In situ measurement of the topological charge of a perfect vortex using the phase shift method

Ma, Haixiang; Li, Xinzhong; Tai, Yuping; Li, Hehe; Wang, Jingge; Tang, Miaomiao; Wang, Yishan; Tang, Jie; Nie, Zhaogang

doi:10.1364/ol.42.000135

Cited by 81 publications

(32 citation statements)

References 45 publications

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“…proposed the concept of “perfect optical vortex” (POV), whose bright ring radius is independent of the TCs. Subsequently, POV generation methods and properties were studied in detail in some studies . Further, POV lattices were generated to different n th diffraction orders of the spatial light modulator (SLM), which represents the magnitude and sign of the TC of each POV .…”

Section: Introductionmentioning

confidence: 99%

Generation of Circular Optical Vortex Array

Tai

et al. 2017

Annalen der Physik

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We report on a novel optical vortex array named circular optical vortex array, which is generated by the superposition of two concentric perfect optical vortices. The circular optical vortex array has a constant topological charge of +1 or −1, the number and sign of which are determined by the topological charges of the two perfect optical vortices. Moreover, the radius of the circular optical vortex array is easily adjusted by using the cone angle of an axicon. Furthermore, the circular optical vortex array and multiple circular optical vortex array can be rotated by changing the initial phase difference of the perfect optical vortices on demand. This work demonstrates a complex structured optical field, which is of significance for applications such as optical tweezers, micro-particle manipulation, and optical imaging.

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Section: Introductionmentioning

confidence: 99%

Generation of Circular Optical Vortex Array

Tai

et al. 2017

Annalen der Physik

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“…Where, the annular spiral phase (

l_{i} θ + α r

) can realize to offset radially the optical vortex by radial shift factor α (i.e., the optical vortex shrinks for

α > 0

or expands for

α < 0

). [ 30 ] Superimposing an equiphase ( γ ) over the annular spiral phase is equivalent to a vortex beam interfering with a reference beam, [ 30 ] resulting in an annular twisting lobes intensity pattern, as shown in Figure 3b1. Consequently, the role of an equiphase is regarded as a reference Gaussian beam.…”

Section: Theorymentioning

confidence: 99%

Tunable Polycyclic Chiral Beams

2020

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The generation of polycyclic chiral beams by inducing annular spiral zone phases that consist of multiple subphases is numerically and experimentally demonstrated. Each subphase is composed of a spiral phase, an equiphase, and a radial phase. The number and twisting direction of the spiral intensity lobes for every layer could be individually controlled. Furthermore, the orientations for the twisting lobes could be tuned by changing the introduced equiphase gradient. More importantly, such optical fields also show rotation property when the equiphases with gradient are dynamically and continuously imposed. This advantage of rotation also brings about the possibility of such chiral beams to rotate particles. Such beams would be advantageous for manufacturing tunable chiral metamaterials and have potential applications in optical tweezers and optical communication.

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“…However, it seems that the diffraction methods [26]- [28] used to measure the TCs of the ordinary OV are not suitable for the POV. This is because, during the generation of the POV, it appears only in the near proximity of the Fourier plane of a spatial light modulator (SLM) [29]. Therefore, a traditional method is used to measure the TCs of the POV by the interference between a POV beam and a spherical beam [30], [31], but this method requires some specialized optical components with fine alignment and the accuracy of the experimental optical path.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a traditional method is used to measure the TCs of the POV by the interference between a POV beam and a spherical beam [30], [31], but this method requires some specialized optical components with fine alignment and the accuracy of the experimental optical path. To address this problem, Ma et al reported an improved method to measure the POV beam with phase shift technique [29], which can overlap and interfere exactly between the POV beam and its phase conjugate in an approximately Fourier plane. This method can determine the TCs of a POV with simple and non-precise optical elements, but its energy efficiency is relatively low and it even has severe distortions of far-field intensity patterns when measuring the high-order POV beam.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Angular Gradient Phase Grating for Measuring the Orbital Angular Momentum of Perfect Optical Vortex Beams

et al. 2020

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We propose an effective method to measure the orbital angular momentum of a perfect optical vortex (POV) beam with a hybrid angular gradient phase grating (HAG-PG), which is a gradient grating with angular changing distribution. The HAG-PG performs the transformation from the POV to the dark stripes of the diffraction intensity patterns. From the number and the orientation of dark stripes of far-field diffraction patterns formed by the HAG-PG, the modulus of TC and sign of the incident POV beam can be determined. The high scalability of this method for being unrestricted by the Fourier plane and its adaptation for measuring the POV beams with different states are demonstrated by loading the HAG-PG hologram on a spatial light modulator. And the detection sensitivity of the POV beam can be significantly improved. The experimental results agree well with the theoretical simulations.

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In situ measurement of the topological charge of a perfect vortex using the phase shift method

Cited by 81 publications

References 45 publications

Generation of Circular Optical Vortex Array

Generation of Circular Optical Vortex Array

Tunable Polycyclic Chiral Beams

Hybrid Angular Gradient Phase Grating for Measuring the Orbital Angular Momentum of Perfect Optical Vortex Beams

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