Fig. 5: Double pulse control of PE timing.
From: Accurate photon echo timing by optical freezing of exciton dephasing and rephasing in quantum dots
Numerical simulation of PEs calculated using the optical Bloch equations. The first and second pulses are depicted by the electric field amplitudes \({{\mathcal{E}}}_{1}\) and \({{\mathcal{E}}}_{2}\), and excite the quantum dots at t = 0 and 80 ps, respectively. The three PEs in all panels result from a different control pulse sequences: (i) no control pulse, (ii) the single control pulse with amplitude \({{\mathcal{E}}}_{{\rm{C,1}}}\), and (iii) two control pulses with amplitudes \({{\mathcal{E}}}_{{\rm{C,1}}}\) and \({{\mathcal{E}}}_{{\rm{C,2}}}\) are considered. The control pulses \({{\mathcal{E}}}_{{\rm{C,1}}}\) and \({{\mathcal{E}}}_{{\rm{C,2}}}\) are positioned at (a) t = 33 and 45 ps (two pre-pulses), (b) t = 103 and 115 ps (two post-pulses), and (c) t = 50 and 140 ps (one pre-pulse and one post-pulse), respectively. For all simulations, Θ1 = π/2, Θ2 = π, and ΘC,1 = ΘC,2 = 2π.
