期刊
LASER & PHOTONICS REVIEWS
卷 16, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202200296
关键词
near-field imaging; photoacoustic; photoacoustic microscopy; shear-force detection
资金
- National Research Foundation of Korea (NRF) - Ministry of Education [2020R1A6A1A03047902]
- Ministry of Science and ICT [NRF-2019R1A2C2006269, 2021M3C1C3097624, NRF-2022M3C1A3081312, CAMM-2019M3A6B3030637]
- Korea Medical Device Development Fund - Korean Government (the Ministry of Trade, Industry and Energy) [9991007019, KMDF_PR_20200901_0008]
- Korea Institute for Advancement of Technology (KIAT) - Korea Government(MOTIE) [P0008763]
- BK21 FOUR Projects
This study demonstrates a proof-of-concept of super-resolution, near-field scanning photoacoustic microscopy using a lens-free, shear-force photoacoustic microscopy system with a tapered fiber. By attaching an uncoated tapered fiber to a quartz tuning fork and maintaining the near-field distance between the fiber and sample surface via a shear-force detection mechanism, targets are imaged with high lateral resolutions.
Optical-resolution photoacoustic microscopy (OR-PAM) enables both high-resolution and high-contrast imaging of optical chromophores ranging from biological tissues to inorganic samples. The lateral spatial resolution of OR-PAM depends on its optical configuration and is primarily determined by the numerical aperture of the objective lens. This study demonstrates a novel, lens-free, shear-force photoacoustic microscopy system using a tapered fiber, serving as a proof-of-concept toward the implementation of super-resolution, near-field scanning photoacoustic microscopy. An uncoated tapered fiber is attached to a quartz tuning fork, thereby maintaining the near-field distance between the fiber and sample surface via a shear-force detection mechanism. Light-field simulation confirms an evanescent wave at the end of the uncoated, tapered fiber. Based on the photoacoustic simulation and 2D photoacoustic scanning experimental results, targets are imaged with high-lateral resolutions of the order of 1.0 +/- 0.3 mu m. These results demonstrate the existence of near-field photoacoustic signals and the potential for future development of super-resolution, near-field, scanning photoacoustic microscopy.
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