Abstract

Significant attention has been devoted to realizing non-radiating states (popularly known as anapole states) in several systems due to the strong localization of electromagnetic fields, which can be attained through destructive interference of various dipole moments, yielding fundamental or higher-order anapole states. Recently, it has been shown that the interference of higher-order excitation also permits light manipulation at the nanoscale and provides additional benefits such as efficient power transfer and enhancement in nonlinearities. In this work, we report discrete electric anapole (pseudo and hybrid) by careful design of an all-dielectric metasurface consisting of a silicon nanodisk such that a higher-order toroidal electric dipole (TD) and quadrupole interfere destructively, producing a hybrid anapole at 815 nm, whereas the pseudo anapole is generated when TD and second-order TD minima occur at the same wavelength of 522 nm. The phase plots confirm the findings of these radiationless states. Such dual and distinct non-radiating current configurations may find applications in spectroscopy, sensing, switching, optical nonlinearity, and optomechanics.

© 2023 Optica Publishing Group

Realization of a photoswitchable anapole metasurface based on phase change material Ge₂Sb₂Te₅

Xiaoyun Wang, Xiaojing Lu, and Zhengwei Xia
Appl. Opt. 62(35) 9253-9260 (2023)

Generalized hybrid anapole modes in all-dielectric ellipsoid particles [Invited]

Anar K. Ospanova, Alexey Basharin, Andrey E. Miroshnichenko, and Boris Luk’yanchuk
Opt. Mater. Express 11(1) 23-34 (2021)

Plasmonic anapole states of active metamolecules

Gui-Ming Pan, Fang-Zhou Shu, Le Wang, Liping Shi, and Andrey B. Evlyukhin
Photon. Res. 9(5) 822-828 (2021)

Low loss sensitivity of the anapole mode in localized defective nanoparticles

Yujie Zhang, Guang Chen, Jia Zhao, Chuanning Niu, and Zuojia Wang
Appl. Opt. 62(11) 2952-2959 (2023)

Engineering non-radiative anapole modes for broadband absorption enhancement of light

Ren Wang and Luca Dal Negro
Opt. Express 24(17) 19048-19062 (2016)