High-quality laser cavity based on all-dielectric metasurfaces

Ultra-high Q-factor toroidal dipole resonance and magnetic dipole quasi-bound state in the continuum in an all-dielectric hollow metasurface

“…In 2014, Yang et al experimentally exposed an all-dielectric metasurface based on silicon, and a Q-factor of 483 is obtained [13]. In 2017, Nishant Shankhwar et al proposed a metasurface made by a periodic arrangement of silicon cylindrical particles, and the Q-factor can reach 2630 [17]. Another all-dielectric metasurface was demonstrated by Wang et al, using theta-shaped dielectric arrays with Q-factor up to 720 [18].…”

Compact Unidirectional Laser Based on All-Dielectric Metasurface With High Quality Factor

“…Controlling light emission by enhanced light-matter interactions in nanostructures has been intensively investigated in regimes of sensing [1][2][3], quantum information devices [4,5], efficiency enhanced solar cell [6][7][8][9], and lasers [10][11][12] owing to the strong localization of electromagnetic fields and long interaction times. Meanwhile, miniaturized nanoemitters and nanolasers are an emerging platform for manipulating light for quantum photonics.…”

“…Alternatively, using all-dielectric nanostructures is a promising way to overcome the dissipative losses in plasmonic ones. Recently, by coupling the gain medium with the collective resonance of all-dielectric metamaterials or by placing the gain medium in the nanogap of all-dielectric nanoparticles, emission intensity enhancement and significantly low lasing threshold have been experimentally achieved [21][22][23][24][25]. All-dielectric systems can provide high Q-factor modes with negligible loss, on the minus side, their size cannot go subwavelength due to the relatively low refractive index in the optical frequency range, and the strong radiation loss due to the "bright" mode also needs to overcome.…”