Mikheeva, ElenaKoshelev, KirillChoi, Duk-YongKruk, SergeyLumeau, JulienAbdeddaim, RedhaVoznyuk, IvanEnoch, StefanKivshar, Yuri2020-07-012020-07-01http://hdl.handle.net/1885/205702We study, both theoretically and experimentally, tunable metasurfaces supporting sharp Fano-resonances inspired by optical bound states in the continuum. We explore the use of arsenic trisulfide (a photosensitive chalcogenide glass) having optical properties which can be finely tuned by light absorption at the post-fabrication stage. We select the resonant wavelength of the metasurface corresponding to the energy below the arsenic trisulfide bandgap, and experimentally control the resonance spectral position via exposure to the light of energies above the bandgap.K.K. was supported by the Ministry of Education and Science of the Russian Federation (grant no. 3.1668.2017/4.6), the Grant of the President of the Russian Federation (MK-403.2018.2) and the Foundation for the Advancement of Theoretical Physics and Mathematics BASIS. Y.K. acknowledges financial support from the Australian Research Council and the Strategic Fund of the Australian National University.7 pagesapplication/pdfen-AU© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. https://www.osapublishing.org/submit/review/copyright_permissions.cfm#posting Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved (Publisher journal website as of 1/7/2020).2019-11-0510.1364/OE.27.0338472020-01-27