Structured light excitation of toroidal dipoles in dielectric nanodisks

Masoudian Saadabad, R., Cai, M., Deng, F., Xu, L. ORCID: 0000-0001-9071-4311 and Miroshnichenko, A.E., 2021. Structured light excitation of toroidal dipoles in dielectric nanodisks. Physical Review B, 104 (16): 165402. ISSN 2469-9950

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Abstract

Conventional electromagnetic multipoles can be completed by complementary sources of toroidal moments, opening the door to the engineering of nanophotonic devices. The main contribution of this study is comparing different light sources for enhancing the toroidal dipole response in a given system. We theoretically study the toroidal dipole excitation in an individual dielectric nanodisk by structured light illumination, including the tightly focused radially polarized beam and the focused doughnut pulse. The toroidal dipole and anapole can be excited by the interplay of the radial and longitudinal components of the incident light. As opposed to the plane wave illumination, the tightly focused radially polarized light can excite a near-ideal toroidal dipole while the contributions of the Cartesian electric dipole and other modes are significantly suppressed. We also show that the focused doughnut pulse is a promising tool for exciting a resonant toroidal response in nanophotonic systems. Furthermore, it is demonstrated that toroidal-driven field confinement leads to an enhancement of energy concentration inside the nanodisk that can potentially increase light harvesting and boost both linear and nonlinear light-matter interactions.

Item Type: Journal article
Publication Title: Physical Review B
Creators: Masoudian Saadabad, R., Cai, M., Deng, F., Xu, L. and Miroshnichenko, A.E.
Publisher: American Physical Society (APS)
Date: 1 October 2021
Volume: 104
Number: 16
ISSN: 2469-9950
Identifiers:
NumberType
10.1103/physrevb.104.165402DOI
1486679Other
Rights: ©2021 American Physical Society. Masoudian Saadabad, R., Cai, M., Deng, F., Xu, L., & Miroshnichenko, A. E. (in press). Structured light excitation of toroidal dipoles in dielectric nanodisks. Physical Review B, 104(16), https://doi.org/10.1103/physrevb.104.165402.
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 05 Nov 2021 12:22
Last Modified: 05 Nov 2021 12:22
URI: http://irep.ntu.ac.uk/id/eprint/44625

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