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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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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...
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    Area of Science:

    • Photonics
    • Integrated Optics
    • Nanophotonics

    Background:

    • Mode converters are crucial for optical signal processing.
    • Existing designs often face challenges with size, efficiency, or fabrication complexity.

    Purpose of the Study:

    • To design and experimentally demonstrate novel compact mode converters.
    • To achieve efficient conversion between transverse electric (TE) modes on a silicon-on-insulator (SOI) platform.

    Main Methods:

    • Utilized lightning-like and arrow-like polygonal subwavelength grating (SWG) structures.
    • Fabricated devices on a silicon-on-insulator (SOI) platform using a one-step full-etching process.

    Main Results:

    • Demonstrated TE0 to TE1 and TE0 to TE2 mode conversion.
    • Achieved ultra-compact footprints (4.44 × 1.3 µm² and 5.89 × 1.8 µm²).
    • Obtained low insertion loss (<1 dB), broad bandwidth (>50 nm), and low crosstalk (-7.2 dB and -10.3 dB).

    Conclusions:

    • The proposed SWG mode converters offer a promising solution for integrated photonic circuits.
    • The designs provide excellent performance metrics and simplified fabrication.
    • These compact devices are suitable for advanced optical communication and signal processing applications.