title: Systematic study of thresholdless oscillation in high-β buried multiple-quantum-well photonic crystal nanocavity lasers.
abstract: Buried multiple-quantum-well (MQW) 2D photonic crystal cavities (PhC) achieve low non-radiative recombination and high carrier confinement thus making them highly efficient emitters. In this study, we have investigated the lasing characteristics of high-β(spontaneous emission coupling factor) buried MQW photonic crystal nanocavity lasers to clarify the theoretically-predicted thresholdless operation in high-β nanolasers. The strong light and carrier confinement and low non-radiative recombination in our nanolasers have enabled us to clearly demonstrate very smooth lasing transition in terms of the light-in vs light-out curve and cavity linewidth. To clarify the thresholdless lasing behavior, we carried out a lifetime measurement and a photon correlation measurement, which also confirmed the predicted behavior. In addition, we systematically investigated the dependence of β on the detuning frequency, which was in good agreement with a numerical simulation based on the finite-difference time-domain method. This is the first convincing systematic study of nanolasers based on an MQW close to the thresholdless regime.
authors.forename: Masato
authors.initials: M
authors.lastname: Takiguchi
authors.forename: Hideaki
authors.initials: H
authors.lastname: Taniyama
authors.forename: Hisashi
authors.initials: H
authors.lastname: Sumikura
authors.forename: Muhammad Danang
authors.initials: MD
authors.lastname: Birowosuto
authors.forename: Eiichi
authors.initials: E
authors.lastname: Kuramochi
authors.forename: Akihiko
authors.initials: A
authors.lastname: Shinya
authors.forename: Tomonari
authors.initials: T
authors.lastname: Sato
authors.forename: Koji
authors.initials: K
authors.lastname: Takeda
authors.forename: Shinji
authors.initials: S
authors.lastname: Matsuo
authors.forename: Masaya
authors.initials: M
authors.lastname: Notomi