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Videos de Conceptos Relacionados

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
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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...
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:
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...

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Laser de microcavidad que oscila en un resonador basado en circuitos.

Christoph Walther1, Giacomo Scalari, Maria Ines Amanti

  • 1Institute for Quantum Electronics, ETH Zurich, Wolfgang-Pauli-Strasse 16, 8093 Zurich, Switzerland. walther@phys.ethz.ch

Science (New York, N.Y.)
|March 20, 2010
PubMed
Resumen

Los investigadores desarrollaron un láser de terahertz ultrapequeño utilizando un circuito de resonancia de inductor-capacitor electrónico (LC) de longitud de onda inferior. Este dispositivo compacto y de baja potencia limita los campos eléctricos y ofrece el potencial para velocidades de modulación ultrarrápidas.

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Área de la Ciencia:

  • La fotónica es la fotónica.
  • Ingeniería Eléctrica Ingeniería Eléctrica.
  • Física Aplicada es la física aplicada.

Sus antecedentes:

  • Los láseres de microcavidad ofrecen ventajas como compacidad y bajo consumo de energía.
  • Las velocidades de modulación ultra rápidas son cruciales para los sistemas de comunicación avanzados.
  • Las frecuencias de terahercios (THz) presentan oportunidades únicas para la espectroscopia e imágenes.

Objetivo del estudio:

  • Para demostrar un láser ultrapequeño, inyectado eléctricamente que opera en el rango de los terahertz.
  • Para utilizar un circuito resonante de inductor-capacitor electrónico (LC) de longitud de onda inferior para el confinamiento de campos eléctricos extremos.
  • Explorar el potencial de este diseño para frecuencias más altas y otros dispositivos optoelectrónicos.

Principales métodos:

  • Fabricación de un dispositivo láser ultrasmall que incorpora un circuito de resonancia electrónico LC de longitud de onda inferior.
  • Inyección eléctrica para el funcionamiento del láser.
  • Caracterización de la frecuencia de funcionamiento del láser y el volumen del modo.

Principales resultados:

  • Demostración exitosa de un láser inyectado eléctricamente que funciona a 1,5 terahertz.
  • Se logró el confinamiento extremo del campo eléctrico debido al resonador LC de longitud de onda inferior.
  • El volumen del modo del láser era fuertemente de longitud de onda inferior, lo que permitía la miniaturización.

Conclusiones:

  • El láser resonador LC ultrasmall desarrollado es un avance significativo en la optoelectrónica de terahertz.
  • El principio de diseño es escalable a frecuencias más altas y adaptable para detectores y moduladores.
  • Esta tecnología es prometedora para aplicaciones de THz compactas y de alta velocidad.