Continuous amplified digital optical phase conjugator for focusing through thick, heavy scattering medium

Yeh Wei Yu; Ching Cherng Sun; Xing Chen Liu; Wei Hsin Chen; Szu Yu Chen; Yu Heng Chen; Chih Shun Ho; Che Chu Lin; Tsung Hsun Yang; Po Kai Hsieh

doi:10.1364/OSAC.2.000703

Continuous amplified digital optical phase conjugator for focusing through thick, heavy scattering medium

Yeh Wei Yu, Ching Cherng Sun, Xing Chen Liu, Wei Hsin Chen, Szu Yu Chen, Yu Heng Chen, Chih Shun Ho, Che Chu Lin, Tsung Hsun Yang, Po Kai Hsieh

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Digital optical phase conjugation (DOPC) is a well-known technique for generating a counter-propagating wavefront and reversing multiple scattering effects. Until now, implementations of DOPC are mostly based on a switching geometry. For some applications such as optical tweezers in turbid media, however, switching-based DOPC could fail to grab fast-moving particles. Besides, a DOPC modality with temporally-continuous gain is required. In this paper, a continuous amplified digital optical phase conjugator (CA-DOPC) is introduced to form a focusing point after passing through a heavily scattering medium. To achieve high-precision alignment between the CMOS image sensor and the spatial light modulator (SLM) in the CA-DOPC, an optical phase conjugator along with a specially designed alignment pattern was used. In this research, the CA-DOPC showed its ability to form a focus point in 2-mm-thick chicken muscle tissue. In addition, a continuous gain of 166 and peak-to-background ratio (PBR) of 3×10⁵ were observed in the case of 0.5-mm chicken muscle tissue.

Original language	English
Pages (from-to)	703-714
Number of pages	12
Journal	OSA Continuum
Volume	2
Issue number	3
DOIs	https://doi.org/10.1364/OSAC.2.000703
State	Published - 15 Mar 2019

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title = "Continuous amplified digital optical phase conjugator for focusing through thick, heavy scattering medium",

abstract = "Digital optical phase conjugation (DOPC) is a well-known technique for generating a counter-propagating wavefront and reversing multiple scattering effects. Until now, implementations of DOPC are mostly based on a switching geometry. For some applications such as optical tweezers in turbid media, however, switching-based DOPC could fail to grab fast-moving particles. Besides, a DOPC modality with temporally-continuous gain is required. In this paper, a continuous amplified digital optical phase conjugator (CA-DOPC) is introduced to form a focusing point after passing through a heavily scattering medium. To achieve high-precision alignment between the CMOS image sensor and the spatial light modulator (SLM) in the CA-DOPC, an optical phase conjugator along with a specially designed alignment pattern was used. In this research, the CA-DOPC showed its ability to form a focus point in 2-mm-thick chicken muscle tissue. In addition, a continuous gain of 166 and peak-to-background ratio (PBR) of 3×105 were observed in the case of 0.5-mm chicken muscle tissue.",

author = "Yu, {Yeh Wei} and Sun, {Ching Cherng} and Liu, {Xing Chen} and Chen, {Wei Hsin} and Chen, {Szu Yu} and Chen, {Yu Heng} and Ho, {Chih Shun} and Lin, {Che Chu} and Yang, {Tsung Hsun} and Hsieh, {Po Kai}",

note = "Publisher Copyright: {\textcopyright} 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.",

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T1 - Continuous amplified digital optical phase conjugator for focusing through thick, heavy scattering medium

AU - Yu, Yeh Wei

AU - Sun, Ching Cherng

AU - Liu, Xing Chen

AU - Chen, Wei Hsin

AU - Chen, Szu Yu

AU - Chen, Yu Heng

AU - Ho, Chih Shun

AU - Lin, Che Chu

AU - Yang, Tsung Hsun

AU - Hsieh, Po Kai

PY - 2019/3/15

Y1 - 2019/3/15

N2 - Digital optical phase conjugation (DOPC) is a well-known technique for generating a counter-propagating wavefront and reversing multiple scattering effects. Until now, implementations of DOPC are mostly based on a switching geometry. For some applications such as optical tweezers in turbid media, however, switching-based DOPC could fail to grab fast-moving particles. Besides, a DOPC modality with temporally-continuous gain is required. In this paper, a continuous amplified digital optical phase conjugator (CA-DOPC) is introduced to form a focusing point after passing through a heavily scattering medium. To achieve high-precision alignment between the CMOS image sensor and the spatial light modulator (SLM) in the CA-DOPC, an optical phase conjugator along with a specially designed alignment pattern was used. In this research, the CA-DOPC showed its ability to form a focus point in 2-mm-thick chicken muscle tissue. In addition, a continuous gain of 166 and peak-to-background ratio (PBR) of 3×105 were observed in the case of 0.5-mm chicken muscle tissue.

AB - Digital optical phase conjugation (DOPC) is a well-known technique for generating a counter-propagating wavefront and reversing multiple scattering effects. Until now, implementations of DOPC are mostly based on a switching geometry. For some applications such as optical tweezers in turbid media, however, switching-based DOPC could fail to grab fast-moving particles. Besides, a DOPC modality with temporally-continuous gain is required. In this paper, a continuous amplified digital optical phase conjugator (CA-DOPC) is introduced to form a focusing point after passing through a heavily scattering medium. To achieve high-precision alignment between the CMOS image sensor and the spatial light modulator (SLM) in the CA-DOPC, an optical phase conjugator along with a specially designed alignment pattern was used. In this research, the CA-DOPC showed its ability to form a focus point in 2-mm-thick chicken muscle tissue. In addition, a continuous gain of 166 and peak-to-background ratio (PBR) of 3×105 were observed in the case of 0.5-mm chicken muscle tissue.

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JO - OSA Continuum

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Continuous amplified digital optical phase conjugator for focusing through thick, heavy scattering medium

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