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Unidirectional spintronic terahertz emitters with high efficiency.

Xiaoqiang Zhang, Yunqing Jiang, Yong Xu

    Optics Letters
    |December 20, 2022
    PubMed
    Summary

    Researchers developed a unidirectional spintronic terahertz emitter (USTE) by combining a spintronic terahertz emitter with a metal grating. This USTE enhances terahertz wave intensity and allows for frequency tuning, enabling new applications.

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    Area of Science:

    • Physics
    • Engineering
    • Materials Science

    Background:

    • Spintronic terahertz emitters (STEs) are high-performance, low-cost terahertz sources.
    • Current research primarily focuses on THz generation, neglecting control and modulation.

    Purpose of the Study:

    • To propose and investigate a unidirectional spintronic terahertz emitter (USTE) for enhanced THz wave control.
    • To demonstrate the manipulation of THz emission characteristics using a metal grating integration.

    Main Methods:

    • Dyadic Green's function method for theoretical analysis.
    • Finite element method for numerical simulations.
    • Integration of a common STE with a metal grating structure.

    Main Results:

    • The metal grating exhibits high optical transmission (>97%) and THz reflectivity (>99%).
    • The USTE achieves unidirectional THz emission with over 4-fold intensity enhancement.
    • Tunable central frequency and THz wave steering are demonstrated by adjusting grating parameters.

    Conclusions:

    • The USTE offers enhanced control over THz emission properties.
    • This technology has potential applications in THz wireless communications, holographic imaging, and bio-sensing.