Takiguchi Masato, Taniyama Hideaki, Sumikura Hisashi, Birowosuto Muhammad Danang, Kuramochi Eiichi, Shinya Akihiko, Sato Tomonari, Takeda Koji, Matsuo Shinji, Notomi Masaya
Opt Express. 2016 Feb 22;24(4):3441-50. doi: 10.1364/OE.24.003441.
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.
掩埋式多量子阱（MQW）二维光子晶体腔（PhC）实现了低非辐射复合和高载流子限制，因此使其成为高效发光体。在本研究中，我们研究了高β（自发发射耦合因子）掩埋式MQW光子晶体纳米腔激光器的激光特性，以阐明理论预测的高β纳米激光器无阈值运转。我们纳米激光器中强光和载流子限制以及低非辐射复合，使我们能够根据输入光与输出光曲线以及腔线宽清晰地展示非常平滑的激光跃迁。为了阐明无阈值激光行为，我们进行了寿命测量和光子关联测量，这也证实了预测的行为。此外，我们系统地研究了β对失谐频率的依赖性，这与基于时域有限差分法的数值模拟结果吻合良好。这是对接近无阈值状态的基于MQW的纳米激光器的首次有说服力的系统研究。
