Engineering of Active and Passive Loss in High-Quality-Factor Vanadium Dioxide-Based BIC Metasurfaces
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Date
2024-08-27
Authors
Aigner, Andreas
Ligmajer, Filip
Rovenská, Katarína
Holobrádek, Jakub
Idesová, Beáta
Maier, Stefan A.
Tittl, Andreas
Menezes, Leonardo de S.
0000-0003-0346-4110Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
AMER CHEMICAL SOC
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Abstract
Active functionalities of metasurfaces are of growing interest in nanophotonics. The main strategy employed to date is spectral resonance tuning affecting predominantly the far-field response. However, this barely influences other essential resonance properties like near-field enhancement, signal modulation, quality factor, and absorbance, which are all vital for numerous applications. Here we introduce an active metasurface approach that combines temperature-tunable losses in vanadium dioxide with far-field coupling tunable symmetry-protected bound states in the continuum. This method enables exceptional precision in independently controlling both radiative and nonradiative losses. Consequently, it allows for the adjustment of both the far-field response and, notably, the near-field characteristics like local field enhancement and absorbance. We experimentally demonstrate continuous tuning from under- through critical- to overcoupling, achieving quality factors of 200 and a relative switching contrast of 78%. Our research marks a significant step toward highly tunable metasurfaces, controlling both near- and far-field properties.
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Citation
NANO LETTERS. 2024, vol. 24, issue 35, p. 10742-10749.
https://pubs.acs.org/doi/10.1021/acs.nanolett.4c01703
https://pubs.acs.org/doi/10.1021/acs.nanolett.4c01703
Document type
Peer-reviewed
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Published version
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Language of document
en