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Related Concept Videos

IR Spectrometers01:25

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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Infrared (IR) Spectroscopy: Overview01:09

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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.
Different compounds display unique properties due to their...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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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 Spectrum01:19

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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.
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%...
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Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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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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Single-layer IR reflectors with wideband spectra.

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    Researchers developed single-layer long-wave infrared (LWIR) reflectors that match multilayer Bragg stack performance. These novel LWIR reflectors simplify design and manufacturing for thermal imaging and other applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Traditional multilayer Bragg stacks are used for infrared reflection.
    • Advancements in nanofabrication enable new optical structures.

    Purpose of the Study:

    • To develop and characterize single-layer reflectors for the long-wave infrared (LWIR) spectrum.
    • To demonstrate performance comparable to multilayer Bragg stacks.
    • To explore simplified design and manufacturing of IR reflectors.

    Main Methods:

    • Theoretical modeling of photonic stopband behavior.
    • Experimental validation of single-layer reflector performance.
    • Materials selection based on optical properties.

    Main Results:

    • Single-layer LWIR reflectors achieve performance comparable to multilayer Bragg stacks.
    • Demonstrated mimicry of photonic stopband behavior.
    • Identified material and fabrication parameters for effective engineering.

    Conclusions:

    • Single-layer LWIR reflectors offer a simplified alternative to traditional multilayer designs.
    • Potential applications include thermal imaging, environmental monitoring, and stealth technology.
    • Further advancements in fabrication precision are needed for practical deployment.