Investigating the propagation characteristics of modulated circular Airy vortex beam in free space via angular spectrum method

Liu, Houquan; Pu, Huilin; Zhang, Jiawen; Jiao, Yuhan; Xu, Ronghui; Yang, Hongyan; Yuan, Libo

doi:10.1016/j.optcom.2022.129087

Cited by 6 publications

(2 citation statements)

References 33 publications

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“…Only polarization was supposed to be inhomogeneous. As a future work, light fields can be studied with the double-index polarization singularity, but with an inhomogeneous amplitude or/and phase distribution, like, for instance, circular Airy beams with vortices [ 18 , 19 , 20 ] or quadratic-power-exponent-phase vortex beams [ 21 , 22 ]. These beams were studied in homogeneous medium [ 18 ], uniaxial crystals [ 19 , 21 ], or in tight focusing conditions [ 20 , 22 ], but their tight focusing with double-index polarization singularities and the possibility of the optical spin Hall effect in the tight focus were not yet investigated.…”

Section: Discussionmentioning

confidence: 99%

Spin Hall Effect of Double-Index Cylindrical Vector Beams in a Tight Focus

Kovalev

Kotlyar

2023

Micromachines

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We investigate the spin angular momentum (SAM) of double-index cylindrical vector beams in tight focus. Such a set of beams is a generalization of the conventional cylindrical vector beams since the polarization order is different for the different transverse field components. Based on the Richards-Wolf theory, we obtain an expression for the SAM distribution and show that if the polarization orders are of different parity, then the spin Hall effect occurs in the tight focus, which is there are alternating areas with positive and negative spin angular momentum, despite linear polarization of the initial field. We also analyze the orbital angular momentum spectrum of all the components of the focused light field and determine the overwhelming angular harmonics. Neglecting the weak harmonics, we predict the SAM distribution and demonstrate the ability to generate the focal distribution where the areas with the positive and negative spin angular momentum reside on a ring and are alternating in pairs, or separated in different semicircles. Application areas of the obtained results are designing micromachines with optically driven elements.

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Section: Discussionmentioning

confidence: 99%

Spin Hall Effect of Double-Index Cylindrical Vector Beams in a Tight Focus

Kovalev

Kotlyar

2023

Micromachines

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“…The concept of circular Airy beam was initially proposed theoretically in 2010 [11] and subsequently confirmed experimentally in 2011 [12]. Due to their inherent selffocusing nature, circular Airy beam have garnered considerable attention for their applications in biological processing, material processing, and nonlinear optical processes [13]. Over the years, numerous studies have been conducted on various aspects of circular Airy beams, including their generation [14][15][16], modulation [17][18][19], transmission [20,21], and application [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Fiber end integrated surface plasma lens for circular airy beam shaping

Xu,

Wang,

Yuan

et al. 2024

Phys. Scr.

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This paper presents a circular Airy beam generator based on a fiber end integrated surface plasma lens. The surface plasma lens consists of a nano-annular slot and an array of series concentric circular grooves etched on the gold film coated on the fiber end. When the fiber light field illuminates the nano-annular slot, surface plasmon polaritons (SPPs) will be excited, then the SPPs propagates along the surface of the gold film, and will finally be decoupled into free space to generate circular Airy beam by the array of concentric circular grooves. The effect of the parameters of the plasma lens on the properties of the output circular Airy beam, such as self-focusing, focal spot size, is studied in detail via FDTD simulations. In addition, we found that the proposed plasma lens has a high tolerance to manufacturing errors. The case that instead of the nano-annular slit with a circular wheat-spike shaped structure is also investigated. In this case, due to the different photon spin response of the circular wheat-spike shaped structure, the device can generate circular Airy beam when the input fiber light field is right-handed circularly polarized (RHCP) light, and subwavelength Bessel-like nondiffracting beam when the input fiber light field is left-handed circularly polarized (LHCP) light. These results provide a highly integrated all-fiber circular Airy beam and subwavelength Bessel-like nondiffracting beam generation scheme, which may be useful in the areas of fiber end structured light beam shaping and fiber-integrated photonic devices.

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