Reference-less measurement of the transmission matrix of a highly scattering material using a DMD and phase retrieval techniques

Drémeau, Angélique; Liutkus, Antoine; Martina, David; Katz, Ori; Schülke, Christophe; Krząkała, Florent; Gigan, Sylvain; Daudet, Laurent

doi:10.1364/oe.23.011898

Cited by 217 publications

(148 citation statements)

References 35 publications

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“…However, recently, researchers began to notice that the seemingly random scattering events and the resultant speckles are actually deterministic within a certain temporal window [37,38], and it is possible to reverse [39][40][41] or compensate for [42] the scattering-induced phase scrambling. To do so, researchers have developed several wavefront shaping (sometimes also referred to wavefront engineering) techniques, such as iterative wavefront optimization [23][24][25][26]28,[42][43][44][45][46][47][48][49][50][51], measuring the transmission matrix of the scattering medium [21,22,[52][53][54][55][56], and optical time reversal via phase conjugation [39,40,[57][58][59][60][61][62][63][64][65]. Nevertheless, the goals of these implementations are identical, i.e., to make light wavelets traveling along different optical paths interfere coherently at a region of interest (ROI) and form a bright optical spot (focus) out of the much darker background.…”

Section: Introductionmentioning

confidence: 99%

Wavefront Shaping and Its Application to Enhance Photoacoustic Imaging

Lai

2017

Applied Sciences

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Abstract:Since its introduction to the field in mid-1990s, photoacoustic imaging has become a fast-developing biomedical imaging modality with many promising potentials. By converting absorbed diffused light energy into not-so-diffused ultrasonic waves, the reconstruction of the ultrasonic waves from the targeted area in photoacoustic imaging leads to a high-contrast sensing of optical absorption with ultrasonic resolution in deep tissue, overcoming the optical diffusion limit from the signal detection perspective. The generation of photoacoustic signals, however, is still throttled by the attenuation of photon flux due to the strong diffusion effect of light in tissue. Recently, optical wavefront shaping has demonstrated that multiply scattered light could be manipulated so as to refocus inside a complex medium, opening up new hope to tackle the fundamental limitation. In this paper, the principle and recent development of photoacoustic imaging and optical wavefront shaping are briefly introduced. Then we describe how photoacoustic signals can be used as a guide star for in-tissue optical focusing, and how such focusing can be exploited for further enhancing photoacoustic imaging in terms of sensitivity and penetration depth. Finally, the existing challenges and further directions towards in vivo applications are discussed.

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Section: Introductionmentioning

confidence: 99%

Wavefront Shaping and Its Application to Enhance Photoacoustic Imaging

Lai

2017

Applied Sciences

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“…However, because of the refractive index inhomogeneity, light is scattered when propagating through scattering media. To focus light through such turbid media, researchers have developed a number of wavefront shaping techniques, including feedback-based methods [9,10], optical phase conjugation [11][12][13][14] and transmission matrix methods [15][16][17][18]. Feedback-based methods employ a spatial light modulator (SLM) to continuously shape the wavefront of the incident light while monitoring the feedback signal from a guidestar which is proportional to the light intensity at a target location.…”

Section: Introductionmentioning

confidence: 99%

Focusing light through scattering media by transmission matrix inversion

Xu¹,

Ruan²,

Liu³

et al. 2017

Opt. Express

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Focusing light through scattering media has broad applications in optical imaging, manipulation and therapy. The contrast of the focus can be quantified by peak-to-background intensity ratio (PBR). Here, we theoretically and numerically show that by using a transmission matrix inversion method to achieve focusing, within a limited field of view and under a low noise condition in transmission matrix measurements, the PBR of the focus can be higher than that achieved by conventional methods such as optical phase conjugation or feedback-based wavefront shaping. Experimentally, using a phase-modulation spatial light modulator, we increase the PBR by 66% over that achieved by conventional methods based on phase conjugation. In addition, we demonstrate that, within a limited field of view and under a low noise condition in transmission matrix measurements, our matrix inversion method enables light focusing to multiple foci with greater fidelity than those of conventional methods.

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“…These matrices provide the phase information required to control the resultant light scatter [8][9][10][11]. These transmission matrices were measured with microscopic objectives and thin films of turbid media, resulting in a propagation distance of less than 1 mm and an observation plane field of view of a few hundred microns.…”

Section: Introductionmentioning

confidence: 99%

Measuring the Reflection Matrix of a Rough Surface

et al. 2017

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Phase modulation methods for imaging around corners with reflectively scattered light required illumination of the occluded scene with a light source either in the scene or with direct line of sight to the scene. The RM (reflection matrix) allows control and refocusing of light after reflection, which could provide a means of illuminating an occluded scene without access or line of sight. Two optical arrangements, one focal-plane, the other an imaging system, were used to measure the RM of five different rough-surface reflectors. Intensity enhancement values of up to 24 were achieved. Surface roughness, correlation length, and slope were examined for their effect on enhancement. Diffraction-based simulations were used to corroborate experimental results.

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Reference-less measurement of the transmission matrix of a highly scattering material using a DMD and phase retrieval techniques

Cited by 217 publications

References 35 publications

Wavefront Shaping and Its Application to Enhance Photoacoustic Imaging

Wavefront Shaping and Its Application to Enhance Photoacoustic Imaging

Focusing light through scattering media by transmission matrix inversion

Measuring the Reflection Matrix of a Rough Surface

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