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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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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Double Resonance Techniques: Overview01:12

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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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Biasing of Metal-Semiconductor Junctions01:27

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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Related Experiment Video

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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

Critical coupling in plasmonic resonator arrays.

Sinan Balci1, Coskun Kocabas, Atilla Aydinli

  • 1Department of Physics, Advanced Research Laboratories and Turk Telekom Laboratory, Bilkent University, 06800 Ankara, Turkey. balci@fen.bilkent.edu.tr

Optics Letters
|August 3, 2011
PubMed
Summary

We achieved critical coupling of light to plasmonic cavities on Moiré surfaces. Coupling depends on the Moiré superperiod, enabling efficient power transfer in traveling wave resonators.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Surface Science

Background:

  • Moiré surfaces offer unique periodic potentials for nanostructure fabrication.
  • Plasmonic cavities enable light manipulation at the nanoscale.

Purpose of the Study:

  • To investigate critical coupling of electromagnetic waves to plasmonic cavity arrays on Moiré surfaces.
  • To understand how Moiré superperiodicity influences plasmonic coupling and energy transfer.

Main Methods:

  • Fabrication of plasmonic cavity arrays on Moiré surfaces.
  • Dark field plasmon microscopy imaging.
  • Polarization-dependent spectroscopic reflection measurements.
  • Analytical and finite difference time domain (FDTD) calculations.

Main Results:

  • Critical coupling conditions were revealed and experimentally verified.
  • Critical coupling and inter-cavity coupling are dependent on the Moiré superperiod.
  • Complete incident power transfer was achieved for traveling wave resonators with short superperiods.
  • Resonators with longer superperiods exhibited isolated standing wave behavior, limiting power transfer.

Conclusions:

  • The Moiré superperiod is a critical parameter controlling plasmonic coupling in cavity arrays.
  • Tailoring the Moiré superperiod allows for control over energy transfer dynamics in plasmonic systems.