[10p-B11-1~17] 3.10 Photonic structures and phenomena

2:45 PM - 3:00 PM JST(5:45 AM - 6:00 AM UTC)

[10p-B11-5] High Q-factor nanowire WGM resonators based on bound state in the continuum

〇Xuejun Xu¹, Guoqiang Zhang^1,2, Masato Takiguchi^1,2, Hideki Gotoh^1,3, Haruki Sanada¹ (1.NTT BRL, 2.NTT NPC, 3.Hiroshima Univ.)

Keywords:

nanowire,whispering-gallery mode,bound state in the continuum

Semiconductor nanowire lasers have attracted considerable attention as miniaturized, energy-efficient on-chip light sources for communication and sensing applications. Recently, we demonstrated room-temperature telecom-band nanowire lasers with low thresholds and narrow linewidths based on whispering-gallery-mode (WGM) resonators formed in individual InP/InAs multi-quantum-disk (MQD) heterostructure nanowires. To further reduce the lasing threshold and enable continuous-wave operation, significant enhancement of the resonator Q factor is required, particularly for transverse-electric (TE)-polarized WGMs (with majority E-field in-plane) that experience the highest optical gain. Here, we identify the key parameters governing the Q factor and propose a design strategy based on bound states in the continuum (BICs).