Experimental demonstration of twisted light’s diffraction theory based on digital spiral imaging

Zhang, Wuhong; Wu, Ziwen; Wang, Jikang; Chen, Lixiang

doi:10.3788/col201614.110501

Cited by 9 publications

(2 citation statements)

References 32 publications

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“…Many other unique far-field diffraction patterns were investigated through a slit 116 , a square aperture 117 , a diamond-shaped aperture 118 , a circular aperture 119 , an off-axis circular aperture 120 , an isosceles right triangular aperture 121 , a sectorial screen 122 , and so on. The Fresnel diffraction of VBs was also studied 123 . Some special VBs, such as vector VBs 124 and SU(2) VBs 97 , can even bring about special lattice structures in diffraction patterns.…”

Section: Properties Of Ovsmentioning

confidence: 99%

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Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

et al. 2019

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Thirty years ago, Coullet et al. proposed that a special optical field exists in laser cavities bearing some analogy with the superfluid vortex. Since then, optical vortices have been widely studied, inspired by the hydrodynamics sharing similar mathematics. Akin to a fluid vortex with a central flow singularity, an optical vortex beam has a phase singularity with a certain topological charge, giving rise to a hollow intensity distribution. Such a beam with helical phase fronts and orbital angular momentum reveals a subtle connection between macroscopic physical optics and microscopic quantum optics. These amazing properties provide a new understanding of a wide range of optical and physical phenomena, including twisting photons, spin–orbital interactions, Bose–Einstein condensates, etc., while the associated technologies for manipulating optical vortices have become increasingly tunable and flexible. Hitherto, owing to these salient properties and optical manipulation technologies, tunable vortex beams have engendered tremendous advanced applications such as optical tweezers, high-order quantum entanglement, and nonlinear optics. This article reviews the recent progress in tunable vortex technologies along with their advanced applications.

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Section: Properties Of Ovsmentioning

confidence: 99%

“…Far-field diffraction patterns of VBs through a triangular aperture 40 ( c ) and a single slit 116 ( d ). e Near-field diffraction pattern of a VB 123 . f Polarization distribution of vector VBs on the HPS 127 .…”

Section: Properties Of Ovsmentioning

confidence: 99%

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

et al. 2019

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Digital spiral-slit for bi-photon imaging

McLaren

Forbes

2017

J. Opt.

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Quantum ghost imaging using entangled photon pairs has become a popular field of investigation, highlighting the quantum correlation between the photon pairs. We introduce a technique using spatial light modulators encoded with digital holograms to recover both the amplitude and the phase of the digital object. Down-converted photon pairs are entangled in the orbital angular momentum basis, and are commonly measured using spiral phase holograms. Consequently, by encoding a spiral ring-slit hologram into the idler arm, and varying it radially we can simultaneously recover the phase and amplitude of the object in question. We demonstrate that a good correlation between the encoded field function and the reconstructed images exists.

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Trap split with Laguerre-Gaussian beams

Kazemi

Ghanbari

Mahmoudi

2017

J. Opt.

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The optical trapping techniques have been extensively used in physics, biophysics, micro-chemistry, and micromechanics to allow trapping and manipulation of materials ranging from particles, cells, biological substances, and polymers to DNA and RNA molecules. In this Letter, we present a convenient and effective way to generate a novel phenomenon of trapping, named trap split, in a conventional four-level double- atomic system driven by four femtosecond Laguerre-Gaussian laser pulses. We find that trap split can be always achieved when atoms are trapped by such laser pulses, as compared to Gaussian ones. This work would greatly facilitate the trapping and manipulating the particles and generation of trap split. It may also suggest the possibility of extension into new research fields, such as micro-machining and biophysics. Since Ashkin's seminal work on trapping a particle through the use of radiation forces exerted by a Gaussian laser beam [1], the technique of optical trapping has been developed rapidly, becoming an integral tool in variety of different fields to manipulate neutral atoms, nanoparticles, cells, DNA and RNA molecules as well as microsized dielectric particles [2][3][4][5][6][7][8][9][10]. However, as these techniques are based on the optical gradient force which is dependent on the size of the particle [11], smaller particles are much more difficult to trap [12,13], Enhancement of the gradient force by using the femtosecond (fs) pulses could provide an efficient method to address the issue. During recent years, due to the tremendous technological advancement in the generation of fs lasers, there has been a resurgence of interest in this field [14,15] and the optical trapping technologies have been further developed [16][17][18][19][20]. Tamai et al. reported the feasibility of achieving stable laser trapping of water-soluble CdTe quantum dots by using a high repetition-rate picosecond Nd:YLF laser with two orders of magnitude lower than that used in continuous wave laser trapping [17]. Not only does fs laser lead to efficient trapping [16,17], but also it results in discoveries of novel physical phenomena including the deposition of nanostructured CdS films [18] and controlling the direction of the scattered nanoparticles [20].Recently, Okamoto's group observed the stable trapping of 60-nm gold nanoparticles when they are trapped by the fs laser pulses. They have discovered a new trapping phenomenon due to the nonlinear optical effect in which the stable trap site splits into two positions, as the incident peak-laser power approaches a threshold level, named trap split [9]. More recently, Chakraborty and Sarma have shown how to control optical trap potential (OTP) in an N-type four level atomic system by tuning the beam waist of the chirped fs Gaussian pulses and the detuning frequency [21]. They have shown that the potential splits with increasing the Rabi frequency, a behaviour analogous to that in trapping of nonparticles with fs pulses observed in Okamoto's study. In a recent paper by two ...

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Experimental demonstration of twisted light’s diffraction theory based on digital spiral imaging

Cited by 9 publications

References 32 publications

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

Digital spiral-slit for bi-photon imaging

Trap split with Laguerre-Gaussian beams

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