biostudies-literatureAigner ADeutsche ForschungsgemeinschaftEuropean Research CouncilSolar Technologies go HybridMinisterstvo ?kolstv?, Ml?de?e a Telov?chovyImperial College LondonHORIZON EUROPE European Innovation CouncilGrantov? Agentura Cesk? RepublikyCenter for NanoScience, Ludwig-Maximilians-Universit?t M?nchenEngineering and Physical Sciences Research Council10742-10749https://www.ebi.ac.uk/biostudies/studies/S-EPMC11389864biostudies-literatureUnknown24(35)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 charaNano lettersEngineering of Active and Passive Loss in High-Quality-Factor Vanadium Dioxide-Based BIC Metasurfaces.PMC11389864101078018EP/W017075/1TI 1063/1EXC 2089/1 390776260CZ.02.01.01/00/22_008/0004572 QM4ST10104632921-29468SLigmajer FHolobradek JAigner ATittl AMaier SARovenska KIdesova Bde S Menezes LfalseEngineering of Active and Passive Loss in High-Quality-Factor Vanadium Dioxide-Based BIC Metasurfaces.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 chara2024-01-01T00:00:00Z2024 Sep2025-04-18T13:38:48.445Z2025-04-04T11:34:07.474ZS-EPMC113898643919139810.1021/acs.nanolett.4c01703