Observed Scattering into a Dark Optical Vortex Core

Palacios, David; Rozas, D.; Swartzlander, Grover A.

doi:10.1103/physrevlett.88.103902

Cited by 57 publications

(21 citation statements)

References 12 publications

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“…Light beams carrying OAM have wide applications in trapping particles, imaging and medical diagnosis, micro-machines, and quantum information. [1][2][3][4][5]. Therefore, it is of great interest to reveal the influence of OAM states of the vortex beams on the propagation and penetration capabilities through the turbid media.…”

Section: Introductionmentioning

confidence: 99%

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Propagation and transmission of optical vortex beams through turbid scattering wall with orbital angular momentums

et al. 2015

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Light scattering and transmission of optical Laguerre Gaussian (LG) vortex beams with different orbital angular momentum (OAM) states in turbid scattering media were investigated in comparison with Gaussian (G) beam. The scattering media used in the experiments consist of various sizes and concentrations of latex beads in water solutions. The LG beams were generated using a spatial light modulator in reflection mode. The ballistic transmissions of LG and G beams were measured with different ratios of thickness of samples (z) to scattering mean free path (l s ) of the turbid media, z/l s . The results show that in the ballistic region where z/l s is small, the LG and G beams show no significant difference, while in the diffusive region where z/ls is large, LG beams show higher transmission than Gaussian beam. In the diffusive region, the LG beams with higher orbital angular momentum L values show higher transmission than the beams with lower L values. The transition points from ballistic to diffusive regions for different scattering media were studied and determined.

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Section: Introductionmentioning

confidence: 99%

“…Over the past decade, the properties of optical vortex beams propagating through free space and scattering media have been investigated, and the phase singularities and optical vortices have been revealed [1][2][3][4][5]. The LG complex beams add a new dimension to light's spatial degrees of freedom for light propagating in turbid media.…”

Section: Introductionmentioning

confidence: 99%

Propagation and transmission of optical vortex beams through turbid scattering wall with orbital angular momentums

et al. 2015

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“…As a result, after the vortex mask, the probe beam propagates within the dark core of the control field beam, and the bright portion of the control field can be blocked with an appropriately-sized aperture, leaving only the probe discernible. Similar OVFs have been effectively used to distinguish a dim signal from a stronger background in several applications, such as the detection of extra-solar planets [15][16][17] and incoherent scattering [18]. In our experiment, we used a prototype OVF to detect the EIT resonance in a Λ system formed by control and probe optical fields tuned to the 5S 1/2 F = 2 → 5P 1/2 F ′ = 2 and 5S 1/2 F = 1 → 5P 1/2 F ′ = 2 transitions of the D 1 line of 87 Rb correspondingly.…”

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confidence: 99%

Optical vortex filtering for the detection of electromagnetically induced transparency

et al. 2011

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We report the realization of an optical filter based on an optical vortex mask designed to exclusively detect a weak coherent laser field in the presence of much stronger spatially-overlapping field. We demonstrate the performance of such an optical vortex filter to eliminate the strong control field and detect only a weak optical field's transmission under the conditions of electromagnetically induced transparency. The attractive feature of such filter is its insensitivity to optical field frequencies and polarizations, which makes it applicable for a wide range of coherent processes.

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“…Vortex modes appear in optical systems ranging from the highly symmetric [2]) to the random [3,4]. Although the characteristics of coherent vortex waves are well understood [5], the nature of partially coherent vortices is still emerging [6][7][8][9][10][11][12][13][14][15][16]. Perfect spatial coherence (and incoherence) is not physical, and thus a lack of understanding is a fundamental problem.…”

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confidence: 99%

Optical Rankine Vortex

Swartzlander

2005

Frontiers in Optics

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Rankine vortex charateristics of a partially coherent optical vortex are explored using classical and physical optics. Unlike a perfectly coherent vortex mode, the circulation is not quantized.Excess circulation is predicted owing to the wave nature of the composite vortex fields. Based on these findings we propose a vortex stellar interferometer.Vortices exist in all realms of physics and thus the vortex state is universal and robust. In practice the rotational motion is often characterized as a Rankine vortex [1] whereby an inner region near the vortex core rotates as a solid body, and an outer region rotates as an ideal fluid.Within a characteristic radius, R cr , the tangential velocity tends to increase linearly with radial distance from the vortex core, and outside this radius it decreases inversely. Optical (and other wavefunction) vortices are frequently described as perfectly coherent modes exhibiting the quantized circulation of an ideal fluid. This Letter describes how spatial coherence properties require an optical vortex to exhibit Rankine vortex characteristics. Not only does the circulation of the system violate the quantization rule, it may also exceed that of the composing fields. This excess circulation is attributed to the wave nature of the system. We first give a geometrical optics account of the system to identify its basic features. Next we briefly introduce a vortex density formalism. Finally we give a statistical optics account that includes numerical computations of ensemble averaged quantities.

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Observed Scattering into a Dark Optical Vortex Core

Abstract: The dark core of an optical vortex was used to detect on-axis, forward-scattered light from a colloidal solution in the single and multiple scattering regimes. Using no adjustable parameters we obtain good agreement with a concentration-dependent scattering model.

Cited by 57 publications

References 12 publications

Propagation and transmission of optical vortex beams through turbid scattering wall with orbital angular momentums

Propagation and transmission of optical vortex beams through turbid scattering wall with orbital angular momentums

Optical vortex filtering for the detection of electromagnetically induced transparency

Optical Rankine Vortex

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