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Related Concept Videos

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
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.
Starting with a fixed...
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:
RLC Circuit as a Damped Oscillator01:30

RLC Circuit as a Damped Oscillator

An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...

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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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Switching and amplification in disordered lasing resonators.

Marco Leonetti1, Claudio Conti, Cefe Lopez

  • 1ISC-CNR, UOS Sapienza, P A Moro 2, 00185 Roma, Italy. marco.leonetti@roma1.infn.it

Nature Communications
|April 25, 2013
PubMed
Summary
This summary is machine-generated.

This study reveals how energy can be spatially and spectrally transferred in disordered active media using coupled lasing modes. This enables remote transmission of optical resonance, creating a random lasing system that functions as a switch and amplifier.

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Area of Science:

  • * Physics and Optics
  • * Condensed Matter Physics
  • * Photonics

Background:

  • * Controlling energy flow in disordered media is crucial for various applications.
  • * Wavefront shaping can partially compensate for disorder effects in optical beam transmission but sacrifices control over individual light paths.
  • * Understanding light propagation in random media remains a significant research challenge.

Purpose of the Study:

  • * To demonstrate a novel physical effect for controlling energy transfer in disordered active media.
  • * To investigate the spatial and spectral transfer of energy via coupled lasing modes.
  • * To explore the potential of random lasing systems as switches and amplifiers.

Main Methods:

  • * Utilized a disordered active medium.
  • * Employed controlled optical excitations to couple individual lasing modes.
  • * Analyzed the spatial and spectral characteristics of energy transfer.

Main Results:

  • * Demonstrated spatial and spectral energy transfer within the disordered active medium.
  • * Showed that optical resonance can be transmitted to a remote point.
  • * Developed a random lasing system exhibiting switching and amplification properties.

Conclusions:

  • * Coupling between lasing modes in disordered active media enables novel energy transfer mechanisms.
  • * The demonstrated effect allows for remote control of optical resonance.
  • * Random lasing systems can be engineered to function as efficient optical switches and amplifiers.