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Related Concept Videos

¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

2.2K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
2.2K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.7K
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...
1.7K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

861
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.
Spin decoupling is usually achieved by...
861
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.9K
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.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.9K
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

3.8K
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
3.8K
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

8.5K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
8.5K

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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Plasmon coupling in vertical split-ring resonator metamolecules.

Pin Chieh Wu1, Wei-Lun Hsu1, Wei Ting Chen1

  • 1Department of Physics, National Taiwan University, Taipei 10617, Taiwan.

Scientific Reports
|June 6, 2015
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Summary
This summary is machine-generated.

Vertical split-ring resonators (VSRRs) offer enhanced magnetic response at optical frequencies. Their tunable plasmon coupling enables sensitive, frequency-selective devices like sensors and filters.

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Area of Science:

  • Plasmonics
  • Metamaterials
  • Nanophotonics

Background:

  • Traditional planar metamaterials primarily exhibit magnetic response driven by electric fields.
  • Artificial magnetism at optical frequencies is crucial for advanced photonic devices.
  • Existing designs often lack sensitivity to both electric and magnetic fields.

Purpose of the Study:

  • To introduce and characterize vertical split-ring resonators (VSRRs) for enhanced magnetic response.
  • To investigate the plasmon coupling between side-by-side VSRRs.
  • To explore the potential of VSRR-based devices for frequency-selective applications.

Main Methods:

  • Fabrication of vertical split-ring resonators (VSRRs).
  • Experimental study of plasmon coupling by varying the gap between VSRRs.
  • Analysis of magnetic dipole moment excitation by incident electric and magnetic fields.

Main Results:

  • VSRRs demonstrate sensitivity to both electric and magnetic fields.
  • VSRRs exhibit a stronger induced magnetic dipole moment compared to planar split-ring resonators (SRRs).
  • Tunable plasmon coupling achieved by controlling the inter-VSRR gap.

Conclusions:

  • VSRRs represent a promising platform for generating artificial magnetism with enhanced magnetic field sensitivity.
  • The tunable plasmon coupling in VSRR arrays allows for precise control over resonance modes.
  • These findings pave the way for developing highly sensitive frequency-selective devices, including sensors and filters.