Bismuth-based gap-plasmon metasurfaces for visible photonics with volatile tuning potential - De Galarreta CR; Nieto-Pinero E; Garcia-Pardo M; Wright CD; Serna R; Toudert J (2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021, 2021)