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Related Concept Videos

MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

792
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
792

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Related Experiment Video

Updated: Jan 17, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Metasurface-based terahertz TE10-TE01 mode converter.

Boyi Yang, Xiaojie Guo, Yinghao Guo

    Applied Optics
    |September 22, 2025
    PubMed
    Summary

    A novel metasurface mode converter efficiently transforms TE10 to TE01 modes in terahertz waveguides. This compact device offers high conversion efficiency, simplifying terahertz applications.

    Area of Science:

    • Electromagnetics and Optics
    • Metasurface Technology
    • Terahertz Waveguides

    Background:

    • Traditional terahertz mode converters are often bulky and complex.
    • Generating high-quality TE01 modes in circular waveguides is crucial for terahertz applications.
    • Metasurface technology offers a path towards miniaturized and efficient electromagnetic devices.

    Purpose of the Study:

    • To design and simulate a compact broadband mode converter for terahertz frequencies.
    • To achieve high-efficiency conversion from the TE10 mode to the TE01 mode.
    • To demonstrate the potential of metasurface technology in terahertz waveguide applications.

    Main Methods:

    • Designed a two-stage mode converter utilizing a magic-T waveguide and a metasurface.

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  • The first stage converts TE10 to TE20 modes, while the second stage converts TE20 to TE01 modes.
  • Simulated the device performance in the 180-210 GHz band.

    • Main Results:

    • Achieved a maximum conversion efficiency of 88.3% from TE10 to TE01 modes at 184.6 GHz.
    • The device operates over a 22 GHz effective bandwidth.
    • Demonstrated a return loss of 8.4%.

    Conclusions:

    • The designed metasurface-based mode converter provides a compact and efficient solution for generating TE01 modes in terahertz waveguides.
    • This technology can replace complex traditional transitional waveguide structures.
    • The theoretical approach is extendable for generating other terahertz modes.