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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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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.
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...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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.
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...
980
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

260
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...
260
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

444
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
444
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Interface phonon polariton coupling to enhance graphene absorption.

Zhenyao Chen1, Junjie Mei1, Ye Zhang1

  • 1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.

Frontiers of Optoelectronics
|January 13, 2023
PubMed
Summary

We developed a graphene photodetector with enhanced infrared absorption using interface phonon polaritons (IPhPs). This novel structure shows significant potential for advanced graphene infrared detection technologies.

Keywords:
graphene photodetectorinfrared absorption enhancementinterface phonon polariton (IPhP)

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Graphene's unique electronic properties make it promising for photodetectors.
  • Enhancing light absorption in graphene, especially in the infrared spectrum, is crucial for device performance.
  • Interface phonon polaritons (IPhPs) offer a pathway to boost light-matter interactions.

Purpose of the Study:

  • To present a graphene photodetector design leveraging IPhP coupling for enhanced infrared absorption.
  • To investigate the role of the SiC/AlN interface in supporting IPhPs.
  • To explore the tunability of absorption frequency through device structure parameters.

Main Methods:

  • Utilizing interface phonon polaritons (IPhPs) at the SiC/AlN interface.
  • Employing gated-field tuning to excite interband transitions in intrinsic graphene.
  • Performing simulations to analyze graphene and system absorbance at normal incidence in the mid-infrared range.

Main Results:

  • Achieved enhanced infrared absorption in graphene and the overall structure via IPhP coupling.
  • Simulations demonstrated graphene absorbance up to 43% and system absorbance close to unity in the mid-infrared range.
  • Identified AlN layer thickness as the primary determinant of peak absorption frequency, with a red-shift observed as thickness decreases.

Conclusions:

  • The proposed graphene photodetector design effectively enhances infrared absorption through IPhP coupling.
  • The tunability of absorption frequency by AlN thickness offers design flexibility for specific infrared detection applications.
  • This structure holds significant potential for advancing graphene-based infrared detection technology.