Tailoring focused optical vortices by using spiral forked plates

Liang, Yonghao; Wang, Enliang; Li, Hailiang; Xie, Changqing

doi:10.1364/ol.44.000935

Cited by 13 publications

(3 citation statements)

References 25 publications

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“…However, a pattern with larger characteristic angles (i.e. the hexagon) would be better considering the smoothing of corners by electron beam scattering in fabrication process [31,32].…”

Section: Design and Methodsmentioning

confidence: 99%

Single-focus phase singularity generated by spiral zone plate with quasi-random distributed quantum dots

Zang¹,

Miao²,

Liang³

et al. 2022

J. Phys. D: Appl. Phys.

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We report new vortex lens for producing single-focus phase singularity which termed as quasi-random-dot-array binary spiral zone plates (QBSZPs). Different from the abrupt transitions of the conventional spiral zone plates (SZPs), the key idea of the QBSZPs is to realize a sinusoidal transmittance by properly arranging lots of quantum dot array which takes on the values of 0 and 1 in two dimensions. In this typical design, the number density of the selected primitives obeys sinusoidal distribution along the radial direction and quasi-random in the azimuthal direction. Theoretical analysis indicate that the higher-order foci which inevitably exist in the SZPs have been indeed effectively suppressed with the QBSZPs. Moreover, the focusing performance of the QBSZPs is influenced by the ratio of circumcircle diameter of the primitives to the outermost zone width. These findings which have been demonstrated by the performed experiment may direct new avenue towards improving the performance of biomedical imaging, quantum computation and optical manipulation.

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“…However, a pattern with larger characteristic angles (i.e. the hexagon) would be better considering the smoothing of corners by electron beam scattering in fabrication process [31,32].…”

Section: Design and Methodsmentioning

confidence: 99%

Single-focus phase singularity generated by spiral zone plate with quasi-random distributed quantum dots

Zang¹,

Miao²,

Liang³

et al. 2022

J. Phys. D: Appl. Phys.

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show abstract

“…For example, the use of a composite element Ð a spiral fork-shaped plate that combines the SFZP and the forkshaped binary phase grating Ð allows forming two off-axis OV beams with the TC determined by the sum and difference of the TCs of the corresponding SFZP and the fork-shaped grating [176]. A helical axicon with the axicon transmission function modified by a helical phase factor has been demonstrated in several papers [162, 177±179] for the formation of higher-order quasi-Bessel OV beams.…”

Section: Other Types Of Computer-calculated Hologramsmentioning

confidence: 99%

Phase singularities and optical vortices in photonics

et al. 2021

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Since the second half of the 20th century, ideas to develop methods for the formation of optical vortices (OVs) or OV beams Ð regions of circular motion of energy flow in an electromagnetic wave around so-called phase singularity points Ð have become widespread. Such optical beams are unique because of the special spiral shape of the wave front, endowing them with orbital angular momentum (OAM) that can be transferred to matter and cause rotation of nano-and micro-objects. Presently, OV beams are actively used to solve both applied and fundamental problems in optics and photonics. We systematically discuss the development stages and the main advantages and disadvantages of methods for the formation of OV beams, from the appearance of phase singularities in light scattering in inhomogeneous media to the latest developments in vortex microlasers for controlled generation of light fields with a predefined OAM on nano-and microscales.

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“…Xie et al proposed spiral forked plates, which can be obtained by a logic XOR operation between forked gratings (FGs) and spiral zone plates. They create two off-axis optical vortices with tailorable topological charges at the single focal plane [33]. Nevertheless, these kinds of zone plates cannot generate a series of optical vortices at multiple focal planes and have no optical vortices along the optic axis.…”

Section: Introductionmentioning

confidence: 99%

Three tailorable optical vortices generated by a modified fractal spiral forked plate

Xia¹,

Cheng²,

Yu³

et al. 2021

J. Opt.

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A modified fractal spiral forked plate (MFSFP) is proposed to generate three tailorable coplanar optical vortices at multiple focal planes, which consist of two off-axis vortices and one axial vortex. The axial vortex and one low-intensity off-axis vortex can have equal intensity by designing an appropriate spiral-like filter. In addition, the MFSFP has self-similar axial and off-axis optical vortices. Moreover, the tailorable topological charges of two off-axis vortices are related to those of the fractal spiral zone plate (FSZP) and forked grating and the topological charge of the axial vortex is equal to that of the FSZP. In the experiments, based on the interferometric measurement method, the differences between fingers of forked fingers are used to prove the above topological charge transformation rule. The method of constructing the MFSFP is illustrated. The MFSFP is applicable to rotate particles at multiple positions of the different planes simultaneously, increase optical communication capacities and produce multiple images simultaneously.

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Tailoring focused optical vortices by using spiral forked plates

Cited by 13 publications

References 25 publications

Single-focus phase singularity generated by spiral zone plate with quasi-random distributed quantum dots

Single-focus phase singularity generated by spiral zone plate with quasi-random distributed quantum dots

Phase singularities and optical vortices in photonics

Three tailorable optical vortices generated by a modified fractal spiral forked plate

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