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Related Concept Videos

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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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.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Coupling, lifetimes, and "strong coupling" maps for single molecules at plasmonic interfaces.

Monosij Mondal1, Maicol A Ochoa1, Maxim Sukharev2

  • 1Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

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|April 23, 2022
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Summary
This summary is machine-generated.

Strong coupling between molecules and plasmons, crucial for modified optical properties, is achievable even at varying distances. This occurs when molecular transition broadening is minimal, enabling Rabi splitting observation.

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Area of Science:

  • * Chemical Physics
  • * Materials Science
  • * Nanophotonics

Background:

  • * Interactions between molecular excited states and metal nanostructure excited states (plasmons) create hybrid states with altered optical properties.
  • * Strong coupling, indicated by avoided crossing, is theorized when 2|⟨U⟩|/ℏΓ > 1, relating molecule-plasmon coupling (⟨U⟩) and transition width (Γ).
  • * The distance-dependent nature of ⟨U⟩ and Γ makes achieving strong coupling conditions uncertain.

Purpose of the Study:

  • * To investigate the behavior of molecule-plasmon coupling (⟨U⟩) and spectral width (Γ) across various molecular-metal nanostructure geometries.
  • * To determine the feasibility of achieving the strong coupling criterion (2|⟨U⟩|/ℏΓ > 1) under different conditions.
  • * To analyze the impact of metal-induced changes in molecular lifetimes on coupling dynamics.

Main Methods:

  • * Theoretical investigation of molecule-plasmon interactions.
  • * Modeling of spectral width (Γ) considering only lifetime broadenings (radiative and nonradiative relaxation).
  • * Analysis of coupling criterion (2|⟨U⟩|/ℏΓ > 1) for varied metal-molecule distances and geometries.

Main Results:

  • * The strong coupling criterion (2|⟨U⟩|/ℏΓ > 1) is surprisingly satisfied for many configurations, independent of metal-molecule distance, when Γ is limited to lifetime broadenings.
  • * This suggests Rabi splitting is observable in such systems if additional broadening sources are minimized.
  • * Spectral shifts caused by molecule-plasmon interaction can complicate Rabi splitting observation when varying distance.

Conclusions:

  • * Strong molecule-plasmon coupling and potential Rabi splitting are more readily achievable than previously assumed, provided broadening is controlled.
  • * Minimizing non-radiative and radiative decay pathways is key to observing strong coupling effects.
  • * Further research should focus on suppressing extraneous broadening mechanisms for practical applications.