Optical coherence and electromagnetic surface waves

Chen, Yahong; Norrman, Andreas; Ponomarenko, Sergey A.; Friberg, Ari T.

doi:10.1016/bs.po.2019.11.001

Cited by 24 publications

(5 citation statements)

References 141 publications

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“…As a fundamental attribute that describes statistical properties of random light fields, optical coherence has played an important role in understanding and tailoring light-matter interactions [1,2]. Spatial coherence, in particular, governs a multitude of intriguing optical phenomena and features in a number of applications [3,4]. Even a straightforward adjustment of a spatial coherence length of light can go a long way to improve the image quality of a microscope [5,6] and to reduce the turbulence induced field degradation in optical communications [7].…”

Section: Intorductionmentioning

confidence: 99%

Optical Coherence Encryption with Structured Random Light

Peng¹,

Huang²,

Liu

et al. 2021

Preprint

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Information encryption with optical technologies has become increasingly important due to remarkable multidimensional capabilities of light fields. However, the optical encryption protocols proposed to date have been primarily based on the first-order field characteristics, such as the optical field amplitude and phase as well as its polarization. As the said first-order characteristics of light fields are strongly affected by interference effects, the conventional encoding protocols become quite unstable during light propagation and interaction with the matter. Here, we introduce an alternative optical encryption protocol whereby the information is encoded into the spatial coherence distribution of a structured random light beam via a generalized van Cittert--Zernike theorem. We show that the proposed approach has two key advantages over its conventional counterparts. First, the complexity of measuring the spatial coherence distribution of light enhances the encryption protocol security. Second, the relative insensitivity of the second-order statistical characteristics of light to environmental noise makes the protocol robust against the environmental fluctuations, e.g, the atmospheric turbulence. We carry out experiments to demonstrate the feasibility of the coherence-based encryption method with the aid of a fractional Fourier transform. Our results open up a promising avenue for further research into optical encryption in complex environments.

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Section: Intorductionmentioning

confidence: 99%

Optical Coherence Encryption with Structured Random Light

Peng¹,

Huang²,

Liu

et al. 2021

Preprint

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“…Optical coherence is now the subject of a well-developed theory [1]; the laser beam with decreased spatial coherence has been analyzed in depth, and it has been labeled as the partially coherent beam (PCB) [2]. By adjusting the spatial coherence of PCBs, novel properties can be exhibited that play a significant role in the light-matter interaction and have attracted the attention of researchers [1,3]. In the past few decades, intense interest has been focused on the design of different types of PCBs and the interaction between PCBs and various media.…”

Section: Introductionmentioning

confidence: 99%

Self-Focusing Property of Partially Coherent Beam With Non-Uniform Correlation Structure in Non-Linear Media

Wang

et al. 2022

Front. Phys.

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Coherence in a light beam has the potential to serve as a degree of freedom for manipulating the beam. In this work, the self-focusing property of a partially coherent beam with a non-uniform correlation structure propagating in a non-linear medium is investigated. The analysis of the evolution of beam width reveals that the coherence structure plays a vital role in the self-focusing formation. A threshold condition for the coherence radius is proposed for the first time, and the relation of self-focusing length and initial coherence radius is studied numerically and analytically. It is shown that a feasible approach for manipulating the self-focusing length by adjusting the initial coherence radius is achieved.

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“…Spatial coherence is an important characteristic to describe the statistical properties of random light fields, and it has played a vital role in understanding interference, propagation, and light-matter interaction of both classical and quantum wave fields [1][2][3]. Nowadays, the spatial coherence has already been viewed as an efficient tool for light field manipulations and applications [4].…”

Section: Introductionmentioning

confidence: 99%

Imaging Through Random Scatterer with Spatial Coherence Structure Measurement

et al. 2022

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Optical coherence is becoming an efficient degree of freedom for light field manipulations and applications. In this work, we show that the image information hidden a distance behind a random scattering medium is encoded in the complex spatial coherence structure of a partially coherent light beam that generates after the random scatterer. We validate in experiment that the image information can be well recovered with the spatial coherence measurement and the aid of the iterative phase retrieval algorithm in the Fresnel domain. We find not only the spatial shape but also the position including the lateral shift and longitudinal distances of the image hidden behind the random scatterer can be reconstructed, which indicates the potential uses in three-dimensional optical imaging through random scattering media.

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Optical coherence and electromagnetic surface waves

Cited by 24 publications

References 141 publications

Optical Coherence Encryption with Structured Random Light

Optical Coherence Encryption with Structured Random Light

Self-Focusing Property of Partially Coherent Beam With Non-Uniform Correlation Structure in Non-Linear Media

Imaging Through Random Scatterer with Spatial Coherence Structure Measurement

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