Bound states in the continuum facilitated two-photon pumped vortex laser in perovskite light-emitting metasurface

Chi-Ching Liu^1,2*, Hui-Hsin Hsiao³, Yun-Chorng Chang^1,2

¹Department of Physics, National Taiwan University, Taipei, Taiwan
²Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan
³Department of Engineering Science and Ocean Engineering, National Taiwan University, Taipei, Taiwan

* Presenter:Chi-Ching Liu, email:d07222017@ntu.edu.tw

We experimentally observe two-photon pumped vortex lasing from perovskite light-emitting metasurface under below band-gap excitation. The vortex laser with quality factor and threshold at around 1100 and 4.5 mJ/cm² is achieved at room temperature. By theoretical analysis, we find out the lasing originated from symmetry-protected bound states in the continuum (BIC) with topological charge q = +1 result in magnetic dipole resonances of perovskite nanoantennas in phase. We believe our result pave the way to more complex and ultrafast modulation of vortex lasing beam.

Keywords: bound states in the continuum, perovskite, light-emitting metasurfaces, nanolasers