The evolutions of spin density of tightly focused vector fields with spatially-variant uniform and non-uniform ellipticities

Zou, Chao; Huang, Qisheng; Man, Zhongsheng

doi:10.1016/j.optcom.2022.129153

Cited by 4 publications

(1 citation statement)

References 56 publications

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“…[51] For a monochromatic paraxial source field of arbitrary ellipticity, its SoP can be described by the combination by a pair of orthogonal rightand left-handed circularly polarized basis, |R and |L . Here we adopt a unit vector |U to describes the polarization state, as follows: [52][53][54][55][56][57]…”

Section: Theoretical Modelmentioning

confidence: 99%

Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam

Zhu

Man

2023

Chinese Phys. B

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Optical chirality is one of the important and fundamental dynamic properties of light besides energy, momentum and angular momentum. The quantification of electromagnetic chirality has been conceptualized only recently. Now, it is well known that for paraxial plane waves of light, the optical chirality is proportional to the ellipticity of the polarization ellipse, i.e. completely independent of the phase distribution. Here it is shown that optical vortex and state of polarization of the source paraxial field both have contributions to the optical chirality of the nonparaxial field generated by tightly focused Laguerre-Gaussian beam, which is in stark contrast to the paraxial plane wave of light known from classical optics. The physical reason is the redistribution of local electromagnetic polarization in three dimensions associated with spin-orbit interaction.

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Section: Theoretical Modelmentioning

confidence: 99%

Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam

Zhu

Man

2023

Chinese Phys. B

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Temporal effect of the spin-to-orbit conversion in tightly focused femtosecond optical fields

Zhang¹,

Zhou²,

Fu³

et al. 2023

Opt. Express

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Spin and orbital angular momenta are two of the most fundamental physical quantities that describe the complex dynamic behaviors of optical fields. A strong coupling between these two quantities leads to many intriguing spatial topological phenomena, where one remarkable example is the generation of a helicity-dependent optical vortex that converts spin to orbital degrees of freedom. The spin-to-orbit conversion occurs inherently in lots of optical processes and has attracted increasing attention due to its crucial applications in spin–orbit photonics. However, current researches in this area are mainly focused on the monochromatic optical fields whose temporal properties are naturally neglected. In this work, we demonstrate an intriguing temporal evolution of the spin-to-orbit conversion induced by tightly-focused femtosecond optical fields. The results indicate that the conversion in such a polychromatic focused field obviously depends on time. This temporal effect originates from the superposition of local fields at the focus with different frequencies and is sensitive to the settings of pulse width and central wavelength. This work can provide fundamental insights into the spin–orbit dynamics within ultrafast wave packets, and possesses the potential for applications in spin-controlled manipulations of light.

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Magneto-optical-like effect in tight focusing of azimuthally polarized sine-Gaussian beams

Zhang,

Fu,

Man

2024

Opt. Express

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Magneto-optical effects, which have been known for over a century, are among the most fundamental phenomena in physics and describe changes in the polarization state of light when it interacts with magnetic materials. When a polarized plane wave propagates in or through a homogeneous and isotropic transparent medium, it is generally accepted that its transverse polarization structure remains unchanged. However, we show that a strong radial polarization component can be generated when an azimuthally polarized sine-Gaussian plane wave is tightly focused by a high numerical aperture lens, resulting in a magneto-optical-like effect that does not require external magnetic field or magnetic medium. Calculations show that the intensity structure and polarization distribution of the highly confined electric field strongly depend on the parameters m and φ0 in the sinusoidal term, where m can be used to control the number of the multifocal spots and φ0 can be used to control the position of each focal spot. Finally, we show that this peculiar electric field distribution can be used to realize multiple particles trapping with controllable numbers and locations.

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The evolutions of spin density of tightly focused vector fields with spatially-variant uniform and non-uniform ellipticities

Cited by 4 publications

References 56 publications

Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam

Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam

Temporal effect of the spin-to-orbit conversion in tightly focused femtosecond optical fields

Magneto-optical-like effect in tight focusing of azimuthally polarized sine-Gaussian beams

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