Photoswitchable anapole metasurfaces
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 ap...
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sg-ntu-dr.10356-1561162023-02-28T20:04:06Z Photoswitchable anapole metasurfaces Wang, Wenhao Srivastava, Yogesh Kumar Gupta, Manoj Wang, Zhiming Singh, Ranjan School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) The Photonics Institute Science::Physics::Optics and light Anapoles Photoswitchable Metasurfaces 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. National Research Foundation (NRF) Submitted/Accepted version W.W. and Z.W. acknowledge the support from the National Key Research and Development Program of China (No. 2019YFB2203400) and the “111 Project” (Grant No. B20030). W.W., Y.K.S., M.G., and R.S. acknowledge funding support from Singapore NRFCRP23-2019-0005 (TERACOMM). W.W. acknowledges the China Scholarship Council for financial support (202006070143) 2022-04-06T06:44:31Z 2022-04-06T06:44:31Z 2022 Journal Article Wang, W., Srivastava, Y. K., Gupta, M., Wang, Z. & Singh, R. (2022). Photoswitchable anapole metasurfaces. Advanced Optical Materials, 10(4), 2102284-. https://dx.doi.org/10.1002/adom.202102284 2195-1071 https://hdl.handle.net/10356/156116 10.1002/adom.202102284 2-s2.0-85121454769 4 10 2102284 en NRFCRP23-2019-0005 (TERACOMM) Advanced Optical Materials 10.21979/N9/SEO9DL 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 https://doi.org/10.1002/adom.202102284. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. application/pdf |
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Science::Physics::Optics and light Anapoles Photoswitchable Metasurfaces Wang, Wenhao Srivastava, Yogesh Kumar Gupta, Manoj Wang, Zhiming Singh, Ranjan Photoswitchable anapole metasurfaces |
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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. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Wang, Wenhao Srivastava, Yogesh Kumar Gupta, Manoj Wang, Zhiming Singh, Ranjan |
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Article |
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Wang, Wenhao Srivastava, Yogesh Kumar Gupta, Manoj Wang, Zhiming Singh, Ranjan |
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Wang, Wenhao |
title |
Photoswitchable anapole metasurfaces |
title_short |
Photoswitchable anapole metasurfaces |
title_full |
Photoswitchable anapole metasurfaces |
title_fullStr |
Photoswitchable anapole metasurfaces |
title_full_unstemmed |
Photoswitchable anapole metasurfaces |
title_sort |
photoswitchable anapole metasurfaces |
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2022 |
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https://hdl.handle.net/10356/156116 |
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