Feedback-based wavefront shaping based on light intensity distribution for focusing light through scattering media

Feedback-based wavefront shaping for focusing light through scattering media is an established method. In conventional feedback-based wavefront shaping, the incident light is divided into N input modes that are modulated by a spatial light modulator (SLM) using N segments, each of which has the same...

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Bibliographic Details
Published in:Journal of applied physics 2021-07, Vol.130 (3)
Main Authors: Tang, Shiyun, Tan, Wenjiang, Si, Jinhai, Li, Jing, Yang, Yang, Hou, Xun
Format: Article
Language:English
Subjects:
Applied physics
Feedback
Focusing
Genetic algorithms
Incident light
Light
Luminous intensity
Phase modulation
Pixels
Response time
Scattering
Spatial light modulators
Wave fronts
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Summary:Feedback-based wavefront shaping for focusing light through scattering media is an established method. In conventional feedback-based wavefront shaping, the incident light is divided into N input modes that are modulated by a spatial light modulator (SLM) using N segments, each of which has the same number and size of pixels. Here we propose light intensity-dependent feedback-based wavefront shaping using a genetic algorithm to achieve the desired wavefront shaping in less time and with fewer iterations than the conventional method. In our method, a phase mask is divided into several regions, each being allocated different phase modulation units according to the distribution of light intensity, with the pixels of the SLM being grouped non-uniformly to modulate the incident light. Compared with the conventional method, the experimental response time of our method using four subregions decreased by 15.6% and the enhancement factor increased by 30.4%.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0050779