Fig. 6. Time-dependence of the tip displacement for the crystals of 1a (black square) and 2a (red square) upon irradiation with 365 nm light. The sizes of the rectangular plate crystals were as follows: 1a (length: 0.56 mm and thickness: 7.4 μm); 2a (length: 0.48 mm and thickness: 7.9 μm). A high-speed camera (Keyence, VW-6000) was used to follow the rapid response in the initial 50 ms.
