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Proceedings Paper

Focusing light through strongly scattering media by controlling binary amplitude optimization using genetic algorithm
Author(s): Zhipeng Liu; Bin Zhang; Qi Feng; Zhaoyang Chen; Chengyou Lin; Yingchun Ding
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Paper Abstract

Focusing light through strongly scattering media plays an important role in biomedical imaging and therapy. Here, we experimentally demonstrate light focusing through ZnO sample by controlling binary amplitude optimization using genetic algorithm. In the experiment, we use a Micro Electro-Mechanical System (MEMS)-based digital micromirror device (DMD) which is in amplitude-only modulation mode. The DMD consists of 1920×1080 square mirrors that can be independently controlled to reflect light to a desired position. We control only 160 thousand mirrors which are divided into 400 segments to modulate light focusing through the scattering media using advanced genetic algorithm. Light intensity at the target position is enhanced up to 50±5 times the average speckle intensity. The diameters of focusing spot can be changed ranging from 7 μm to 70 μm at arbitrary positions and multiple foci are obtained simultaneously. The spatial arrangement of multiple foci can be flexibly controlled. The advantage of DMDs lies in their switching speed up to 30 kHz, which has the potential to generate a focus in an ultra-short period of time. Our work provides a reference for the study of high speed wavefront shaping that is required in vivo tissues imaging.

Paper Details

Date Published: 13 June 2017
PDF: 7 pages
Proc. SPIE 10449, Fifth International Conference on Optical and Photonics Engineering, 1044927 (13 June 2017); doi: 10.1117/12.2270835
Show Author Affiliations
Zhipeng Liu, Beijing Univ. of Chemical Technology (China)
Bin Zhang, Beijing Univ. of Chemical Technology (China)
Qi Feng, Beijing Univ. of Chemical Technology (China)
Zhaoyang Chen, Beijing Univ. of Chemical Technology (China)
Chengyou Lin, Beijing Univ. of Chemical Technology (China)
Yingchun Ding, Beijing Univ. of Chemical Technology (China)


Published in SPIE Proceedings Vol. 10449:
Fifth International Conference on Optical and Photonics Engineering
Anand Krishna Asundi, Editor(s)

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