Properties of vortex light fields generated by generalized spiral phase plates

Хонина, С. Н.; Ustinov, Andrey V.; Logachev, Valentin I.; Porfirev, Alexey P.

doi:10.1103/physreva.101.043829

Cited by 53 publications

(28 citation statements)

References 26 publications

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“…Thus, we have no guarantee that the phase satisfying condition defined by Equation ( 22) will be optimal. Therefore, the final conclusion will be made on the basis of numerical modeling by using exact Equation (9).…”

Section: Determination Of Conditions For Inverse Energy Flow On the Optical Axismentioning

confidence: 99%

“…A power-exponent phase plate (PEPP) [7,8] with the transmission function described as exp[i2πm(ϕ/2π) s ], where m and s are arbitrary numbers and ϕ is an azimuthal angle, can be used for shaping a spiral intensity distribution. In 2020, we showed that a generalized spiral phase plate (GSPP) [9,10] with the transmission function exp[ig(ϕ)], where g(ϕ) is an arbitrary smooth monotonic function, always forms a spiral intensity distribution with a phase singularity point in the focal plane of a lens. Variations in the phase function g(ϕ) affect the size and the twisting degree of the generated light spiral, thereby determining the phase gradient along the light curve, which is an important light-field characteristic for laser manipulation [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Formation of Inverse Energy Flux in the Case of Diffraction of Linearly Polarized Radiation by Conventional and Generalized Spiral Phase Plates

2021

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Recently, there has been increased interest in the shaping of light fields with an inverse energy flux to guide optically trapped nano- and microparticles towards a radiation source. To generate inverse energy flux, non-uniformly polarized laser beams, especially higher-order cylindrical vector beams, are widely used. Here, we demonstrate the use of conventional and so-called generalized spiral phase plates for the formation of light fields with an inverse energy flux when they are illuminated with linearly polarized radiation. We present an analytical and numerical study of the longitudinal and transverse components of the Poynting vector. The conditions for maximizing the negative value of the real part of the longitudinal component of the Poynting vector are obtained.

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Section: Determination Of Conditions For Inverse Energy Flow On the Optical Axismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of Inverse Energy Flux in the Case of Diffraction of Linearly Polarized Radiation by Conventional and Generalized Spiral Phase Plates

2021

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“…The TEFD in the plane

is proportional to the product of the field intensity and phase gradient [ 32 , 42 , 43 ]:

where

is the phase of the field in the plane

.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Note that in these works, to obtain the rotation effect, either the spatial combination of different beams was used, for example, by sectors [ 35 ], rings [ 36 ], or inserting a nonlinear vortex phase into a beam [ 23 ]. The second approach is more convenient for experimental implementation; however, the nonlinear vortex phase provides the formation of one type of transverse distribution in the form of a spiral [ 43 ].…”

Section: Introductionmentioning

confidence: 99%

Generation of Complex Transverse Energy Flow Distributions with Autofocusing Optical Vortex Beams

et al. 2021

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Optical vortex (OV) beams are widely used for the generation of light fields with transverse energy flow inducing orbital motion of the nano- and microparticles in the transverse plane. Here, we present some new modifications of OV beams with autofocusing properties for shaping complex transverse energy flow distributions varying in space. The angular component of the complex amplitude of these beams is defined by the superpositions of OV beams with different topological charges. The proposed approach provides a convenient method to control the three-dimensional structure of the generated autofocusing OV beams. The control of the transverse distribution of an autofocusing beam provides a wide variety of generated fields with both rotating and periodic properties, which can be used in the field of laser manipulation and laser material processing. Thus, the obtained numerical results predict different types of motion of the trapped particles for the designed OV autofocusing beams. The experimental results agree with modeling results and demonstrate the principal possibility to shape such laser beams using spatial light modulators.

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“…Spiral shaped beams are conventionally obtained by means of spiral phase plates 1 or by interfering Gaussian waves with the so-called longitudinal orbital angular momentum (LOAM) carrying beams 2 . LOAM beams are peculiar solutions of Maxwell’s equations, characterized by phase singularity and helical wavefront 3 , 4 .…”

Section: Introductionmentioning

confidence: 99%

Rainbow Archimedean spiral emission from optical fibres

Mangini

Ferraro

Zitelli

et al. 2021

Sci Rep

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We demonstrate a new practical approach for generating multicolour spiral-shaped beams. It makes use of a standard silica optical fibre, combined with a tilted input laser beam. The resulting breaking of the fibre axial symmetry leads to the propagation of a helical beam. The associated output far-field has a spiral shape, independently of the input laser power value. Whereas, with a high-power near-infrared femtosecond laser, a visible supercontinuum spiral emission is generated. With appropriate control of the input laser coupling conditions, the colours of the spiral spatially self-organize in a rainbow distribution. Our method is independent of the laser source wavelength and polarization. Therefore, standard optical fibres may be used for generating spiral beams in many applications, ranging from communications to optical tweezers and quantum optics.

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Properties of vortex light fields generated by generalized spiral phase plates

Cited by 53 publications

References 26 publications

Formation of Inverse Energy Flux in the Case of Diffraction of Linearly Polarized Radiation by Conventional and Generalized Spiral Phase Plates

Formation of Inverse Energy Flux in the Case of Diffraction of Linearly Polarized Radiation by Conventional and Generalized Spiral Phase Plates

Generation of Complex Transverse Energy Flow Distributions with Autofocusing Optical Vortex Beams

Rainbow Archimedean spiral emission from optical fibres

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