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Motionless SIR-PAM vs. conventional OR-PAM. (a) The concept and the measured lateral resolution, RIAR, and DoF (b) Volume-rendered images of carbon fibers. PAM, photoacoustic microscopy; SIR-PAM, spatially invariant resolution PAM; OR-PAM, optical-resolution PAM; E1 and E2, symmetrical plane waves of the propagation-invariant sinusoidal fringes; RIAR, resolution-invariant axial range; and DoF, depth of field. Reproduced with permission from Ref. [70].
