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. Author manuscript; available in PMC: 2017 Sep 15.
Published in final edited form as: Trends Biotechnol. 2016 Feb 26;34(5):420–433. doi: 10.1016/j.tibtech.2016.02.001

Figure 2. PAM embodiments and wavefront engineering.

Figure 2

(A) Schematic of OR-PAM, where fast scanning is achieved by a MEMS mirror [7]. (B) Schematic of AR-PAM [6]. (C) Concept of TROVE focusing. In TROVE imaging, multiple randomized input wavefronts are frequency-shifted, decoded and time reversed [15]. (D) Gaussian-shape based PA signals to guide wavefront optimization [18]. Abbreviations: PAM (photoacoustic microscopy); OR-PAM (optical-resolution photoacoustic microscopy); OAC (optical-acoustic combiner); PBS (polarizing beam splitter); UT (ultrasonic transducer); MEMS (microelectromechanical scanner); AR-PAM (acoustic-resolution photoacoustic microscopy); TROVE (time reversal of variance encoded light).