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Parallel Resonance

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:

Series Resonance

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...

Characteristics of Series Resonant Circuit

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:

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Updated: May 20, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Electrically connected resonant optical antennas.

Jord C Prangsma¹, Johannes Kern, Alexander G Knapp

¹Nano-Optics & Biophotonics Group, Experimentelle Physik 5, Physikalisches Institut, Wilhelm-Conrad-Röntgen-Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.

|July 18, 2012

Summary

This summary is machine-generated.

Electrically connected optical antennas achieve high electric fields for nanoscale devices. These resonant antennas maintain optical properties and withstand high direct current (DC) fields without damage.

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Area of Science:

Plasmonics
Nanophotonics
Electromagnetism

Background:

Resonant optical antennas are key components in nanoscale electro-plasmonic devices.
These devices utilize electric fields and near-field intensity enhancement for high efficiency.

Purpose of the Study:

To demonstrate the feasibility of electrically connecting resonant optical antennas.
To investigate the impact of electrical connections on antenna resonance and optical properties.
To assess the achievable direct current (DC) electric fields in the antenna gaps.

Main Methods:

Attaching electrical leads to a two-wire antenna at positions of minimal near-field intensity.
Conducting white-light scattering experiments.
Performing electromagnetic simulations.
Analyzing the electric properties of the connected antennas.

Main Results:

Electrical connections were made with negligible influence on antenna resonance.
Optical tunability of the connected antennas was fully retained, confirmed by scattering experiments and simulations.
Direct current (DC) electric fields of 10^8 V/m were consistently achieved and maintained in the antenna gaps.
No noticeable damage to the antennas was observed during extended operation.

Conclusions:

Electrically connected resonant optical antennas are feasible for advanced nanoscale devices.
The integration of electrical leads does not compromise the optical performance of these antennas.
The demonstrated ability to achieve and sustain high DC electric fields opens possibilities for novel electro-plasmonic applications.