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Title: Swiftly moving focus points and forming shapes through the scattering media
Authors: Tran, Vinh
Sahoo, Sujit Kumar
Tang, Dongliang
Dang, Cuong
Keywords: Optical Memory Effect
Spatial Light Modulator
Issue Date: 2018
Source: Tran, V., Sahoo, S. K., Tang, D., & Dang, C. (2018). Swiftly moving focus points and forming shapes through the scattering media. Proceedings of SPIE - Adaptive Optics and Wavefront Control for Biological Systems IV, 10502, 105020N-.
Abstract: Propagation of light through scattering media such as ground glass or biological tissue limits the quality and intensity of focusing point. Wave front shaping technique which uses spatial light modulator (SLM) devices to reshape the field profile of incoming light, is considered as one of the most effective and convenient methods. Advanced biomedical or manufacturing applications require drawing various contours or shapes quickly and precisely. However, creating each shape behind the scattering medium needs different phase profiles, which are time consuming to optimize or measure. Here, we demonstrate a technique to draw various shapes or contours behind the scattering medium by swiftly moving the focus point without any mechanical movements. Our technique relies on the existence of speckle correlation property in scattering media, also known as optical memory effect. In our procedure, we first modulate the phase-only SLM to create the focus point on the other side of scattering medium. Then, we digitally shift the preoptimized phase profile on the SLM and ramp it to tilt the beam accordingly. Now, the incoming beam with identical phase profile shines on the same scattering region at a tilted angle to regenerate the focus point at the desired position due to memory effect. Moreover, with linear combination of different field patterns, we can generate a single phase profile on SLM to produce two, three or more focus points simultaneously on the other side of a turbid medium. Our method could provide a useful tool for prominent applications such as opto-genetic excitation, minimally invasive laser surgery and other related fields.
DOI: 10.1117/12.2289747
Rights: © 2018 SPIE. This paper was published in Proceedings of SPIE - Adaptive Optics and Wavefront Control for Biological Systems IV and is made available as an electronic reprint (preprint) with permission of SPIE. The published version is available at []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Conference Papers

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