Figure 1

(a) Photoluminescence spectra of the studied MC structure at $T=5\text{K}$ for cw–low power excitation (${\lambda }_{\text{las}}=352\text{nm}$; $100\text{W}/{\text{cm}}^2$). The dashed and solid vertical arrows indicate the energies of the uncoupled states (MC photon mode and QW exciton) and polariton resonances (LP and UP), respectively. The inset shows PL spectra for different temperatures $T=5–120\text{K}$. At $T=50\text{K}$ the minimum-energy separation between the PL lines which is equal to 3.3 meV is reached corresponding to the Rabi splitting. (b) Calculated energies of low and upper polariton branches as a function of detuning between the photon mode and the QW exciton for a Rabi splitting of 3.3 meV at $T=1.8\text{K}$. The dashed lines are the resonance energies of the MC photon mode and QW exciton. (c) Dependence of the lower polariton emission intensity on detuning determined from the temperature dependence of the PL spectra. Vertical dotted line in panels (b) and (c) shows the detuning at $T=1.8\text{K}$ in the absence of a strain pulse. The upper scale in panel (b) is given to show the correspondence between the strain in the QW and the strain-induced variation in detuning $E_{\text{QW}}-E_{\text{MC}}$.Reuse & Permissions

Figure 2

(Color online) (a) Scheme of experiment with picosecond strain pulses. (b) Calculated temporal shape of a strain pulse at the interface between substrate and Bragg mirror.Reuse & Permissions

Figure 3

(Color online) Streak-camera images of the temporal (vertical direction) and spectral (horizontal direction) PL evolutions in the (a) absence and (b) presence of a strain pulse at $T=1.8\text{K}$. The big horizontal arrows show times, which correspond to the pulse excitation of the PL [panel (a)] and injection of a strain pulse into MC [panel (b)]. Panels (c) and (d) demonstrate spectral profiles at time delays shown in (a) and (b) by numbered arrows in (c) absence and (d) presence of a strain pulse.Reuse & Permissions

Figure 4

Temporal evolution of the LP line at $T=1.8\text{K}$: (a) energy shift, (b) spectral width, and (c) integral PL intensity of LP line normalized to the spectral width and integral intensity in the absence of a strain pulse. The inset shows the temporal evolution of the PL energy measured for various time delays $\mathit{\Delta }t$, between the pulses for PL excitation and strain pulse injection. The step between the delays is 100 ps. The upper curve corresponds to the shortest delay when the arrival of the strain pulse at the QW coincides with the maximum PL intensity. For better comparison the time scales have been shifted by the corresponding delay so that the curves lie on top of each other.Reuse & Permissions