Lasing emission from guided mode-assisted quasi-bound states in the continuum in all-dielectric metasurfaces

We demonstrated lasing action in quasi-BIC all-dielectric metasurfaces integrated with a slab waveguide containing laser dyes. Our system offers both single and multimode lasing emission directed toward true zeroth-order and oblique angles with the ability for passive tunability of the emission wavelength within the spectral range of the gain medium.