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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

5.6K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

5.1K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
5.1K
IR Spectrum01:19

IR Spectrum

2.6K
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
2.6K
IR Spectrum Peak Intensity: Dipole Moment01:20

IR Spectrum Peak Intensity: Dipole Moment

1.6K
The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...
1.6K
IR Spectrum Peak Intensity: Amount of IR-Active Bonds00:55

IR Spectrum Peak Intensity: Amount of IR-Active Bonds

1.1K
When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with...
1.1K
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

1.6K
In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
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Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle

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Infrared Topological Plasmons in Graphene.

Dafei Jin1, Thomas Christensen2, Marin Soljačić2

  • 1Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA.

Physical Review Letters
|July 1, 2017
PubMed
Summary

We developed a graphene plasmonic platform exhibiting topological edge states for infrared frequencies. These one-way states are robust against defects, paving the way for advanced chiral plasmonic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanophotonics

Background:

  • Topological states of matter offer unique properties like backscattering immunity.
  • Plasmonic systems enable manipulation of light at the nanoscale.
  • Graphene's tunable electronic properties make it a promising material for advanced devices.

Purpose of the Study:

  • To propose and characterize a two-dimensional plasmonic platform based on patterned monolayer graphene.
  • To investigate the hosting of topological one-way edge states in this system.
  • To explore the potential for high-frequency topological plasmonics.

Main Methods:

  • Theoretical classification of band topology under time-reversal symmetry breaking via a static magnetic field.
  • Analysis of plasmonic system band gaps at finite doping.
  • Application of the bulk-edge correspondence principle.

Main Results:

  • A periodically patterned monolayer graphene platform was proposed.
  • Topologically nontrivial band gaps were identified with mid-gap frequencies up to tens of terahertz.
  • Topologically protected one-way edge plasmons, immune to backscattering, were demonstrated.

Conclusions:

  • The proposed graphene platform supports robust, high-frequency topological edge states.
  • This work presents a promising approach for engineering topologically robust chiral plasmonic devices.
  • The findings demonstrate a realistic example of high-frequency topological edge states in a plasmonic system.