Quasi-Bound States in the Continuum.
Nano Lett
December 2024
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University, Wuxi 214122, China.
The generalized Kerker effect (GKE) arising from the interference of high-order multipoles has attracted more interest due to its direct correlation with various functionalities in nanophotonics. The realization of the GKE at oblique incidence is highly desired yet remains underexplored. Herein, we report the experimental observation of the GKE by leveraging quasi-bound states in the continuum (QBICs) supported by a silicon metasurface.
View Article and Find Full Text PDFGeometric Phase-Driven Scattering Evolutions.
Phys Rev Lett
August 2024
College for Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, People's Republic of China.
Conventional approaches for scattering manipulations largely rely on the technique of field expansions into spherical harmonics (electromagnetic multipoles), which nevertheless is not only nongeneric (expansion coefficients depend on the origin position of the coordinate system) but also more descriptive than predictive. Here, we explore this classical topic from a different perspective of controlled excitations and interferences of quasinormal modes (QNMs) supported by the scattering system. Scattered waves are expanded into coherent additions of QNMs, among which the relative amplitudes and phases are crucial factors to architect for scattering manipulations.
View Article and Find Full Text PDFTerahertz binary computing in a coupled toroidal metasurface.
Sci Rep
April 2024
Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India.
The applications of terahertz metamaterials are being actively explored in recent times for applications in high-speed communication devices, miniature photonic circuits, and bio-chemical devices because of their wide advantages. The toroidal resonance, a new type of metasurface resonance, has been examined with great interest to utilize its properties in terahertz metasurface applications. This study reports a proof of concept design of a toroidal metasurface that experimentally demonstrates binary computing operations in the terahertz frequency regime.
View Article and Find Full Text PDFAdaptive multipole models of optically pumped magnetometer data.
Hum Brain Mapp
March 2024
Department of Imaging Neuroscience, UCL Queen Square Institute of Neurology, University College London, London, UK.
Multipole expansions have been used extensively in the Magnetoencephalography (MEG) literature for mitigating environmental interference and modelling brain signal. However, their application to Optically Pumped Magnetometer (OPM) data is challenging due to the wide variety of existing OPM sensor and array designs. We therefore explore how such multipole models can be adapted to provide stable models of brain signal and interference across OPM systems.
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