Probing optical anapoles with fast electron beams
Artikel i vetenskaplig tidskrift, 2023

Optical anapoles are intriguing charge-current distributions characterized by a strong suppression of electromagnetic radiation. They originate from the destructive interference of the radiation produced by electric and toroidal multipoles. Although anapoles in dielectric structures have been probed and mapped with a combination of near- and far-field optical techniques, their excitation using fast electron beams has not been explored so far. Here, we theoretically and experimentally analyze the excitation of optical anapoles in tungsten disulfide (WS2) nanodisks using Electron Energy Loss Spectroscopy (EELS) in Scanning Transmission Electron Microscopy (STEM). We observe prominent dips in the electron energy loss spectra and associate them with the excitation of optical anapoles and anapole-exciton hybrids. We are able to map the anapoles excited in the WS2 nanodisks with subnanometer resolution and find that their excitation can be controlled by placing the electron beam at different positions on the nanodisk. Considering current research on the anapole phenomenon, we envision EELS in STEM to become a useful tool for accessing optical anapoles appearing in a variety of dielectric nanoresonators.

Författare

Carlos Maciel-Escudero

CIC nanoGUNE

Consejo Superior de Investigaciones Científicas (CSIC)

Andrew Yankovich

Chalmers, Fysik, Nano- och biofysik

Battulga Munkhbat

Danmarks Tekniske Universitet (DTU)

Chalmers, Fysik, Nano- och biofysik

Denis Baranov

Chalmers, Fysik, Nano- och biofysik

Moscow Institute of Physics and Technology

Rainer Hillenbrand

CIC nanoGUNE

Basque Foundation for Science (Ikerbasque)

Eva Olsson

Chalmers, Fysik, Nano- och biofysik

Javier Aizpurua

Consejo Superior de Investigaciones Científicas (CSIC)

Donostia International Physics Center

Timur Shegai

Chalmers, Fysik, Nano- och biofysik

Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 14 1 8478

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Ämneskategorier (SSIF 2011)

Beräkningsmatematik

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1038/s41467-023-43813-y

PubMed

38123545

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Senast uppdaterat

2025-03-09