We study spontaneous emission control and lasing oscillation of embedded multiple quantum well (MQW)
in InP photonic crystal nanocavities. We observed large emission rate ratio between the on- and off-resonant
conditions (30:1). This is the highest ratio reported for MQW nano-laser[Takiguchi, et. al., APL 2013] .
By adopting high β embedded multiple quantum well photonic crystal nanocavities, we have also demonstrated
smooth-lasing transition, which indicates thresholdless-like lasing theoretically predicted, by mean of L-L curve
analysis, linewidth analysis, and photon correlation measurements[Takiguchi, et. al., OE 2016].