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Related Concept Videos

RLC Series Circuits: Impedance01:29

RLC Series Circuits: Impedance

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When current flow is opposed in a DC or AC circuit, it is referred to as resistance or impedance, respectively. Impedance plays a key role in determining the performance of AC circuits. It is represented by Z, which is a combination of resistance and reactance, and depends upon the angular frequency, measured in ohms.
Thus, the magnitude of the impedance is given by the following equation,
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Node Analysis for AC Circuits01:14

Node Analysis for AC Circuits

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Consider an angioplasty system featuring a catheter equipped with a turbine, a critical tool for removing plaque deposits from coronary arteries. This intricate medical device operates using a circuit model reminiscent of a dual-node RLC circuit powered by a current-controlled voltage source.
To unravel the complexities of this system, nodal analysis is employed, a powerful technique founded on Kirchhoff's current law (KCL), which remains valid for phasors. AC circuits can effectively be...
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Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
719
Impedance Combination01:21

Impedance Combination

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Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the voltage...
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Impedances and Admittance01:23

Impedances and Admittance

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In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
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Second-Order Circuits01:17

Second-Order Circuits

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Integrating two fundamental energy storage elements in electrical circuits results in second-order circuits, encompassing RLC circuits and circuits with dual capacitors or inductors (RC and RL circuits). Second-order circuits are identified by second-order differential equations that link input and output signals.
Input signals typically originate from voltage or current sources, with the output often representing voltage across the capacitor and/or current through the inductor. For example, in...
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Related Experiment Video

Updated: Feb 15, 2026

Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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Analysis of 3D plasmonic circuits by using surface impedance models.

Hoda Ameri, Reza Faraji-Dana

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |January 13, 2018
    PubMed
    Summary

    New surface impedance models enable faster analysis of plasmonic circuits. This method reduces computational time and unknowns for improved efficiency in circuit design.

    Area of Science:

    • Plasmonics
    • Electromagnetics
    • Computational methods

    Background:

    • Plasmonic circuits are crucial for advanced optical and electronic devices.
    • Efficient and accurate analysis methods are needed for complex plasmonic circuit design.
    • Current analysis techniques can be computationally intensive.

    Purpose of the Study:

    • To develop novel global and local surface impedance models for plasmonic circuits.
    • To enhance the speed and efficiency of plasmonic circuit analysis.
    • To provide accurate simulation results for plasmonic circuit components.

    Main Methods:

    • Modeling metal strips in plasmonic circuits using surface impedance.
    • Employing the calculated surface impedance in a surface integral equation.

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  • Comparing numerical results with commercial simulation software and volume integral equations.

    • Main Results:

    • The developed surface impedance models provide accurate analysis of plasmonic circuits.
    • The proposed models significantly reduce the number of unknowns compared to volume integral equations.
    • Computational time is substantially decreased, leading to faster and more efficient analysis.

    Conclusions:

    • The novel surface impedance models offer a faster and more efficient approach to analyzing plasmonic circuits.
    • Reducing unknowns to the boundary of the structure is key to computational efficiency.
    • This method facilitates the design and analysis of complex plasmonic devices.