Fig. 3: A chirality all-optical switch.
a The truth table of an XOR gate. When control is co-circular to the signal, a decrease in the reflected signal is defined as “0” output. When control is cross-circular to the signal, an increase in the reflected signal is defined as “1” output. b Left axis: The modulation amplitude of the probe reflectance by a 120 fJ/μm2 (2 pJ) pump at zero time delay: dR± = R±(on) − R±(off), where ± denotes the co- (blue) and cross-circularly (red) polarized probe. Right axis: The corresponding extinction ratio Θ = 10log10(∣dR+ − dR−∣/δ) (green). c Time-dependence of the modulation amplitudes for the co- (blue) and cross-polarized (red) probe and the corresponding extinction ratio Θ (green) at E = 1.75 eV, showing an ultrafast switch time of about 0.4 ps, reflecting the coherent nature of the Floquet effect.
