Seeing the Unseen
Experimental Observation of Magnetic Anapole State Inside a High-Index Dielectric Particle
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.
Details
- Organisationseinheit(en)
-
Institut für Quantenoptik
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
- Externe Organisation(en)
-
St. Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO)
University of New South Wales (UNSW)
- Typ
- Artikel
- Journal
- Annalen der Physik
- Band
- 532
- ISSN
- 0003-3804
- Publikationsdatum
- 11.12.2020
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Allgemeine Physik und Astronomie
- Elektronische Version(en)
-
https://doi.org/10.1002/andp.202000293 (Zugang:
Geschlossen
)
http://hdl.handle.net/1959.4/unsworks_75982 (Zugang: Offen )
