Resonant photoluminescence from Ge microdisks on Ge-on-insulator

Abstract

Well-resolved resonant PL peaks were observed from microdisks fabricated on heavily n-doped GOI. FSR and Q-factor confirmed that these peaks corresponded to the WGMs of microdisk. Q-factors didn't decrease against pump power, indicating the onset of population inversion. Our results show that GOI is a promising platform to realize lasers.