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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.
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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
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On-chip ultracompact multimode vortex beam emitter based on vertical modes.

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    This study introduces a compact on-chip emitter for orbital angular momentum (OAM) communication, enabling more OAM modes without increasing device size. This breakthrough enhances optical interconnects by utilizing vertical modes in waveguides.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Integrated Optics

    Background:

    • Free-space orbital angular momentum (OAM) communication is a promising on-chip optical interconnect solution.
    • Current vortex beam emitters face limitations in scaling OAM modes with device size.
    • Increasing OAM modes is crucial for advancing high-speed communication capacity.

    Purpose of the Study:

    • To propose an ultracompact on-chip multimode vortex beam emitter.
    • To enable the emission of more OAM modes without increasing emitter size.
    • To present a novel strategy for optical waveguide mode selection in photonic integrated circuits.

    Main Methods:

    • Utilizing vertical modes in large-aspect-ratio waveguides to enable multimode microrings with small radii.
    • Designing four-mode and five-mode vortex beam emitters with a 1.5 µm radius.
    • Employing simulations to verify emitter effectiveness.
    • Presenting a method for high-order vertical mode coupling by adjusting waveguide height.

    Main Results:

    • Demonstrated an on-chip emitter capable of supporting multiple OAM modes within a small footprint.
    • Achieved effective emission of four and five OAM modes using microrings of 1.5 µm radius.
    • Verified the effectiveness of the proposed emitter design through simulations.
    • Presented a high-efficiency, low-crosstalk coupling technique for vertical modes.

    Conclusions:

    • The proposed vertical mode-based emitter overcomes the size constraints of traditional OAM emitters.
    • This research facilitates greater integration of on-chip optical interconnections.
    • A new strategy for selecting optical waveguide modes in photonic integrated circuits is provided.