Decoupling of anapole condition and near-field energy maximum in on-chip excitation of high-index nanodisks (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Decoupling of anapole condition and near-field energy maximum in on-chip excitation of high-index nanodisks

Caption

a, Schematics of the on-chip geometry coupling light from an integrated feed waveguide to a high-index nanodisk. At the anapole condition, far-field scattering is drastically reduced while the excited mode allows to concentrate energy inside the nanodisk. b, Calculated far-field scattering response and near-field intensity for a disk of radius r=375nm. The minimum of the normalized scattering and maximum of the field intensity inside the disk are distinctly shifted in wavelength. c, Experimentally retrieved in-plane near-field structure of the mode at the anapole condition, showing the double-vortex structure of the contributing toroidal moment. The white arrows represent the field direction at the time-snapshot where the field is maximized in the center of the disk.

Credit

by Evelyn Díaz-Escobar, Thomas Bauer, Elena Pinilla-Cienfuegos, Ángela I. Barreda, Amadeu Griol, L. Kuipers & Alejandro Martínez

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Credit must be given to the creator.

License

CC BY

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