Trapping two types of particles by using a tightly focused radially polarized power-exponent-phase vortex beam

Fan, Chengjin; Liu, Yongxin; Wang, Xiaoyan; Chen, Ziyang; Pu, Jixiong

doi:10.1364/josaa.35.000903

Cited by 29 publications

(10 citation statements)

References 25 publications

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“…[7] The PEPV beam has an asymmetric intensity distribution and, during propagation, the intensity rotates and gathers along the ring. [7] Therefore, PEPV beams have unique applications in particle capture and manipulation, which can not only capture two different types of particles at the same time, [8] but also automatically transport particles along the curved path and avoid obstacles. [9] In addition, the PEPV beam has stronger antiinterference when propagating in ocean turbulence.…”

Section: Introductionmentioning

confidence: 99%

Tightly focused properties of a partially coherent radially polarized power-exponent-phase vortex beam

Chen

2023

Chinese Phys. B

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In this paper, a partially coherent beam called radially polarized multi-Gaussian Schell-model power-exponent-phase vortex beam is introduced. Both the analytical formula of the beam propagating through the high numerical aperture objective lens based on the vectorial diffraction theory, and the cross-spectral density matrix of the beam in the focal region are derived. Then, the tight focusing characteristics of partially coherent radially polarized power-exponent-phase vortex beam are studied numerically, and the intensity distribution, degree of polarization and coherence of the beams in the focusing region of different topological charge, power order, beam index and coherence width are analyzed in detail. The results show that the contour of the spot becomes clearer and smoother with the increase of beam index, and the focal fields of different structures including the flattened beam can be obtained by changing the coherence width. In addition, by changing the topological charge and power order, the intensity can gather to a point along the ring. These unique properties will have potential applications in particle capture and manipulation, especially in the manipulation of irregular particles.

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Section: Introductionmentioning

confidence: 99%

Tightly focused properties of a partially coherent radially polarized power-exponent-phase vortex beam

Chen

2023

Chinese Phys. B

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“…PEPV has been applied to multi-particle manipulation. [16] The ideal Bessel beam is a non-diffraction beam. [17,18] However, researchers can only generate Bessel-like beams in experiments, such as Bessel-Gaussian (BG) beams, and it is impossible to generate an ideal Bessel beam because its optical field has infinite energy.…”

Section: Introductionmentioning

confidence: 99%

Propagation and focusing characteristics of the Bessel–Gaussian beam with the spiral phase term of new power-exponent-phase

Wang

et al. 2023

Chinese Phys. B

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A new type of beam called the NPEP-BG (a Bessel–Gaussian (BG) beam with a spiral phase term of a new power-exponent-phase (NPEP)) is theoretically studied in this letter. The results show that the number of singularities of the phase and side lobes of the intensity of this beam were equal to the topological charges (TCs) and the beam has the characteristics of self-healing during propagation. The NPEP-BG beam combined the partial characteristics of the new power-exponent-phase vortex (NPEPV) and the Bessel Gaussian beam. At the focus of the beam, the characteristic like a perfect vortex beam was present, in which the focal radius is stable and independent of the topological charge. There are multi-focal spots around a ring in the focal plane, meaning that the NPEP-BG beam has a potential for application in multi-particle manipulation.

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“…In 2017, G. Zhou et al of Zhejiang University of Science and Technology studied the focusing characteristics of radially polarized powerexponent-phase vortex beams based on the vectorial diffraction integral theory, and analyzed the influence of power exponent n and topological charge m on focusing [18]. In 2018, C. Fan et al of Huaqiao University analyzed the strong focusing characteristics of radially polarized power-exponent-phase vortex beams and used them for optical trapping [19]. The research on propagation and tight focusing characteristics of radially polarized power-exponent-phase vortex beam is of great significance to promote its application in optical trapping and other fields.…”

Section: Introductionmentioning

confidence: 99%

Tight focusing properties of vector polarized partially coherent vortex beams

Tang²,

Wan³

et al. 2022

Advanced Laser Processing and Manufacturing VI

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Aiming at tightly focusing vector polarized partially coherent vortex laser beams, this paper introduced a new kind of vortex beams, named radially polarized multi-Gaussian Schell-model (MGSM) power-exponent-phase vortex beam (PEPVB). Based on the vectorial diffraction theory, this work theoretically and numerically investigated the tight focusing properties of radially polarized MGSMPEPVB passing through a high numerical aperture objective lens. Thus, we analyzed the impact of topological charge, power exponent, beam index and coherence length on the intensity of focal zone. We discovered that by increasing beam index, the intensity distribution of focal plane gradually changed from Gaussian to flat-top. Especially, when the power exponent was a non-negative fraction close to 1, regardless of whether the topological charge was an integer or not, the circular symmetry of the focused spot at focal plane would be destroyed, showing a non-uniform and asymmetric central dark core optical intensity distribution. Besides, the value of the fractional part of the topological charge would make the hollow structure of the central dark core fully open due to the introduction of power-exponent phase, which is an improvement over the tight focusing properties of radially polarized MGSM vortex beams. This work has clearly demonstrated that by changing the values of topological charge, power exponent, beam index and coherence length, the special focal spot structures with different intensity distributions including flat-top beam and irregular hollow beam can be obtained, which have many potential applications in laser machining and particle capturing such as manipulation of certain irregular microparticles.

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Trapping two types of particles by using a tightly focused radially polarized power-exponent-phase vortex beam

Cited by 29 publications

References 25 publications

Tightly focused properties of a partially coherent radially polarized power-exponent-phase vortex beam

Tightly focused properties of a partially coherent radially polarized power-exponent-phase vortex beam

Propagation and focusing characteristics of the Bessel–Gaussian beam with the spiral phase term of new power-exponent-phase

Tight focusing properties of vector polarized partially coherent vortex beams

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