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. Author manuscript; available in PMC: 2020 Feb 12.
Published in final edited form as: J Opt. 2019 Sep 9;21(10):10.1088/2040-8986/ab3b1a. doi: 10.1088/2040-8986/ab3b1a

Figure 2.

Figure 2.

Photoacoustic microscopy with sub-diffraction resolutions. (a) Melanin distribution imaged by two-photon PAM (2PA) (top) and one-photon PAM (1PA) (bottom) (1). (b) Mitochondria imaged by PA nanoscopy based on optical absorption saturation (2). (c) Red blood cells imaged by Grüneisen-relaxation-based PAM (GR-PAM) (top) at three different depths (3). (d) Reversibly-switchable PAM (RS-PAM) (right) has superior resolution on bacteria (left) (6). (e) Nanoparticles imaged by photobleaching-based PAM (PI-PAM) (right) (7).