Fig. 1. Schematic of the NSA-induced superresolution spot effect.

Fig. 2. Experimental setup. 1, signal generator; 2, BVL; 3, splitter (9∶1); 4, lens; 5, HPD; 6, 1/2 WP for BVL; 7, PBS for BVL; 8, 1/4 WP for BVL; 9, RL laser; 10, 1/2 WP for RL; 11, PBS for RL; 12, 1/4 WP for RL; 13, dichroic beam splitter; 14, beam expander; 15, reflector; 16, OL for focusing; 17, sample stage; 18, sample; 19, OL for collecting signal; 20, filter for RL; 21, splitter (5∶5); 22, lens; 23, HPD; 24, lens; 25, ICCD; 26, lens; 27, HPD.

Fig. 3. Reversible characteristics of the optical pinhole channel.

Fig. 4. Time response of a single pump-pulse-induced optical pinhole channel (pump pulse width of 80 ns, power of 20 mW).

Fig. 5. Transmitted transient probe spots at delay times of (a) 0, (b) 60, (c) 80, (d) 120, and (e) 200 ns, respectively corresponding to letters A, B, C, D, and E in Fig. 4.

Fig. 6. Transient superresolution probe spot. (a) The initial transient spot without the pump pulse excitation, (b) the transient superresolution spot captured at a delay time of 40 ns after the pump pulse excitation, (c) the comparison of the normalized intensity profiles of (a) and (b).