Anapole states—characterized by a strong suppression of far-field scattering—naturally arise in high-index nanoparticles as a result of the interference between certain multipolar moments. Recently, the first-order electric anapole, resulting from the interference between the electric and toroidal dipoles, was characterized under in-plane illumination as required in on-chip photonics. Here, we go a step further and report on the observation of higher-order (magnetic and second-order electric) anapole states in individual silicon disks under in-plane illumination. To do so, we increase the disk dimensions (radius and thickness) so that such anapoles occur at telecom wavelengths. Experiments show dips in the far-field scattering perpendicular to the disk plane at the expected wavelengths and the selected polarizations, which we interpret as a signature of high-order anapoles. Some differences between normal and in-plane excitation are discussed, in particular, the non-cancelation of the sum of the Cartesian electric and toroidal moments for in-plane incidence. Our results pave the way toward the use of different anapole states in photonic integrated circuits either on silicon or other high-index dielectric materials.
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14 November 2022
Research Article|
November 14 2022
Experimental observation of higher-order anapoles in individual silicon disks under in-plane illumination
Evelyn Díaz-Escobar;
Evelyn Díaz-Escobar
(Data curation, Software, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Nanophotonics Technology Center, Universitat Politècnica de València
, Camino de Vera s/n, 46022 Valencia, Spain
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Ángela I. Barreda
;
Ángela I. Barreda
(Data curation, Formal analysis, Investigation, Methodology, Software, Writing – review & editing)
1
Nanophotonics Technology Center, Universitat Politècnica de València
, Camino de Vera s/n, 46022 Valencia, Spain
2
Friedrich Schiller University Jena, Institute of Solid State Physics
, Max-Wien-Platz 1, 07743 Jena, Germany
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Amadeu Griol
;
Amadeu Griol
(Investigation, Methodology)
1
Nanophotonics Technology Center, Universitat Politècnica de València
, Camino de Vera s/n, 46022 Valencia, Spain
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Alejandro Martínez
Alejandro Martínez
a)
(Funding acquisition, Investigation, Methodology, Supervision, Writing – original draft, Writing – review & editing)
1
Nanophotonics Technology Center, Universitat Politècnica de València
, Camino de Vera s/n, 46022 Valencia, Spain
a)Author to whom correspondence should be addressed: amartinez@ntc.upv.es
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a)Author to whom correspondence should be addressed: amartinez@ntc.upv.es
Appl. Phys. Lett. 121, 201105 (2022)
Article history
Received:
July 08 2022
Accepted:
October 30 2022
Citation
Evelyn Díaz-Escobar, Ángela I. Barreda, Amadeu Griol, Alejandro Martínez; Experimental observation of higher-order anapoles in individual silicon disks under in-plane illumination. Appl. Phys. Lett. 14 November 2022; 121 (20): 201105. https://doi.org/10.1063/5.0108438
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