期刊
LIGHT-SCIENCE & APPLICATIONS
卷 10, 期 1, 页码 -出版社
SPRINGERNATURE
DOI: 10.1038/s41377-021-00591-w
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资金
- Shanghai Municipal of Science and Technology Project [20JC1419500]
- Foundation of National Facility for Translational Medicine (Shanghai) [TMSK-2020-129]
- Shanghai Pujiang Program [20PJ1408700]
- National Natural Science Foundation of China [62005007]
- Fundamental Research Funds for the Central Universities (Beihang University)
The antiscattering light focusing by wavefront shaping relies on speed and enhancement, and the digital-micromirror device (DMD) is a potential solution due to its high pattern rate and modulation modes. However, binary modulation by DMD restricts speed and enhancement. A multi-pixel encoded DMD-based method was proposed to overcome this limitation and increase optimization speed and focus enhancement significantly.
Speed and enhancement are the two most important metrics for anti-scattering light focusing by wavefront shaping (WS), which requires a spatial light modulator with a large number of modulation modes and a fast speed of response. Among the commercial modulators, the digital-micromirror device (DMD) is the sole solution providing millions of modulation modes and a pattern rate higher than 20 kHz. Thus, it has the potential to accelerate the process of anti-scattering light focusing with a high enhancement. Nevertheless, modulating light in a binary mode by the DMD restricts both the speed and enhancement seriously. Here, we propose a multi-pixel encoded DMD-based WS method by combining multiple micromirrors into a single modulation unit to overcome the drawbacks of binary modulation. In addition, to efficiently optimize the wavefront, we adopted separable natural evolution strategies (SNES), which could carry out a global search against a noisy environment. Compared with the state-of-the-art DMD-based WS method, the proposed method increased the speed of optimization and enhancement of focus by a factor of 179 and 16, respectively. In our demonstration, we achieved 10 foci with homogeneous brightness at a high speed and formed W- and S-shape patterns against the scattering medium. The experimental results suggest that the proposed method will pave a new avenue for WS in the applications of biomedical imaging, photon therapy, optogenetics, dynamic holographic display, etc.
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