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Breaking Acoustic Limit of Optical Focusing Using Photoacoustic‐Guided Wavefront Shaping
Author(s) -
Gao Rongkang,
Xu Zhiqiang,
Song Liang,
Liu Chengbo
Publication year - 2021
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.202000594
Subject(s) - wavefront , opacity , focus (optics) , optics , computer science , light scattering , transducer , limit (mathematics) , scattering , acoustics , physics , mathematics , mathematical analysis
Optical wavefront shaping (WFS) has been demonstrated as a powerful tool for focusing light in opaque scattering media. Photoacoustic (PA)‐guided WFS, in particular, has raised a lot of interest because of its non‐invasive approach of light focusing by utilizing endogenous optical absorption information inside complex samples. In general, the optical focus after PA‐guided WFS is limited by the focus of the ultrasound transducer. To date, a number of approaches have been developed to tackle this problem, allowing a sub‐acoustic focal spot to be achieved deep within scattering samples. This review introduces these developments in PA‐guided WFS, highlighting their fundamental principles as well as their merits and limitations. Furthermore, the rules that govern the optical focusing ability of PA‐guided WFS are provided, and the outlook and remaining challenges for future advances are discussed. These insights will facilitate further breakthroughs in PA‐guided WFS.