[1] [1] WISSMEYER G, PLEITEZ M A, ROSENTHAL A, et al. Looking at sound: optoacoustics with all-optical ultrasound detection[J]. Light Sci Appl, 2018, 7: 53. DOI: 10.1038/s41377-018-0036-7.

[2] [2] CHEN S L, GUO L J, WANG X. All-optical photoacoustic microscopy[J]. Photoacoustics, 2015, 3(4): 143-150. DOI: 10.1016/j.pacs.2015.11.001.

[3] [3] TARUTTIS A, NTZIACHRISTOS V. Advances in real-time multispectral optoacoustic imaging and its applications[J]. Nat Photonics, 2015, 9: 219-227. DOI: 10.1038/NPHOTON.2015.29.

[4] [4] HELL S W, WICHMANN J. Breaking the diffraction resolution limit by stimulated emission: stimulated-emission-depletion fluorescence microscopy[J]. Opt Lett, 1994, 19(11): 780-782. DOI: 10.1364/ol.19.000780.

[5] [5] PELLETT P A, SUN X L, GOULD T J, et al. Two-color STED microscopy in living cells[J]. Biomed Opt Express, 2011, 2(8): 2364-2371. DOI: 10.1364/BOE.2.002364.

[6] [6] HUANG D, SWANSON E A, LIN C P, et al. Optical coherence tomography[J]. Science, 1991, 254(5035): 1178-1181. DOI: 10.1126/science.1957169.

[7] [7] FERCHER A F, DREXLER W, HITZENBERGER C K, et al. Optical coherence tomography-principles and applications[J]. Rep Prog Phys, 2003, 66(2): 239-303. DOI: 10.1088/0034-4885/66/2/204.

[8] [8] MASLOV K, ZHANG H F, HU S, et al. Optical-resolution photoacoustic microscopy for in vivo imaging of single capillaries[J]. Opt Lett, 2008, 33(9): 929-931. DOI: 10.1364/OL.33.000929.

[9] [9] SONG W, ZHENG W, LIU R M, et al. Reflection-mode in vivo photoacoustic microscopy with subwavelength lateral resolution[J]. Biomed Opt Express, 2014, 5(12): 4235-4241. DOI: 10.1364/BOE.5.004235

[10] [10] YANG J M, GONG L, XU X, et al. Motionless volumetric photoacoustic microscopy with spatially invariant resolution[J]. Nat Commun, 2017, 8: 780. DOI: 10.1038/s41467-017-00856-2.

[11] [11] YANG X Q, JIANG B W, SONG X L, et al. Fast axial-scanning photoacoustic microscopy using tunable acoustic gradient lens[J]. Opt Express, 2017, 25(7): 7349-7357. DOI: 10.1364/OE.25.007349.

[12] [12] CHEN Q, GUO H, JIN T, et al. Ultracompact high-resolution photoacoustic microscopy[J]. Opt Lett, 2018, 43(7): 1615-1618. DOI: 10.1364/OL.43.001615.

[13] [13] YAO J J, WANG L V. Photoacoustic microscopy[J]. Laser Photonics Rev, 2013, 7(5): 758-778. DOI: 10.1002/lpor.201200060.

[15] [15] XIA J, YAO J J, WANG L V. Photoacoustic tomography: principles and advances[J]. Electromagn Waves (Camb), 2014, 147: 1-22. DOI: 10.2528/PIER14032303.

[16] [16] ZHANG C, MASLOV K, WANG L V. Subwavelength-resolution label-free photoacoustic microscopy of optical absorption in vivo[J]. Opt Lett, 2010, 35(19): 3195-3197. DOI: 10.1364/OL.35.003195.

[17] [17] SHI J H, WANGL D, NOORDAM C, et al. Bessel-beam Grueneisen relaxation photoacoustic microscopy with extended depth of field[J]. J Biomed Opt, 2015, 20(11): 11602. DOI: 10.1117/1.JBO.20.11.116002.

[18] [18] LIN L, ZHANG P, XU S, et al. Handheld optical-resolution photoacoustic microscopy[J]. J Biomed Opt, 2016, 22(4): 041002. DOI: 10.1117/1.JBO.22.4.041002.

[19] [19] ZHAO X, SONG Z, LI Y J, et al. High efficiency sub-nanosecond electro-optical Q-switched laser operating at kilohertz repetition frequency[J]. Chin Phys B, 2020, 29(8): 084205. DOI: 10.1088/1674-1056/ab8ac4.

[20] [20] GALANZHA E I, MENYAEV Y A, YADEM A C, et al. In vivo liquid biopsy using Cytophone platform for photoacoustic detection of circulating tumor cells in patients with melanoma[J]. Sci Transl Med, 2019, 11: eaat5857. DOI: 10.1126/scitranslmed.aat5857

[21] [21] XIE Z X, JIAO S L, ZHANG H F, et al. Laser-scanning optical-resolution photoacoustic microscopy[J]. Opt Lett, 2009, 34(12): 1771-1773. DOI: 10.1364/OL.34.001771.

[22] [22] MOOTHANCHERY M, BI R, KIM J Y, et al. Optical resolution photoacoustic microscopy based on multimode fibers[J]. Biomed Opt Express, 2018, 9(3): 1190-1197. DOI: 10.1364/BOE.9.001190.