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(Color online) [(a) and (b)] Linear reflection (light shading) of the spin-down and spin-up stopgaps, respectively. Dark shading in (a) shows the spectral position of the control used for switching measurements. Spectral shape of the signal is shown by the blue solid line. Inset in (a) shows the temporally resolved signal (blue line) and control (dark shaded) pulses with an gating pulse. (c) The experimental configuration used for switching measurements. The control (red, solid) is strong , right circularly polarized , and spectrally narrowed to . The signal beam (blue, dashed) is linearly polarized and spectrally narrowed to .
(Color online) Simulated reflection (black), absorption (blue), and transmission (red) from a BSQW with two different exciton dephasing rates ( solid, dashed) (see Ref. 13).
(Color online) [(a)–(d)] Reflection of a broadband, polarized probe pulse (, ) as a function of pump spectral position (dark shaded area, , ). Reflection was measured at pump-probe delays of (light shading), , (red, solid), and (blue, dashed) in each case.
(Color online) (a) Maximum recorded contrast ratio (solid circles) and throughput (hollow squares) as a function of center signal frequency. Linear reflection from the BSQW is shown in light shading. (b) Measured contrast ratio vs control-signal time delay (blue, solid) and control fluence (c) at the spectral position showing maximum contrast ratio in (a). The dotted line in (b) indicates a contrast ratio of 1 (switch off). Control-signal cross correlation is shown in (b) for reference (black, dashed). The inset in (b) shows the contrast ratio plotted on a logarithmic scale. (c) also lists the corresponding throughput for each control fluence.
(Color online) Differential reflection vs pump-probe time delay for the spectrally narrow probe pulse shown in Fig. 2(a). Probe with the same (opposite) circular polarization as the pump is shown in part (a) [part (b)].
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