Orbital motion of spherical microparticles trapped in diffraction patterns of circularly polarized light
Abstract
We investigate arrays and rotation of spherical microparticles trapped by focusing a circularly polarized Gaussian beam just above the top coverslip-water interface. Particles are trapped in various patterns due to a Fresnel diffraction, such as rings and close-packed structures. We find that rings of particles orbit around the beam axis, whereas close-packed arrays spin in the opposite sense on the beam axis. The sense of the orbiting, as well as that of the spinning, is determined by the input circular polarization handedness. The results are interpreted on the assumption that the spin angular momentum carried by a circularly polarized beam is converted into the orbital angular momentum in the optical process by which the focused Gaussian beam's shape is transformed due to diffraction.
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This helicity-dependent switching of the central intensity was observed in experiments and employed for spin-controlled transmission of light via chiral nanoapertures and AM-induced circular dichroism in non-chiral structures.
“This helicity-dependent switching of the central intensity was observed in experiments 20,25 and employed for spin-controlled transmission of light via chiral nanoapertures 104 and AM-induced circular dichroism in non-chiral structures 105 .”
From Spin–orbit interactions of light (2015) · cites this paper as [25]
Focusing circularly-polarized light by a high-numerical-aperture lens generates a spin-dependent optical vortex in the focal field.
“(ii) Focusing of circularly-polarized light by a high-numerical-aperture lens results in the generation of a spin-dependent optical vortex (i.e., helical phase producing orbital angular momentum) in the focal field.”
From Spin–orbit interactions of light (2015) · cites this paper as [25]
For the largest aperture angle θ=π/2, the conversion efficiency reaches 100%, i.e., all the paraxial SAM becomes part of IOAM.
“For the largest aperture angle θ = π / 2 , Φ G0 = 2 π , and the conversion efficiency reaches 100%, i.e., all the paraxial SAM becomes part of IOAM 25 .”
From Spin–orbit interactions of light (2015) · cites this paper as [25]
For vortex beams with l=1, the z-component of the field has vortex charge l+σ; for lσ=1 this component is a charge-2 vortex with vanishing intensity in the center, while for lσ=-1 it is a charge-0 vortex with maximum intensity in the center.
“The most striking manifestation of this effect appears for vortex beams with = 1, Fig. 2c. According to the transformation (4), the z -component of the field has the vortex charge +σ . Therefore, for σ = 1 this component represents a charge-2 vortex with vanishing intensity in the beam center, while for σ = -1 this is a charge-0 vortex with maximum intensity in the center.”
From Spin–orbit interactions of light (2015) · cites this paper as [25]
Chiral structures can generate a spin-dependent intensity plasmonic distribution with vortices.
“In particular, chiral structures can generate a spin-dependent intensity plasmonic distribution with vortices 25,122,123 ,”
From Spin–orbit interactions of light (2015) · cites this paper as [25]
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References 24 · Cited by 39
- Authors
- Adachi, H., Akahoshi, S., & Miyakawa, K.
- Affiliations
- Fukuoka University (JP)
- ORCID
- Adachi, Hiroto
- Venue
- Physical Review A
- Publisher
- American Physical Society (APS)
- Published
- 2007-06-07
- Volume
- 75
- Issue
- 6
- ISSN
- 0556-2791 (ISSN-L)
- 1050-2947
- 1094-1622
- OpenAlex
- W2081963440
- Cited by
- 39
- References
- 24
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 2 · 2022: 2 · 2021: 5 · 2020: 1 · 2019: 4 · 2018: 2 · 2017: 2 · 2016: 3 · 2015: 4 · 2014: 1 · 2013: 1
- FWCI
- 1.02
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review A (publishedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Orbital Angular Momentum in Optics
- Physical Sciences › Engineering › Biomedical Engineering › Microfluidic and Bio-sensing Technologies
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Digital Holography and Microscopy
- Keywords
- optical trapping, circularly polarized light, Fresnel diffraction, spherical microparticles, orbital angular momentum, spin angular momentum, topological charge, particle rotation, ring patterns, polarization handedness, Gaussian beam focusing, water interface
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