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Related Concept Videos

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Polarization-variable emitter for terahertz time-domain spectroscopy.

Dmitry S Bulgarevich, Makoto Watanabe, Mitsuharu Shiwa

    Optics Express
    |December 2, 2016
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new multi-electrode emitter for terahertz time-domain spectroscopy. This device allows for controlled rotation of the terahertz field

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    Area of Science:

    • Physics
    • Electrical Engineering
    • Materials Science

    Background:

    • Terahertz time-domain spectroscopy (THz-TDS) requires precise control over the emitted terahertz (THz) field polarization.
    • Existing methods for generating polarization-variable THz radiation can be complex or limited in their tunability.

    Purpose of the Study:

    • To report on the development of a novel linear polarization-variable multi-electrode emitter for THz-TDS.
    • To demonstrate the microfabrication, modeling, simulation, and experimental validation of this new emitter.

    Main Methods:

    • Microfabrication of a multi-electrode emitter structure.
    • Finite Element Method (FEM) modeling for optimizing bias distribution across electrodes.
    • Finite-Difference Time-Domain (FDTD) simulations to predict spectral output.
    • Experimental testing to verify the performance of the fabricated emitter.

    Main Results:

    • Successful microfabrication of the multi-electrode emitter.
    • FEM modeling provided insights into optimal bias configurations for polarization control.
    • FDTD simulations predicted the spectral characteristics of the emitted THz radiation.
    • Experimental results confirmed the ability to achieve 45° increments in linear polarization rotation.

    Conclusions:

    • The developed multi-electrode emitter offers a viable method for generating polarization-tunable THz radiation.
    • Synchronized bias adjustments and polarizer rotation enable controlled rotation of the linear polarization of the emitted THz field.
    • This technology advances THz-TDS capabilities for applications requiring polarization control.