Fig. 4: Multi-focus generation and control with light.
A The spatially modulated light intensity pattern projected on the photoresistive elements to generate one (i), two (ii) and three (iii) acoustic foci. B The electrical phase shift (Δϕ) measured with respect to the input signal (Vi) driving the transducer elements and controlled by the projected light intensity (IL). C The experimentally measured ultrasound pressure amplitude determined 50 mm from the surface of transducer array. D The corresponding numerically simulated amplitude based on the mapped electrical phase shifts. The scale bar is 5 mm.
