Cited by 44Orbital Angular Momentum in OpticsMetamaterials and Metasurfaces ApplicationsQuantum and Classical Electrodynamics

Manifestations of geometric phase and enhanced spin Hall shifts in an optical trap

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Roy, Basudev, Ghosh, Nirmalya, Banerjee, Ayan, Gupta, Subhasish Dutta, Roy, Soumyajit·2014·New Journal of Physics

Abstract

The spin orbit interaction (SOI) of light has been the focus of recent research due to the fundamental consequences and potential applications in diverse systems, ranging from inhomogeneous anisotropic media to engineered plasmonics and metamaterial strutures. Here, we demonstrate perhaps one of the simplest means to study SOI and the spin Hall shift (SHS) using a standard Gaussian TEM 00 beam in an optical trap. Our system exploits the versatility and interference generated in a stratified medium to control and manipulate SOI and transfer the resulting angular momentum to optically trapped microparticles. We show that even such a simple setup can lead to an order of magnitude enhancement in the SHS compared to the subwavelength shifts typically obtained. Importantly, this leads to the generation of doughnut-like mode structures from a fundamental Gaussian beam, as well as controlled rotation of mesoscopic particles using a linearly polarized Gaussian beam that lacks intrinsic angular momentum. The local optical torque leading to rotation of the particles is a direct measure of the local spin angular momentum (SAM) density of the field. Our measurement is the first experimental demonstration of using a probe particle to measure the SAM density for nonparaxial fields.

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Crossref · 10.1088/1367-2630/16/8/083037

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  • Properly designing anisotropic and inhomogeneous structures allows considerable enhancement of SOI effects and highly efficient spin-dependent shaping and control of light.

    “Moreover, properly designing anisotropic and inhomogeneous structures (e.g., metasurfaces or liquid crystals) allows considerable enhancement of the SOI effects and highly efficient spindependent shaping and control of light 37- 45 .”

    From Spin–orbit interactions of light (2015) · cites this paper as [39]

    The Abstract and Discussion (page unavailable) report that a stratified optical trap enhances spin–orbit interaction and produces polarization-dependent beam patterns. They do not establish the broader claim for metasurfaces or liquid crystals, or quantify the shaping and control of light as ‘highly efficient.’ (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • For a planar anisotropic element (transparent retarder with phase δ and anisotropy axis at angle α), the Jones-matrix transformation of wave polarization becomes (5), with off-diagonal elements originating from geometric phases induced by rotation of coordinates.

    “Performing a rotation by the angle α to the laboratory coordinate frame and also writing this matrix in the helicity basis of right-hand and left-hand circular polarizations, the Jones-matrix transformation of the wave polarization becomes 5,6,37- 39,114”

    From Spin–orbit interactions of light (2015) · cites this paper as [39]

    Split into 2 atoms — 0 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 1 unverifiable. Expand the claim to see per-atom verdicts.

    Experimental — accuracy not yet measured
  • The fundamental mechanisms underlying spin-dependent deformation of optical fields are geometric phases.

    “Most importantly, the fundamental mechanisms underlying the spin-dependent deformation of optical fields are geometric phases (see Box 2).”

    From Spin–orbit interactions of light (2015) · cites this paper as [39]

  • The off-diagonal geometric-phase elements of Eq. (5) offer helicity-dependent manipulation of light using the orientation of the anisotropy axis; anisotropic subwavelength gratings with space-variant orientation have been employed for geometric-phase-induced shaping of light.

    “The off-diagonal geometric-phase elements of Eq. (5) offer helicity-dependent manipulation of light using the orientation of the anisotropy axis. In particular, anisotropic subwavelength gratings with space-variant orientation α = α x , y ( ) have been employed for the geometric-phase-induced shaping of light 5,6,37- 39,41,114- 117 .”

    From Spin–orbit interactions of light (2015) · cites this paper as [39]

    Split into 2 atoms — 0 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 2 unverifiable. Expand the claim to see per-atom verdicts.

    Experimental — accuracy not yet measured

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Research works printed but not linked: 2

  1. Cohen-Tannoudji C, Diu B and Laloë F 2005 Quantum Mechanics vol 2 (Weinheim: Wiley-VCH)
  2. Born M and Wolf E 1989 Principles of Optics (Oxford: Pergamon)

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Authors
Roy, B., Ghosh, N., Banerjee, A., Gupta, S. D., & Roy, S.
Affiliations
  • Indian Institute of Science Education and Research Kolkata (IN)
  • University of Hyderabad (IN)
Venue
New Journal of Physics
Published
2014-08-21
Volume
16
Issue
8
Pages
083037
ISSN
1367-2630 (ISSN-L)
OpenAlex
W2054271866
Cited by
43
References
51
Citations by year
2026: 2 · 2025: 4 · 2024: 4 · 2023: 4 · 2022: 6 · 2021: 7 · 2020: 7 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 3 · 2014: 1
FWCI
1.00
Type
journal article
Language
en
Open access
Locations
  • New Journal of Physics (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • Indian Institute of Science
  • Department of Science and Technology, Ministry of Science and Technology, India
  • Ministry of Education, India
  • Indian Institute of Science Education and Research Mohali
  • Board of Research in Nuclear Sciences
  • Division of Human Resource Development
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Orbital Angular Momentum in Optics
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Metamaterials and Metasurfaces Applications
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum and Classical Electrodynamics
Keywords
spin-orbit interaction of light, optical tweezers, optical torque, microparticle rotation, layered media, angular momentum transport

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