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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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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Related Experiment Video

Updated: Dec 16, 2025

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
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Compact terahertz spectrometer based on sequential modulation of disordered rough surfaces.

Tao Yang, Yue Zhang, Jia-Cheng Ge

    Optics Letters
    |July 7, 2020
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    Summary
    This summary is machine-generated.

    This study introduces a compact terahertz (THz) spectrometer that reconstructs frequency spectra using light interference on random surfaces. This novel device offers high-resolution THz spectroscopy for portable applications.

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    Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Terahertz Technology

    Background:

    • Terahertz (THz) spectroscopy is crucial for material analysis but often requires bulky equipment.
    • Existing THz spectrometers face limitations in portability and resolution.
    • Dispersive interference in disordered surfaces presents an underexplored phenomenon for spectroscopic applications.

    Purpose of the Study:

    • To develop a compact and portable terahertz (THz) spectrometer.
    • To utilize dispersive interference effects in disordered random surfaces for spectral reconstruction.
    • To achieve broadband and high-resolution THz spectral analysis.

    Main Methods:

    • A novel THz spectrometer design employing a roughened transmission plate.
    • Frequency-dependent parameter sweeping via lateral displacement or electro-optic modulation.
    • Sequential capture of 2D transmission intensities using a single detector.
    • Spectral reconstruction by solving linear equations with a calibration dataset.
    • Application of smoothing Tikhonov regularization for enhanced accuracy.

    Main Results:

    • Demonstration of a compact THz spectrometer based on interference in disordered surfaces.
    • Successful reconstruction of THz beam frequency spectra.
    • Achieved broadband operation with high spectral resolution.
    • Validation of the device's suitability for portable spectroscopy.

    Conclusions:

    • The developed THz spectrometer offers a compact and efficient alternative for spectral analysis.
    • The use of dispersive interference in random surfaces is a viable method for THz spectral reconstruction.
    • The device is well-suited for field-deployable and portable THz spectroscopy applications.