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(a) The basic optical setup for BISTRO measurements. CL: cylindrical lens; SL: spherical lens; TG: transmission grating; OL: objective lens; S: sample; f1 & f2: focal lengths for the spherical lens and the objective lens in the 4f system; (b) The geometric relationship between the objective lens and the micro-fluid channel; (c) The close-up illustration of the focal point. Gray arrows: the liquid flow; Blue arrows: the propagation direction of the stimulated acoustic wave.
