Focusing light through random scattering media by four-element division algorithm

Fang, Longjie; Zhang, Xicheng; Zuo, Haoyi; Pang, Lin

doi:10.1016/j.optcom.2017.08.062

Cited by 37 publications

(16 citation statements)

References 14 publications

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“…This algorithm was firstly presented by Fang et al [21] and the working principle behind it is by applying a two-by-two division of a square matrix so that it results in four matrices of equal size. Afterwards, the algorithm recursively acts on each of these resulting matrices originating new, smaller, matrices.…”

Section: Four-element Division Algorithm (Feda)mentioning

confidence: 99%

Evaluation of Three Iterative Algorithms for Phase Modulation Regarding Their Application in Concentrating Light Inside Biological Tissues for Laser Induced Photothermal Therapy

2021

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The focusing of light through turbid media like biological tissues is strongly hindered by the scattering of light which limits its safe practice and application in medicine. In order to control this phenomenon, we shaped the incident wavefront using three algorithms including a four-element division algorithm, a partitioning algorithm, and simulated annealing to control, iteratively, a spatial light modulator (SLM). We have tested two different convergence criteria to achieve a focal point inside a turbid environment, made up of a mixture of agar and milk, set to mimic a specific depth of human skin, and provide comparison results. A camera and a lens are used to visualize the focal area and give feedback information to the algorithms. A discussion on the use of these algorithms and convergence criteria is presented, being focused on its convergence time and performance. Depending on the algorithm and operational parameters, improvements of 29% to 46% of the irradiance in the region of interest were accomplished.

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Section: Four-element Division Algorithm (Feda)mentioning

confidence: 99%

Evaluation of Three Iterative Algorithms for Phase Modulation Regarding Their Application in Concentrating Light Inside Biological Tissues for Laser Induced Photothermal Therapy

2021

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“…Unlike the case of the conventional lens, the light focusing via a scattering lens [38][39][40][41][42][43] actually contains two indispensable processes: (I) multiple scattering of light inside the scattering lens and (II) shaping the wavefront of light before the light transporting through the scattering lens. As a matter of fact, wavefront shaping is an emerging technology for optical imaging and focusing through disordered media [42][43][44] , by modulating the incident wavefront, which paves a way for manipulating the scattered light in an expected pattern.…”

Section: Propagation Of the Quantized Light Through A Scattering Lensmentioning

confidence: 99%

Scattering-lens based quantum imaging beyond shot noise

Yao

2021

Sci Rep

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The scheme of optical imaging using scattering lens can provide a resolution beyond the classical optical diffraction limit with a coherent-state input. Nevertheless, due to the shot noise of the coherent state, the corresponding signal-to-noise ratio and resolution are both still shot-noise-limited. In order to circumvent this problem, we theoretically propose an alternative scheme where the squeezed state (with a sub-shot noise) is considered as input and the quantum noise is then suppressed below the shot-noise level. Consequently, when comparing with the previous imaging scheme (using combination of coherent state and scattering lens), our proposal is able to achieve an enhanced signal-to-noise ratio for a given scattering lens. Meanwhile, it is demonstrated that the resolution is also improved. We believe that this method may afford a new way of using squeezed states and enable a higher performance than that of using coherent state and scattering lens.

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“…Our proposal can be completely realized in experiments under the current condition in laboratory nowadays, since this setting of phase modulation has been intensively investigated in theory and experiments over recent decades [48,49,[61][62][63][64][65][66][67][68][69][70]. However, different from previous works concentrating mainly on the enhanced intensity of the focused mode [48,49,71,72], our work will focus on the modified quantum fluctuation of the scattered mode.…”

Section: Modified Propagation Via Wavefront Shapingmentioning

confidence: 99%

Modulating quantum fluctuations of scattered light in disordered media via wavefront shaping

Li¹,

Yao²

2019

J. Opt. Soc. Am. B

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After multiple scattering of quadrature-squeezed lights in a disordered medium, the quadrature amplitudes of the scattered modes present an excess noise above the shot-noise level [Opt. Expr. 14, 6919 (2006)]. A natural question is raised whether there exists a method of suppressing the quadrature fluctuation of the output mode. The answer is affirmative. In this work, we prove that wavefront shaping is a promising method to reduce the quantum noise of quadrature amplitudes of the scattered modes. This reduction is owing to the destructive interference of quantum noise. Specifically, when the single-mode squeezed states are considered as inputs, the quantum fluctuation can always be reduced, even below the shot-noise level. These results may have potential applications in quantum information processing, for instance, sub-wavelength imaging using the scattering superlens with squeezed-state sources.

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Focusing light through random scattering media by four-element division algorithm

Cited by 37 publications

References 14 publications

Evaluation of Three Iterative Algorithms for Phase Modulation Regarding Their Application in Concentrating Light Inside Biological Tissues for Laser Induced Photothermal Therapy

Evaluation of Three Iterative Algorithms for Phase Modulation Regarding Their Application in Concentrating Light Inside Biological Tissues for Laser Induced Photothermal Therapy

Scattering-lens based quantum imaging beyond shot noise

Modulating quantum fluctuations of scattered light in disordered media via wavefront shaping

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