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Engineering of active and passive loss in high-quality-factor vanadium dioxide-based BIC metasurfaces
Publikationstyp
Journal Article
Date Issued
2024-08-27
Sprache
English
Author(s)
Aigner, Andreas
Rovenská, Katarína
Holobrádek, Jakub
Idesová, Beáta
Journal
Volume
24
Issue
35
Start Page
10742
End Page
10749
Citation
Nano Letters 24 (35): 10742-10749 (2024)
Publisher DOI
Scopus ID
Publisher
ACS Publ.
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.
Subjects
Active metasurfaces
bound states in the continuum
loss tunability
near-field tunability
vanadium dioxide
DDC Class
600: Technology