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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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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.
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Related Experiment Video

Updated: Mar 21, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Two-dimensional photonic-crystal-based double switch-divider.

Victor Dmitriev, Leno Martins

    Applied Optics
    |May 4, 2016
    PubMed
    Summary

    We developed a novel photonic crystal T-junction component for terahertz (THz) applications. This device acts as a switch, power divider, and router, controlled by a magnetic field.

    Area of Science:

    • Photonics
    • Terahertz (THz) Technology
    • Materials Science

    Background:

    • Photonic crystals offer unique light manipulation capabilities.
    • Developing multifunctional components is crucial for integrated photonic circuits.
    • Terahertz frequencies present opportunities for novel sensing and communication.

    Purpose of the Study:

    • To propose and investigate a new multifunctional component based on a T-junction in a 2D photonic crystal.
    • To demonstrate its ability to function as a switch (ON/OFF), a 3 dB power divider, and a selective port router.
    • To analyze its performance characteristics in the low terahertz region.

    Main Methods:

    • Design of a T-junction structure within a 2D square lattice photonic crystal.
    • Incorporation of a DC magnetic field-controlled ferrite resonator at the T-junction.

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  • Analysis of scattering matrices and calculation of frequency characteristics.

    • Main Results:

    • Achieved port isolation better than -30 dB in the OFF state.
    • Demonstrated 3 dB power division with approximately -3.8±1.0 dB insertion loss.
    • Exhibited selective port switching with isolation > -15 dB and insertion loss < -2.0 dB.

    Conclusions:

    • The proposed photonic crystal T-junction is a versatile component for THz applications.
    • Magnetic field control enables dynamic switching between different operational modes.
    • The device shows promising performance for integrated THz systems.