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Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
Series Resonance01:17

Series Resonance

The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
Series RLC Circuit without Source01:21

Series RLC Circuit without Source

Within the field of electrical circuits, source-free RLC circuits present an intriguing domain. These circuits comprise a series arrangement of a resistor, inductor, and capacitor, operating independently of external energy sources. Their initiation hinges upon utilizing the initial energy stored within the capacitor and inductor to instigate their functionality. Their mathematical equation, a second-order differential equation, sets these circuits apart. This equation captures how the...
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
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Related Experiment Video

Updated: Jun 27, 2026

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
10:28

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

Published on: March 23, 2017

Optical plasmonic resonances in split-ring resonator structures: an improved LC model.

T D Corrigan1, P W Kolb, A B Sushkov

  • 1Department of Physics, University of Maryland, College Park, MD 20742, USA. tdcorrigan@lps.umd.edu

Optics Express
|November 26, 2008
PubMed
Summary
This summary is machine-generated.

We studied how the plasmonic resonance of silver nano-structures changes with shape. Complex structures like split rings exhibit distinct resonant modes, explained by an improved LC model.

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Area of Science:

  • Plasmonics and Nanophotonics
  • Computational Electromagnetics

Background:

  • Noble metal nanostructures exhibit unique optical properties due to surface plasmon resonances.
  • The electromagnetic response of nanostructures is highly dependent on their geometry and arrangement.

Purpose of the Study:

  • To systematically investigate the plasmonic resonant behavior of silver nanostructures with increasing geometric complexity.
  • To understand the origin and evolution of different plasmonic modes in rods, U-shapes, and split ring resonators.
  • To develop an improved model for describing the lowest order plasmonic resonance.

Main Methods:

  • Fabrication and optical characterization of silver nanostructures (rods, U-shapes, split rings).
  • Numerical simulations (electromagnetic field and current density analysis).
  • Theoretical modeling using an enhanced LC circuit model.

Main Results:

  • Plasmonic resonance red shifts as nanostructure complexity increases from rods to U-shapes to split rings.
  • A second resonance mode appears and intensifies with U-shape arm extension, and a third mode emerges in split rings.
  • Electromagnetic field and current density simulations reveal distinct current paths for different resonance modes.
  • Detailed analysis of the lowest order mode, considering skin depth effects, supports an improved LC model.

Conclusions:

  • The geometric evolution of silver nanostructures leads to predictable shifts and the emergence of distinct plasmonic resonance modes.
  • Electromagnetic simulations provide crucial insights into the current distribution responsible for these modes.
  • An enhanced LC model effectively describes the lowest order plasmonic resonance in these nanostructures.