Efficient optical trapping with cylindrical vector beams

Moradi, Habib; Shahabadi, Vahid; Madadi, Ebrahim; Karimi, Ebrahim; Hajizadeh, Faegheh

doi:10.1364/oe.27.007266

Cited by 67 publications

(36 citation statements)

References 29 publications

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“…In addition, the CVBs with the complex shape of the intensity distribution hold promise for the realization of efficient optical trapping of nano-and microparticles 53,54 . Thus, it has recently been shown that choosing the right polarisation distribution enhances the trapping efficiency for particles of certain sizes 55 . Such complex CVBs also allow one to improve the axial trapping efficiency for non-spherical nano-and microobjects, similar to the case of trapping of carbon nanotubes 56 .…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Variable transformation of singular cylindrical vector beams using anisotropic crystals

Хонина

Porfirev

Kazanskiy

2020

Sci Rep

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We demonstrated and investigated, both theoretically and experimentally, the transformation of cylindrical vector beams with an embedded phase singularity under the condition of focusing perpendicularly to the axis of the anisotropic calcite crystal. Theoretical and numerical analysis, performed on the basis of decomposing the light field into a set of plane waves for an anisotropic medium, allowed us to study the dependence of the structural transformation of the initial laser beam on the polarisation and phase state in detail. the proposed approach allows one to perform the visual recognition of cylindrically-polarised vector beams of various orders and can be used for the demultiplexing of information channels in the case of polarisation-division multiplexing. The experimentally-obtained results agree with the theoretical findings and demonstrate the reliability of the approach. Nonparaxial propagation of laser modes in a medium with strong anisotropy leads to complex polarisation-phase transformations 1-3 , which allow for the formation of inhomogeneously polarised beams 4-9 , as well as beams with vortex phase singularities 10-13. In the latter case, it is possible to observe the transformation of the initial circularly-polarised beam with non-zero spin angular momentum into a laser beam with non-zero orbital angular momentum. These effects can also be produced by focusing laser radiation along the axis of an anisotropic crystal, due to the interaction of the ordinary and extraordinary beams 14. When laser beams propagate perpendicularly to the crystal axis 2,3,15-22 , various effects are observed. In particular, for Bessel beams, pronounced astigmatic distortion of the ring structure of the beam occurs 3,18,21,22. For Gaussian beams, the astigmatic transformation is hardly noticeable 23 , since natural crystals, as a rule, have a slight relative difference between the ordinary and extraordinary refractive indices. To enhance the astigmatic transformation and make it visually noticeable, sharply focused vortex Gaussian beams are used. In this case, the influence of the polarisation of the illuminating beam becomes especially important 24. In the present paper, the variable transformation of singular cylindrical vector beams (CVBs) 25-27 using an anisotropic crystal is investigated theoretically, numerically, and experimentally. In order to introduce into the initial CVB a complex singular phase of superposition of optical vortices, we used a spatial light modulator (SLM). Earlier, SLMs were also used for modification of incident laser radiation and the generation of amplitude-squeezed high-order vector beams by means of a collinear interferometric technique 28. Because of the use of the SLM, the vortex composition and the weight ratio in this superposition can change dynamically. Following this, when the generated field is focused perpendicularly to the axis of an anisotropic crystal, a selective (polarisation-dependent) astigmatic transformation of the individual components of the electric field occurs. Thi...

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Section: Conclusion and Discussionmentioning

confidence: 99%

Variable transformation of singular cylindrical vector beams using anisotropic crystals

Хонина

Porfirev

Kazanskiy

2020

Sci Rep

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“…Due to their distinctive polarization distributions, VV beams have shown unique features, making them appealing for different research purposes, e.g. microscopy [54], optical trapping [55,56], metrology [57,58], nanophotonics [59] and communication [60][61][62][63][64][65][66][67]. Formally, the state |R, (|L, ) describes a photon with uniform right (left) circular polarization carrying of OAM, and a VV beam can be conveniently described by a non-separable superposition of polarization-OAM eigenmodes.…”

Section: Vector Vortex Beam and Hybrid Entanglement Generationmentioning

confidence: 99%

Air-core fiber distribution of hybrid vector vortex-polarization entangled states

et al. 2019

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Entanglement distribution between distant parties is one of the most important and challenging tasks in quantum communication. Distribution of photonic entangled states using optical fiber links is a fundamental building block towards quantum networks. Among the different degrees of freedom, orbital angular momentum (OAM) is one of the most promising due to its natural capability to encode high dimensional quantum states. In this article, we experimentally demonstrate fiber distribution of hybrid polarization-vector vortex entangled photon pairs. To this end, we exploit a recently developed air-core fiber which supports OAM modes. High fidelity distribution of the entangled states is demonstrated by performing quantum state tomography in the polarization-OAM Hilbert space after fiber propagation, and by violations of Bell inequalities and multipartite entanglement tests. The present results open new scenarios for quantum applications where correlated complex states can be transmitted by exploiting the vectorial nature of light.

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“…In (6), x = krsinθ, J m (x) is the m-th order Bessel function, A m (θ) = B (θ, ϕ) is a real function describing the amplitude of the input field in the plane of the entrance pupil of the aplanatic system. It depends only on the angle θ and the order m of the polarization singularity.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Interest in the сylindrical vector beams (CVB), which polarization rotates in the cross-section with the azimuthal angle 0 ࣘ ϕ ࣘ 2π, continues unabated to this day [1]- [6], although they have been investigated in optics for a long time [7]- [11]. Previously researchers have made attempts to generalize cylindrical vector beams by investigating the beams with direction of polarization making several rotations.…”

Section: Introductionmentioning

confidence: 99%

The Non-Vortex Inverse Propagation of Energy in a Tightly Focused High-Order Cylindrical Vector Beam

2019

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In this paper, the tight focusing of high-order cylindrical vector beams (beams with polarization singularity) was investigated. Using the Richards-Wolf formalism, there were obtained expressions for all projections of the electric and magnetic light fields with m-order polarization singularity in the focus of the aplanatic system. Also expressions for the longitudinal component of the Poynting vector were obtained. It was shown that these beams produce in the focal areas with the direction of the Poynting vector opposite to the direction of propagation of the beam. Moreover, the negative values could be comparable in absolute value with positive values; however, this strong inverse energy flow is obtained only while laser light is focused by a lens with high numerical aperture. Of particular interest is the case when the beam order is two (m = 2). In this case, the region where the Poynting vector longitudinal projection is negative is located on the optical axis. If the order of the beam is more than two (m > 2), than the reverse flow occurs near the optical axis and has a shape of a "tube." Moreover, the width of the negative values region (the diameter of the "tube") increases with increasing order of the beam, however, the absolute value of energy backflow decreases. Earlier, we reported on the observation of a spiral negative energy flow from the center of the focal plane of a focused vortex beam. In this paper, the negative propagation of a laminar near-axis energy flow is reported.

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Efficient optical trapping with cylindrical vector beams

Cited by 67 publications

References 29 publications

Variable transformation of singular cylindrical vector beams using anisotropic crystals

Variable transformation of singular cylindrical vector beams using anisotropic crystals

Air-core fiber distribution of hybrid vector vortex-polarization entangled states

The Non-Vortex Inverse Propagation of Energy in a Tightly Focused High-Order Cylindrical Vector Beam

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