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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Phase-sensitive terahertz upconversion detection.

Tobias Pfeiffer, Jens Klier, Georg von Freymann

    Optics Express
    |October 14, 2022
    PubMed
    Summary

    We developed a new phase-sensitive method for detecting terahertz pulses by observing visible light. This technique allows for rapid and precise measurements of layer thicknesses using standard equipment.

    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Materials Science

    Background:

    • Nonlinear frequency conversion is key for detecting low-energy photons outside the pump wavelength.
    • Photon phase, in addition to intensity, offers crucial information for advanced applications.
    • Terahertz (THz) spectroscopy is valuable but often requires specialized detection methods.

    Purpose of the Study:

    • To present a novel phase-sensitive measurement technique for the terahertz spectral range.
    • To enable THz detection using only visible light detection equipment.
    • To demonstrate fast and precise layer-thickness determination using this new method.

    Main Methods:

    • Utilizing nonlinear frequency conversion to upconvert terahertz photons to the visible spectrum.

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  • Employing optical interference between frequency-converted photons and residual pump photons.
  • Implementing standard sCMOS cameras for detecting the visible light signals.

    • Main Results:

    • Successful phase-resolved detection of terahertz pulses was achieved.
    • Layer-thickness measurements were performed with high speed, under one second.
    • The method demonstrated high precision, with an error of less than 0.6%.

    Conclusions:

    • The presented method offers a powerful, accessible approach for phase-sensitive terahertz measurements.
    • This technique simplifies THz detection by leveraging visible light detection.
    • It opens new possibilities for rapid, high-precision characterization in various scientific and industrial fields.