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Seeing the Unseen: Experimental Observation of Magnetic Anapole State Inside a High‐Index Dielectric Particle
Author(s) -
Kapitanova Polina,
Zanganeh Esmaeel,
Pavlov Nikita,
Song Mingzhao,
Belov Pavel,
Evlyukhin Andrey,
Miroshnichenko Andrey
Publication year - 2020
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.202000293
Subject(s) - physics , microwave , dielectric , magnetic field , dipole , range (aeronautics) , particle (ecology) , field (mathematics) , magnetic dipole , computational physics , lasing threshold , discrete dipole approximation , photonics , condensed matter physics , optics , laser , optoelectronics , quantum mechanics , materials science , oceanography , geology , mathematics , pure mathematics , composite material
Abstract The existence of non‐radiating electromagnetic sources attracts much attention in photonic community and gives rise to extensive discussions of various applications in lasing, medical imaging, sensing, and nonlinear optics. In this article, the existence of magnetic anapole states (or magnetic‐type non‐radiating sources) characterized by a suppressed magnetic dipole radiation in a dielectric cylindrical particle is theoretically predicted and experimentally demonstrated. The specific features of the magnetic anapole state under ideal conditions are identified, followed by a demonstration of how their existence can be detected in practical structures. The concept is valid in various frequency bands from visible range for nanoparticles to microwave range for millimeter size objects. The experimental study is performed in microwave frequency range which allows not only to measure the far‐field (scattered field) characteristics, but also to probe the peculiar field profile directly inside the dielectric particle. The experimental results agree well with the analytical ones and pave the way to detect and identify nontrivial different‐type anapole states.