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Title: Photoswitchable anapole metasurfaces
Authors: Wang, Wenhao
Srivastava, Yogesh Kumar
Gupta, Manoj
Wang, Zhiming
Singh, Ranjan
Keywords: Science::Physics::Optics and light
Issue Date: 2022
Source: Wang, W., Srivastava, Y. K., Gupta, M., Wang, Z. & Singh, R. (2022). Photoswitchable anapole metasurfaces. Advanced Optical Materials, 10(4), 2102284-.
Project: NRFCRP23-2019-0005 (TERACOMM)
Journal: Advanced Optical Materials
Abstract: Nonradiating charge-current configurations have attracted attention in photonics for the efficient localization of the electromagnetic field. Anapole mode is a unique nonradiating state of light induced by the interference of electric and toroidal dipole that possesses rich physics with potential applications in micro-nanophotonics. Active control of an anapole is essential for the design and realization of tunable low-energy photonic devices. Here, an active anapole metasurface device is experimentally demonstrated as a switch for the terahertz waves. The metadevice consists of planar resonators with photoactive inclusions of silicon patches in a hybrid metal–semiconductor configuration. The active element enables dynamic control over the contributions of the multipoles that eventually determine the formation of the exotic anapoles that host extreme nonradiative confinement and its active switching into sub-radiative Fano resonance and highly radiative electric dipoles. Two orders of magnitude change in the near-field intensity of the anapole that leads to 201% extinction modulation is further demonstrated. The anapole metadevice provides a platform to efficiently control both the far-field radiation and near-field enhancement in metaoptics, promoting active micro-nanophotonic devices for potential applications in terahertz modulators, lasers, filters, and dynamic near-field imaging.
ISSN: 2195-1071
DOI: 10.1002/adom.202102284
DOI (Related Dataset): 10.21979/N9/SEO9DL
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
The Photonics Institute 
Rights: This is the peer reviewed version of the following article: Wang, W., Srivastava, Y. K., Gupta, M., Wang, Z. & Singh, R. (2022). Photoswitchable anapole metasurfaces. Advanced Optical Materials, 10(4), 2102284-, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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