Tawara T, Kamada H, Tanabe T, Sogawa T, Okamoto H, Yao P, Pathak P K, Hughes S
NTT Basic Research Labs, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
Opt Express. 2010 Feb 1;18(3):2719-28. doi: 10.1364/OE.18.002719.
The photoluminescence spectra from a quantum-dot exciton weakly-coupled to a planar photonic-crystal cavity is experimentally investigated by temperature tuning. Significant resonance shifts of the cavity mode are observed as the cavity mode spectrally approaches that of the exciton mode, showing the appearance of cavity-to-exciton attraction or mode pulling. Cavity-mode spectral shifts are also found theoretically using a master equation model that includes incoherent pump processes for the coupled exciton and cavity, pure dephasing, and allows for photon emission via radiation modes and the leaky cavity mode. Both experiments and theory show clear cavity mode spectral shifts in the photoluminescence spectra, when certain coupling parameters are met. However, discrepancies between the experimental data and theory, including more pronounced spectral shifts in the measurements, indicate that other unknown mode-pulling effects may also be occurring.
通过温度调谐对与平面光子晶体腔弱耦合的量子点激子的光致发光光谱进行了实验研究。当腔模在光谱上接近激子模时，观察到腔模有明显的共振位移，这表明出现了腔到激子的吸引或模式牵引。理论上还使用主方程模型发现了腔模光谱位移，该模型包括耦合激子和腔的非相干泵浦过程、纯退相，并允许通过辐射模式和泄漏腔模进行光子发射。当满足某些耦合参数时，实验和理论均表明光致发光光谱中存在明显的腔模光谱位移。然而，实验数据与理论之间的差异，包括测量中更明显的光谱位移，表明可能还存在其他未知的模式牵引效应。
