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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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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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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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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Single-pixel reconstructive mid-infrared micro-spectrometer.

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    Researchers developed a novel single-pixel mid-infrared (MIR) micro-spectrometer. This compact device uses a tunable light source, overcoming limitations of traditional spectrometers for portable electronics.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Miniaturized mid-infrared (MIR) spectrometers are essential for portable sensing but face size limitations due to conventional components.
    • Existing micro-spectrometers often rely on bulky gratings or detector arrays, hindering further miniaturization.

    Purpose of the Study:

    • To demonstrate a novel single-pixel MIR micro-spectrometer design that overcomes miniaturization limitations.
    • To enable compact MIR spectrometers for integration into portable electronic systems.

    Main Methods:

    • Developed a spectrally tunable MIR light source utilizing the metal-insulator phase transition of vanadium dioxide (VO2).
    • Reconstructed sample transmission spectra using a spectrally dispersed light source, avoiding spatially grated beams.
    • Validated performance by computationally reconstructing the transmission spectrum of a magnesium fluoride (MgF2) sample.

    Main Results:

    • Successfully demonstrated a single-pixel MIR micro-spectrometer.
    • Achieved spectral reconstruction by engineering thermal emissivity via VO2 phase transition.
    • Validated the device's capability to computationally reconstruct sample spectra.

    Conclusions:

    • The array-free design offers a potentially minimal footprint for MIR spectrometers.
    • This technology paves the way for integrating compact MIR spectrometers into portable electronics for diverse applications.
    • Advances in miniaturized sensing and analysis capabilities for next-generation portable devices.