Propagation of Gaussian and Laguerre‐Gaussian vortex beams through mouse brain tissue

Shi, Lingyan; Lindwasser, Lukas; Wang, Wubao; Alfano, R. R.; Rodríguez-Contreras, Adrián

doi:10.1002/jbio.201700022

Cited by 21 publications

(12 citation statements)

References 28 publications

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“…This contrasts with most studies that collect signals from the whole transverse cross-section of the beam, where azimuthal integration over the phasor and its gradient field clearly give results that average to zero. Laser studies of phenomena such as the attenuated transmission of twisted light in probing turbid or structurally complex media [140,141], where locally inhomogeneous light scattering and absorption take place, may benefit from the differential response that can be identified in different transverse sectors of the beam. It is interesting to surmise whether such effects might also play into the retention or loss of information content in the propagation of twisted beams suffering the effects of atmospheric turbulence, a feature of keen interest to the optical vortex community [142][143][144][145][146].…”

Section: Discussionmentioning

confidence: 99%

Symmetry and Quantum Features in Optical Vortices

Andrews

2021

Symmetry

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Optical vortices are beams of laser light with screw symmetry in their wavefront. With a corresponding azimuthal dependence in optical phase, they convey orbital angular momentum, and their methods of production and applications have become one of the most rapidly accelerating areas in optical physics and technology. It has been established that the quantum nature of electromagnetic radiation extends to properties conveyed by each individual photon in such beams. It is therefore of interest to identify and characterize the symmetry aspects of the quantized fields of vortex radiation that relate to the beam and become manifest in its interactions with matter. Chirality is a prominent example of one such aspect; many other facets also invite attention. Fundamental CPT symmetry is satisfied throughout the field of optics, and it plays significantly into manifestations of chirality where spatial parity is broken; duality symmetry between electric and magnetic fields is also involved in the detailed representation. From more specific considerations of spatial inversion, amongst which it emerges that the topological charge has the character of a pseudoscalar, other elements of spatial symmetry, beyond simple parity inversion, prove to repay additional scrutiny. A photon-based perspective on these features enables regard to be given to the salient quantum operators, paying heed to quantum uncertainty limits of observables. The analysis supports a persistence in features of significance for the material interactions of vortex beams, which may indicate further scope for suitably tailored experimental design.

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Section: Discussionmentioning

confidence: 99%

Symmetry and Quantum Features in Optical Vortices

Andrews

2021

Symmetry

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“…Yu and Zhang investigated the beam spreading and wander of a partially coherent Lommel-Gaussian beam propagation in turbulent tissue using a power spectrum model of the tissue considering the structural length-scale and fractal dimension, and the results reveal that laser beam with loworder vortex suffers less turbulence interference [17]. Shi et al experimentally investigated light transmission in mouse brain tissues, and found that the transmittance of Gaussian and Laguerre-Gaussian (LG) beams is not significantly different, while the transmittance of circularly polarized LG beams increases significantly and is affected by the topological charge [18,19]. Duan et al analyzed the influences of the spatial correlation length on the relative spectral shift of GSM vortex beam propagation in turbulent tissue, and discovered that the spatial coherence of beams can accelerate spectral changes and slow down spectral jumps [20].…”

Section: Introductionmentioning

confidence: 99%

Average Intensity and Beam Quality of Hermite-Gaussian Correlated Schell-Model Beams Propagating in Turbulent Biological Tissue

et al. 2021

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The propagation characteristics of a Hermite-Gaussian correlated Schell-model (HGCSM) beam in the turbulence of biological tissue are analyzed. The average intensity, spectral degree of coherence, and the dependence of the propagation factors on the beam orders, transverse coherence width, fractal dimension, characteristic length of heterogeneity, and small length-scale factor are numerically investigated. It is shown that the HGCSM beam does not exhibit self-splitting properties on propagation in tissues due to the strong turbulence in the refractive index of biological tissue. The larger the beam orders, the fractal dimension, and the small length-scale factor are, or the smaller the transverse coherence width and the characteristic length of heterogeneity are, the smaller the normalized propagation factor is, and the better the beam quality of HGCSM beams in turbulence of biological tissue is. Moreover, under the same condition, the HGCSM beam is less affected by turbulence than of Gaussian Schell-model (GSM) beam. It is expected that the results obtained in this paper may be useful for the application of partially coherent beams in tissue imaging and biomedical diagnosis.

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“…[7][8][9][10][11][12][13][14] Recently, OAM modes have been particularly studied for their uses in biomedical applications of imaging and diagnosis. [15][16][17] In particular, they have been exploited for the development of noninvasive diagnostics on tissues. In this regard, studies comparing the transmittance to the Gaussian spatial mode on scattering media simulating real tissue properties have been carried out.…”

Section: Introductionmentioning

confidence: 99%

Transmission of vector vortex beams in dispersive media

et al. 2020

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Scattering phenomena affect light propagation through any kind of medium from free space to biological tissues. Finding appropriate strategies to increase the robustness to scattering is the common requirement in developing both communication protocols and imaging systems. Recently, structured light has attracted attention due to its seeming scattering resistance in terms of transmissivity and spatial behavior. Moreover, correlation between optical polarization and orbital angular momentum (OAM), which characterizes the so-called vector vortex beams (VVBs) states, seems to allow for the preservation of the polarization pattern. We extend the analysis by investigating both the spatial features and the polarization structure of vectorial optical vortexes propagating in scattering media with different concentrations. Among the observed features, we find a sudden swift decrease in contrast ratio for Gaussian, OAM, and VVB modes for concentrations of the adopted scattering media exceeding 0.09%. Our analysis provides a more general and complete study on the propagation of structured light in dispersive and scattering media.

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Propagation of Gaussian and Laguerre‐Gaussian vortex beams through mouse brain tissue

Cited by 21 publications

References 28 publications

Symmetry and Quantum Features in Optical Vortices

Symmetry and Quantum Features in Optical Vortices

Average Intensity and Beam Quality of Hermite-Gaussian Correlated Schell-Model Beams Propagating in Turbulent Biological Tissue

Transmission of vector vortex beams in dispersive media

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