Characterizing coherence vortices through geometry

Alves, Cleberson R.; Jesus‐Silva, Alcenísio J.; Fonseca, E. J. S.

doi:10.1364/ol.40.002747

Cited by 29 publications

(14 citation statements)

References 21 publications

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“…The phase singularities have also been observed in correlation functions and named as coherence vortices [47,[53][54][55]. The singularities have been verified both theoretically and experimentally using the interferometric techniques.…”

Section: Introductionmentioning

confidence: 77%

Correlations in Scattered Phase Singular Beams

Vanitha¹,

Salla²,

Singh³

2023

Holography - Recent Advances and Applications

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We discuss about the correlations present in the scattered phase singular beams and utilize them for obtaining the corresponding mode information. We experimentally generate the coherence vortices using the cross-correlation functions between the speckle patterns and validate them with the exact analytical expressions. We also explore their propagation characteristics by considering their geometry along with their divergence. We utilize the autocorrelation measurements of speckle patterns for obtaining the mode information. Further, we study the correlations present in scattered perfect optical vortices which lead to a new class of coherence functions, Bessel-Gauss coherence functions, and utilized for generating the non-diffracting random fields, i.e. propagation invariant fields. We utilized these correlation functions, which are order-dependent although the speckle patterns are order-independent, for encrypting the information which has higher advantage than normal random optical fields.

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Section: Introductionmentioning

confidence: 77%

Correlations in Scattered Phase Singular Beams

Vanitha¹,

Salla²,

Singh³

2023

Holography - Recent Advances and Applications

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“…The correlations in light beams are becoming one of the promising fields of study as it plays a vital role in certain applications such as communication [2][3]. The correlation functions that have singularities are named as "coherent vortices" [4][5]. Recently, these coherent vortices are realized in the intensity correlation of two speckle patterns of different orders [5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The correlation functions that have singularities are named as "coherent vortices" [4][5]. Recently, these coherent vortices are realized in the intensity correlation of two speckle patterns of different orders [5][6].…”

Section: Introductionmentioning

confidence: 99%

Scattering of Perfect Optical Vortex Beams: Physical Unclonable Function

Das¹,

Vanitha²,

Reddy³

et al. 2021

AJOP

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Now-a-days, data security has become an important part for anyone connected to the web. Data security ensures that data is getting transmitted securely without any modifications or alterations to the intended receiver. To achieve data security, we have focused on the cryptography which helps to protect our information from being stolen or third-party attacks. Encryption techniques demonstrate an excellent deal of data security when implemented in an optical system such as Holography due to the inherent physical properties of light and the precision it demands. Such systems are somehow vulnerable during their digital implementation under various attacks called crypt-analysis due to the predictable nature of security keys used for the encryption. In this work, we are presenting a Physically Unclonable Functions (PUFs) for producing a robust (stable over time) security key for digital encryption systems. More specifically, we have used the correlation functions of scattered perfect optical vortex beams for the generation of keys which can be used for encryption of data. Here, we convert the 2-D correlation function to 1-D key and digitize based on the average value which will be the random sequence of 1s and 0s. In the best of our knowledge, we are reporting this work for the first time. The experiment and simulation results are well matched.

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“…Spatially incoherent optical vortices, are vortices originated by passing an incoherent light through a hologram designed to generate optical vortices 14 or when a coherent optical vortex is scattered by a rough surface [15][16][17][18] . Those works have shown that the generated light presents a vortex in the coherence function, the so-called coherence vortex 19 .…”

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confidence: 99%

Sorting of spatially incoherent optical vortex modes

Bezerra

Amaral

Fonseca

et al. 2020

Sci Rep

Self Cite

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coherent optical vortices have promising applications in quantum and classical optical communication. they add new degrees of freedom to code information. in this context, to implement a tool enabling sorting of spatially multiplexed vortex states is fundamental. By other hand, spatially incoherent vortices can be more robust in propagation through noise media, such as turbulent atmosphere or obstacles that block part of the light. therefore, in this work we propose directly applying a highresolution sorting scheme to spatially incoherent vortex states.

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Characterizing coherence vortices through geometry

Cited by 29 publications

References 21 publications

Correlations in Scattered Phase Singular Beams

Correlations in Scattered Phase Singular Beams

Scattering of Perfect Optical Vortex Beams: Physical Unclonable Function

Sorting of spatially incoherent optical vortex modes

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