2024/11/05 by Asaf Farhi, Farhi, Asaf, Haim Suchowski +1 · 1 citation
Chemistry · Materials Science · #Applied Physics (physics.app-ph) #Electron and X-Ray Spectroscopy Techniques #Electrostatics and Colloid Interactions #FOS: Physical sciences #Soft Condensed Matter (cond-mat.soft)
paper · pdf · doi:10.48550/arxiv.2411.03378
openalex publication_date 2024/11/05 · openalex created_date 2024/11/15 · openalex updated_date 2026/07/28
Nanophotonics enables precise control over light-matter interactions, though most established design frameworks for subwavelength nanoparticles rely on isotropic materials. Uniaxial and biaxial particles -- common in natural and engineered systems -- introduce new degrees of freedom coupling geometry and material properties, unlocking multispectral and directional response in previously unexplored spectral regions. We present a universal full-wave framework for eigenmodes and resonances in such nanoparticles. Closed-form solutions reveal axial-permittivity sum rules and anisotropy-induced symmetry breaking, producing resonance splitting and novel radiation patterns. Generalizing to ellipsoids enables geometric tuning of multispectral response, while analytic quality factors elucidate mode localization and loss. Full-wave simulations of h-BN and α-MoO3 particles confirm the theory. This framework unifies the understanding of anisotropic nanostructures across optics, magnetism, and thermal transport, opening pathways to a new generation of photonic devices with tunable multispectral response and controlled emission with direct applications in sensing and imaging