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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

876
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
876

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Ultracompact terahertz plasmonic mode division multiplexer.

Xinyu Ma, Yanfeng Li, Jiaguang Han

    Optics Letters
    |March 1, 2023
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    Summary
    This summary is machine-generated.

    This study introduces an ultracompact terahertz (THz) mode division multiplexer using spoof surface plasmon polaritons (SPPs). This novel device supports four THz modes, paving the way for advanced on-chip communication systems.

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    Area of Science:

    • Photonics and Plasmonics
    • Terahertz Technology
    • Nanoscale Devices

    Background:

    • Traditional optical multiplexing devices often require large footprints.
    • Terahertz (THz) technology offers potential for high-speed data transmission.
    • Spoof surface plasmon polaritons (SPPs) enable subwavelength wave confinement at THz frequencies.

    Purpose of the Study:

    • To propose and demonstrate an ultracompact THz mode division multiplexer.
    • To exploit THz spoof SPPs for enhanced device miniaturization.
    • To enable multimode propagation for future THz communication systems.

    Main Methods:

    • Design of a mode multiplexer utilizing a rectangular metallic pillar unit cell.
    • Numerical evaluation of a cascaded plasmonic mode division circuit (multiplexer and demultiplexer).
    • Analysis of device performance including crosstalk and excess loss.

    Main Results:

    • The proposed device supports four simultaneous mode channels (TM0, TM1, TM2, TM3).
    • The cascaded circuit exhibits crosstalk below -15 dB and excess loss below 3.7 dB at 0.65 THz.
    • The device achieves an ultracompact footprint of approximately 27 × 2.3 mm.

    Conclusions:

    • This work presents the first reported mode division multiplexer based on THz spoof SPPs.
    • The developed device offers significant miniaturization compared to traditional multiplexers.
    • This technology is crucial for the development of future THz on-chip multimode communication systems.