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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

1.6K
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 Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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IR Spectrum01:19

IR Spectrum

1.0K
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%...
1.0K
IR Spectrometers01:25

IR Spectrometers

1.1K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.1K
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

969
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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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

2.1K
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...
2.1K

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Surface plasmons-phonons for mid-infrared hyperspectral imaging.

Hong Zhou1,2, Dongxiao Li1,2, Zhihao Ren1,2

  • 1Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore.

Science Advances
|May 29, 2024
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This summary is machine-generated.

Surface phonons enhance hyperspectral imaging sensitivity and molecule identification, outperforming plasmonic systems. This phonon polaritonics advancement promises breakthroughs in screening and pharmaceutical analysis.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Spectroscopy

Background:

  • Surface plasmons boost mid-infrared hyperspectral imaging sensitivity by enhancing light-matter interactions.
  • The role of surface phonons in hyperspectral imaging remains unclear.
  • Nanoantennas offer a platform for exploring coupled plasmon-phonon phenomena.

Purpose of the Study:

  • To investigate the contribution of surface phonons to hyperspectral imaging.
  • To develop a novel plasmon-phonon hyperspectral imaging system.
  • To demonstrate enhanced molecule identification capabilities using phonon modes.

Main Methods:

  • Development of asymmetric cross-shaped nanoantennas from stacked plasmon-phonon materials.
  • Utilizing light polarization to control phonon modes and capture molecular features.
  • Employing deep learning for hyperspectral image analysis and identification.
  • Demonstrating imaging of severe acute respiratory syndrome coronavirus (SARS-CoV) spike proteins.

Main Results:

  • Phonon modes capture distinct molecular refractive index intensity and lineshape features.
  • Enhanced identification capabilities with phonons (230,400 spectra/s) for SARS-CoV.
  • Facilitated de-overlapping and spatial distribution observation of mixed SARS-CoV spike proteins.
  • Achieved 93% identification accuracy, heightened sensitivity, and detection limits down to molecule monolayers.

Conclusions:

  • Surface phonons significantly contribute to hyperspectral imaging, offering precise molecule identification.
  • The developed plasmon-phonon system surpasses plasmonic counterparts in sensitivity and accuracy.
  • Phonon polaritonics integrated into hyperspectral imaging opens new avenues for molecular screening and pharmaceutical analysis.