Grafted optical vortex with controllable orbital angular momentum distribution

Zhang, Hao; Li, Xinzhong; Ma, Haixiang; Tang, Miaomiao; Li, Hehe; Tang, Jie; Cai, Yangjian

doi:10.1364/oe.27.022930

Cited by 67 publications

(20 citation statements)

References 33 publications

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“…We have reviewed the remarkable progress that has been made in this field, including optical trapping in suspension and air/vacuum, optical transporting of metal nanoparticles, and the biomedical application of optical trapping. It is clear that optical tweezers will evolve as beam shaping technologies evolve, for example, tractor beams, [177][178][179][180][181][182]242 anomalous vortex beams, 243,244 partially coherent vortex beams, 245,246 grafted vortex beams, 247,248 and structured light with photonic and plasmonic structures. [249][250][251][252][253] There is no doubt that new developments in structured light beams will continuously boost the fields of optical manipulation.…”

Section: Discussionmentioning

confidence: 99%

Optical trapping with structured light: a review

et al. 2021

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Optical trapping describes the interaction between light and matter to manipulate micro-objects through momentum transfer. In the case of 3D trapping with a single beam, this is termed optical tweezers. Optical tweezers are a powerful and noninvasive tool for manipulating small objects, and have become indispensable in many fields, including physics, biology, soft condensed matter, among others. In the early days, optical trapping was typically accomplished with a single Gaussian beam. In recent years, we have witnessed rapid progress in the use of structured light beams with customized phase, amplitude, and polarization in optical trapping. Unusual beam properties, such as phase singularities on-axis and propagation invariant nature, have opened up novel capabilities to the study of micromanipulation in liquid, air, and vacuum. We summarize the recent advances in the field of optical trapping using structured light beams.

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Section: Discussionmentioning

confidence: 99%

Optical trapping with structured light: a review

et al. 2021

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“…A grafted optical vortex, which is generated through grafting two or more spiral phase profiles of optical vortex beams, has a controllable OAM distribution and constant intensity. [ 13 ] Recently, grafted perfect vortex beams (GPVBs) have attracted much attention due to their unique optical properties (e.g., versatile OAM distributions) and potential applications (e.g., more options for particle manipulation). However, the generation and manipulation of GPVBs are more challenging and complicated due to the involvement of an additional phase profile of a lens and that of an axicon.…”

Section: Introductionmentioning

confidence: 99%

Multichannel Superposition of Grafted Perfect Vortex Beams

et al. 2022

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The OV beam can be converted into a doughnut-shaped ring with the transverse component of Poynting vectors. Owing to the azimuthally dependent phase, an OV beam possesses an orbital angular momentum (OAM), which plays a vital role in various applications such as optical communications, [2] optical imaging, [3] particle manipulation, [4] and OAM microlasers. [5] The diameter of the light ring is strongly dependent on the TC, hindering the coupling of multiple OVs in an optical fibre. [6] To solve this problem, Ostrosky et al. proposed the concept of the perfect optical vortex (POV), [7] which exhibits a constant intensity profile and a radius irrespective of the TC. [8,9] For conventional OV and POV beams, the OAM distribution on the ring is uniform. This uniformity is not suitable for applications where versatile OAM distributions are needed, e.g., multiparticle trapping and manipulation. Therefore, noncanonical optical vortices are proposed to tackle these challenges. Examples include spiral OAM distributions, [10] nonuniform hollow circular OAM distributions, [11] and structured OAM distributions. [12] However, these OAM distributions are strongly dependent on the intensity and the local OAM modulation is impossible. A grafted optical vortex, which is generated through grafting two or more spiral phase profiles of optical vortex beams, has a controllable OAM distribution and constant intensity. [13] Recently, grafted perfect vortex beams (GPVBs) have attracted much attention due to their unique optical properties (e.g., versatile OAM distributions) and potential applications (e.g., more options for particle manipulation). However, the generation and manipulation of GPVBs are more challenging and complicated due to the involvement of an additional phase profile of a lens and that of an axicon. The optical setups currently being used for generating GPVBs are complex, requiring numerous optical components, including spatial light modulators, lenses, pinhole filters, polarizers, and dichroic mirrors, [13] which result in large space requirement and high cost. These optical systems are impractical for many applications, and hence there is a pressing requirement for a compact, simple, and efficient approach to generating and manipulating GPVBs.Optical metasurfaces have been used in a range of ultrathin optical devices, including metalenses, [14][15][16][17][18] polarization detectors, [19][20][21] holograms, [22][23][24][25] and high-resolution imaging. [26,27]

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“…Because OAM has an infinite discrete value space, it can be used in large-capacity optical communications [2] ,and the spiral phase structure and a dark hollow ring light intensity distribution makes it applicable in the field of optical micro-manipulation [3] .Especially it used in OAM multiplexing communication, when the channel terminal demultiplexs the information, and it needs to determine the OAM mode in the current optical field.Therefore,measuring the OAM mode is the key to the application based on vortex beam. Scholars have completed a lot of research on the detection of OAM mode,currently there are two main types of detection methods,one is the Interference method [4][5][6] , which interferes with the vortex beam and another reference beam, and judges the OAM mode by the interference pattern characteristics obtained, however, any slight fluctuations related to the beam can easily cause the interference pattern to be unstable, this kind of method has high requirements on the experimental optical path; Another type of detection method is based on diffraction optical elements method , which is to pass the vortex beam through the aperture such as double slits [7] , triangular holes [8] , the ring gratings [9,10] , then judge the OAM mode according to the characteristics of the diffracted spot.…”

Section: Introductionmentioning

confidence: 99%

Measuring the orbital angular momentum mode of vortex beam based on phase matching sequence

Xue

2022

J. Phys.: Conf. Ser.

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Measuring the orbital angular momentum(OAM) mode of vortex beams is of great significance in applications based on vortex beams.we propose a method of phase matching characteristics of vortex beams to measure the OAM mode. The method first use a high-speed spatial light modulator(SLM) to sequentially load a set of helical phase sequence images, so that the vortex beam is modulated by this SLM. Then obtain the modulated optical field through pinhole filtering, and then the synchronized tilt phase modulation is performed by the 4f system and high-speed SLM. When the OAM mode of vortex beam is opposite to the topological charge of helical phase image, that is, the incident vortex beam degenerates to the fundamental Gaussian mode beam,and through our optical system, the output plane obtained a indicating spot with the position related to the OAM mode. The Simulation and experimental results show that the method obtains a clear OAM mode indicating spot on the final output plane, which verifies the theoretical derivation.

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Grafted optical vortex with controllable orbital angular momentum distribution

Cited by 67 publications

References 33 publications

Optical trapping with structured light: a review

Optical trapping with structured light: a review

Multichannel Superposition of Grafted Perfect Vortex Beams

Measuring the orbital angular momentum mode of vortex beam based on phase matching sequence

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