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Related Concept Videos

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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IR Frequency Region: Fingerprint Region01:03

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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 Spectrometers

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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...
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IR Frequency Region: X–H Stretching01:24

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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 Spectrum01:19

IR Spectrum

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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.
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Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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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.
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Array truncation effects in infrared frequency selective surfaces.

Jeffrey D' Archangel, Eric Tucker, Markus B Raschke

    Optics Express
    |July 1, 2014
    PubMed
    Summary

    Truncating metasurface arrays of square loops shifts absorption spectra to shorter wavelengths. Finite array size reduces electric field uniformity, impacting performance at 10.6 µm.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Electromagnetism

    Background:

    • Metasurfaces offer tailored electromagnetic responses.
    • Maximal absorptivity designs are crucial for applications.
    • Array truncation effects in metasurfaces require investigation.

    Purpose of the Study:

    • To investigate the impact of array truncation on metasurface absorptivity.
    • To analyze the effects on spectral characteristics and electric field distribution.
    • To compare experimental results with simulations.

    Main Methods:

    • Fabrication of finite arrays from an infinite metasurface design.
    • Far-field Fourier Transform Infrared (FTIR) spectroscopy.
    • Scattering Scanning Near-field Optical Microscopy (s-SNOM).

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  • Electromagnetic simulations.

    • Main Results:

    • Observed blue-shift in far-field absorption spectra with decreasing array size.
    • Demonstrated reduced uniformity in local electric field amplitude and phase with truncation.
    • Simulations accurately predicted experimental spectral and near-field behaviors.

    Conclusions:

    • Array truncation significantly alters metasurface spectral properties.
    • Finite array size leads to non-uniform local electric fields.
    • Understanding truncation effects is vital for designing practical metasurface devices.