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Anti-scattering light focusing by fast wavefront shaping based on multi-pixel encoded digital-micromirror device
Jiamiao Yang1,2, Qiaozhi He1, Linxian Liu3,4
1Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China.
Light, Science & Applications
|July 21, 2021
Summary
This study introduces a novel multi-pixel encoded digital micromirror device (DMD) method for wavefront shaping (WS). This technique significantly enhances light focusing speed and intensity, overcoming limitations of traditional binary modulation for anti-scattering applications.
Area of Science:
- Optics and Photonics
- Biomedical Engineering
- Computational Physics
Background:
- Wavefront shaping (WS) is crucial for anti-scattering light focusing, demanding high modulation modes and fast response times.
- Digital micromirror devices (DMDs) offer millions of modulation modes and high pattern rates (>20 kHz), making them promising for WS.
- Binary modulation by DMDs limits both speed and enhancement in anti-scattering light focusing.
Purpose of the Study:
- To develop an improved DMD-based wavefront shaping method for enhanced anti-scattering light focusing.
- To overcome the speed and enhancement limitations imposed by binary modulation in DMDs.
- To accelerate optimization and improve focus enhancement for practical applications.
Main Methods:
- Proposed a multi-pixel encoded DMD-based WS method, combining micromirrors into single modulation units.
- Employed separable natural evolution strategies (SNES) for efficient wavefront optimization in noisy environments.
- Demonstrated focusing through scattering media with high enhancement and speed.
Main Results:
- Achieved a 179-fold increase in optimization speed and a 16-fold enhancement in focus intensity compared to state-of-the-art methods.
- Successfully generated 10 foci with homogeneous brightness at high speed.
- Created complex light patterns (W- and S-shapes) through scattering media.
Conclusions:
- The multi-pixel encoded DMD-WS method significantly boosts speed and enhancement for anti-scattering light focusing.
- This approach overcomes binary modulation limitations, enabling high-performance WS.
- The method holds potential for advancing biomedical imaging, photon therapy, optogenetics, and holographic displays.
