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Related Concept Videos

The Hall Effect01:30

The Hall Effect

Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Published on: November 21, 2019

Optical spin Hall effects in plasmonic chains.

Nir Shitrit1, Itay Bretner, Yuri Gorodetski

  • 1Micro and Nanooptics Laboratory, Faculty of Mechanical Engineering, and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel.

Nano Letters
|April 26, 2011
PubMed
Summary
This summary is machine-generated.

Researchers observed the optical spin Hall effect (OSHE), a spin-dependent momentum redirection, in plasmonic chains. Both isotropic and anisotropic OSHEs were identified, with the anisotropic effect enhancing wavefront phase dislocations.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Plasmonics

Background:

  • The optical spin Hall effect (OSHE) describes spin-dependent momentum redirection in optical systems.
  • Coupled localized plasmonic chains offer a unique platform for investigating light-matter interactions.
  • Understanding spin-dependent phenomena in nanophotonic structures is crucial for advanced optical devices.

Purpose of the Study:

  • To experimentally observe and characterize the optical spin Hall effect (OSHE) in coupled localized plasmonic chains.
  • To differentiate between locally isotropic and anisotropic OSHE phenomena based on plasmonic structure and spin-orbit interaction.
  • To investigate the influence of these effects on wavefront properties, specifically phase dislocations.

Main Methods:

  • Fabrication of coupled localized plasmonic chains with controlled curvature.
  • Optical measurements to detect spin-dependent momentum redirection (OSHE).
  • Analysis of wavefront phase dislocations under different plasmonic anisotropy conditions.

Main Results:

  • Observation of the optical spin Hall effect (OSHE) driven by the curvature of plasmonic chains.
  • Distinction between locally isotropic OSHE (curvature-driven) and locally anisotropic OSHE (spin-anisotropy interaction).
  • Detection of wavefront phase dislocations in circular curvature, with enhanced dislocation strength due to the anisotropic OSHE.

Conclusions:

  • The curvature of plasmonic chains can induce an optical spin Hall effect.
  • Local anisotropy in plasmonic modes significantly influences the OSHE and wavefront properties.
  • These findings provide insights into spin-orbit interactions in nanophotonics and potential applications in optical manipulation.