Conservation of the spin angular momentum in second-harmonic generation with elliptically polarized vortex beams

Li, Tianyu; Gu, Bing; Rui, Guanghao; Lv, Changgui; He, Jun; Cui, Yiping

doi:10.1063/1.5087019

Cited by 6 publications

(9 citation statements)

References 42 publications

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“…Nanoscale particles can be endocytosed by biological cells and manipulated intracellularly across a cell membrane. Owing to the enhancement of the electromagnetic field, label-free Raman spectral signals can be detected from inside the cell interaction have also unfolded as an attractive prospect [355][356][357] . Such nonlinear plasmon-matter interactions will likely play an important role in future applications (Fig.…”

Section: Nonlinear Plasmon-matter Interactionsmentioning

confidence: 99%

“…When a femtosecond optical pulse is incident on a metal surface, it might disturb the equilibrium in the energy–momentum distribution of electrons and thereby influence plasmonic excitation and propagation along the surface 352 – 354 . Furthermore, harmonic spin–orbit angular momentum coupling and its interaction have also unfolded as an attractive prospect 355 – 357 . Such nonlinear plasmon–matter interactions will likely play an important role in future applications (Fig.…”

Section: Prospectsmentioning

confidence: 99%

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Plasmonic tweezers: for nanoscale optical trapping and beyond

et al. 2021

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Optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small objects. More recently, the possibility of performing manipulation with surface plasmons has opened opportunities not feasible with conventional far-field optical methods. The use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength; with this confinement, the plasmonic field facilitates trapping of various nanostructures and materials with higher precision. The successful manipulation of small particles has fostered numerous and expanding applications. In this paper, we review the principles of and developments in plasmonic tweezers techniques, including both nanostructure-assisted platforms and structureless systems. Construction methods and evaluation criteria of the techniques are presented, aiming to provide a guide for the design and optimization of the systems. The most common novel applications of plasmonic tweezers, namely, sorting and transport, sensing and imaging, and especially those in a biological context, are critically discussed. Finally, we consider the future of the development and new potential applications of this technique and discuss prospects for its impact on science.

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Section: Nonlinear Plasmon-matter Interactionsmentioning

confidence: 99%

Section: Prospectsmentioning

confidence: 99%

Plasmonic tweezers: for nanoscale optical trapping and beyond

et al. 2021

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“…Topics studied included the characteristics of a radially polarized electromagnetic field at the strong focus [ 2 , 3 , 4 , 5 ], and spin-orbital conversion at the strong focus of a circularly polarized wave [ 6 , 7 , 8 , 9 ]. Tightly focusing an elliptically polarized optical vortex has been studied [ 10 , 11 , 12 , 13 ], and a concept of cylindrical vector beams has been proposed [ 14 ], including both radially and azimuthally polarized beams. Studies of the focusing of promising beams with hybrid polarization have also been conducted [ 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Spin-Orbital Conversion of a Strongly Focused Light Wave with High-Order Cylindrical–Circular Polarization

Kotlyar

Stafeev

Козлова

et al. 2021

Sensors

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We discuss interesting effects that occur when strongly focusing light with mth-order cylindrical–circular polarization. This type of hybrid polarization combines properties of the mth-order cylindrical polarization and circular polarization. Reluing on the Richards-Wolf formalism, we deduce analytical expressions that describe E- and H-vector components, intensity patterns, and projections of the Poynting vector and spin angular momentum (SAM) vector at the strong focus. The intensity of light in the strong focus is theoretically and numerically shown to have an even number of local maxima located along a closed contour centered at an on-axis point of zero intensity. We show that light generates 4m vortices of a transverse energy flow, with their centers located between the local intensity maxima. The transverse energy flow is also shown to change its handedness an even number of times proportional to the order of the optical vortex via a full circle around the optical axis. It is interesting that the longitudinal SAM projection changes its sign at the focus 4m times. The longitudinal SAM component is found to be positive, and the polarization vector is shown to rotate anticlockwise in the focal spot regions where the transverse energy flow rotates anticlockwise, and vice versa—the longitudinal SAM component is negative and the polarization vector rotates clockwise in the focal spot regions where the transverse energy flow rotates clockwise. This spatial separation at the focus of left and right circularly polarized light is a manifestation of the optical spin Hall effect. The results obtained in terms of controlling the intensity maxima allow the transverse mode analysis of laser beams in sensorial applications. For a demonstration of the proposed application, the metalens is calculated, which can be a prototype for an optical microsensor based on sharp focusing for measuring roughness.

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“…In particular the studies of structured light beams and their propagation through different media, especially uniaxial * Author to whom any correspondence should be addressed. crystals, has attracted much attention, particularly in the last few decades [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Polarization-based transformations of linearly polarized quasi-Gaussian beams propagating in uniaxial crystals at an arbitrary angle

Albadry¹,

Nawareg²,

El-Din³

2021

J. Opt.

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Studying the polarization of paraxial beams propagating through uniaxial anisotropic crystals at an arbitrary angle is a powerful feature to extend the range of utilization of these crystals. In this paper, we derive a general theoretical model, based on the existing theory, to describe the transformations of polarization state in cases of arbitrary beam propagation. Stokes parameters are employed for the determination of polarization state of the light beam. The derived model is applied to a linearly polarized quasi-Gaussian beam propagating through rutile crystal. The dependence of the polarization state of the beam on many parameters such as beam waist, angle of propagation, and thickness of the crystal is investigated. The variation of each of these parameters leads to an extensive and interesting change of the polarization state. Moreover, the results are employed to observe the variations of the spin angular momentum as a function of the above-mentioned parameters. Furthermore, we report on an interesting result regarding the longitudinal component of the propagating field, where we noticed the existence of clearly non negligible values of this component for certain propagation parameters. The results of the current work are promising and can be utilized to obtain the best functioning of the output beam depending on its shape and polarization. In addition, they are promising for other future applications such as designing polarization-based devices which are useful in many fields.

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Conservation of the spin angular momentum in second-harmonic generation with elliptically polarized vortex beams

Cited by 6 publications

References 42 publications

Plasmonic tweezers: for nanoscale optical trapping and beyond

Plasmonic tweezers: for nanoscale optical trapping and beyond

Spin-Orbital Conversion of a Strongly Focused Light Wave with High-Order Cylindrical–Circular Polarization

Polarization-based transformations of linearly polarized quasi-Gaussian beams propagating in uniaxial crystals at an arbitrary angle

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