Spin-orbit coupling affecting the evolution of transverse spin

Eismann, Jörg S.; Banzer, Peter; Neugebauer, Martin

doi:10.1103/physrevresearch.1.033143

Cited by 31 publications

(33 citation statements)

References 40 publications

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“…2b exhibit very similar spatial distributions, in agreement with the dual-symmetric nature of the transverse spin for unpolarized light: S ⊥ (e) = S ⊥ (m) = S ⊥ / 2 (see SI). The same feature is present in nonparaxial fields with welldefined helicity [11], such as fields obtained by focusing circularly polarized input light [41]. However, in our case of an unpolarized source, the helicity and longitudinal spin vanish.…”

Section: Focused-beam Experimentssupporting

confidence: 64%

Transverse spinning of unpolarized light

et al. 2020

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It is well known that spin angular momentum of light, and therefore that of photons, is directly related to their circular polarization. Naturally, for totally unpolarized light, polarization is undefined and the spin vanishes. However, for nonparaxial light, the recently discovered transverse spin component, orthogonal to the main propagation direction, is largely independent of the polarization state of the wave.Here we demonstrate, both theoretically and experimentally, that this transverse spin survives even in nonparaxial fields (e.g., tightly focused or evanescent) generated from a totally unpolarized light source. This counterintuitive phenomenon is closely related to the fundamental difference between the degrees of polarization for 2D paraxial and 3D nonparaxial fields. Our results open an avenue for studies of spinrelated phenomena and optical manipulation using unpolarized light.

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Section: Focused-beam Experimentssupporting

confidence: 64%

Transverse spinning of unpolarized light

et al. 2020

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“…[ 157 ] Following these pioneering works, by using a similar experimental method, the orbital‐to‐spin AM conversion [ 158 ] and the evolution of transverse spin have also been demonstrated. [ 159 ]…”

Section: Characterization Of Psois In the Far‐field Wavesmentioning

confidence: 99%

Probing and Imaging Photonic Spin‐Orbit Interactions in Nanostructures

Cui

Sun

Bai

et al. 2021

Laser & Photonics Reviews

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Photonic spin‐orbit interactions (PSOIs) in nanostructures have attracted much interest in nanophotonics, which provide a new paradigm to enhance light‐matter interactions and engineer the wavefronts of light on demand at the nanoscale. Many striking phenomena and functionalities, such as the photonic (quantum) spin‐Hall effect and the spin‐vortex conversion, have been demonstrated. Besides their underlying physics and manifestations, the experimental probing and imaging of PSOIs are also of great importance and highly demanded in not only the fundamental research but also the development of emerging PSOI technologies. Hence, in this review, the state‐of‐the‐art studies on the experimental observations and detections of PSOIs are systematically reviewed, including both the far‐field and near‐field methods. The respective advantages and difficulties of each method are stated and analyzed. The perspectives in probing PSOIs are also discussed.

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“…With the divergence of the curl being zero, the spin flow s P does not transfer energy but is still a physically meaningful quantity that can be measured [4,18]. In dipole approximation, the scattering force sc F acting upon a Rayleigh particle is proportional to the orbital energy flow o P [13][14][15]:…”

Section: Poynting Vector (Energy Flow)mentioning

confidence: 99%

“…The spin flow is the curl of the spin vector and, therefore, does not transfer the energy. At the same time, the spin flow and the proper spin vector are both measurable quantities [4,18].…”

Section: Introductionmentioning

confidence: 99%

Orbital Energy and Spin Flows in a Strong Focus of Laser Light

2020

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In this work, we derive analytical relations for all projections of the orbital energy flow and spin flow in the focal plane of a strongly focused left-hand circularly polarized Gaussian beam, also calculating a torque exerted upon a dielectric ellipsoidal microparticle in the focus of the beam and discussing results of an experiment on rotating the microparticle around its center of mass. The on-axis projection of the torque exerted upon the microparticle is found to be negative, i.e. directed oppositely to the beam propagation axis. Such a torque is supposed to induce a clockwise rotation of a non-absorbing dielectric particle around its center of mass. We have been demonstrated that a reverse energy flow occurs in the light field regions where the longitudinal projection of the spin flow is negative and larger in magnitude than the longitudinal projection of the orbital energy flow, which is always positive.

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Spin-orbit coupling affecting the evolution of transverse spin

Cited by 31 publications

References 40 publications

Transverse spinning of unpolarized light

Transverse spinning of unpolarized light

Probing and Imaging Photonic Spin‐Orbit Interactions in Nanostructures

Orbital Energy and Spin Flows in a Strong Focus of Laser Light

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