Fig. 3: X⁻¹ switching under two-colour dual excitation.

a Schematic representation of the two-colour dual-excitation switching proposal. Here the 830 nm continuous wave (cw) laser (Laser 1 shown in blue) is used as the switcher input channel and the 790 nm pulsed laser (Laser 2 in red) for the control, as before. b μ-Photoluminescence spectrum acquisition under 790 nm pulsed excitation (red line), under 830 nm cw excitation (blue line), and with both lasers (black line). c Time resolved photoluminescence with same excitation conditions in b, for the X⁻¹ transition (in blue) and the X⁰ transition (in red). d Evolution of the selective pumping efficiency (Δr) as a function of time. e Experimental time resolved photoluminescence under 830 nm cw and 790 nm pulsed laser excitation. cw laser mean power is increased from 10 μW (orange lines) to 300 μW (blue lines). Intermediate powers (40, 85, 120 and 190 μW) are represented with grey lines. The mean power of the pulsed laser increases from the bottom panels to the top panels, corresponding to 1, 3, 6 and 8.5 μW (top panels). f Model simulation for the same parameters in e.