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Related Concept Videos

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:
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:

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Related Experiment Video

Updated: Jun 25, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Fast and slow light in zigzag microring resonator chains.

P Chamorro-Posada1, F J Fraile-Pelaez

  • 1Departamento de Teoría de la Señal y Comunicaciones e Ingenería Telemática, Universidad de Valladolid, ETSI Telecomunicación, Campus Miguel Delibes, Valladolid, Spain. pedcha@tel.uva.es

Optics Letters
|March 3, 2009
PubMed
Summary
This summary is machine-generated.

Researchers studied light transmission in zigzag microring resonators. They discovered a new superluminal effect where optical pulses are reproduced almost instantly, and found tunable slow-light transmission is possible.

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Area of Science:

  • Photonics and optical engineering
  • Condensed matter physics
  • Quantum optics

Background:

  • Microring resonators are fundamental components in integrated photonics.
  • Controlling light propagation speed is crucial for optical signal processing and communication.
  • Previous research explored slow-light phenomena, but achieving tunable control and novel superluminal effects remains challenging.

Purpose of the Study:

  • To analyze fast- and slow-light transmission characteristics in a zigzag microring resonator chain.
  • To investigate a novel superluminal light-transmission effect.
  • To explore the tunability of optical pulse delay and propose a stable configuration for active devices.

Main Methods:

  • Theoretical analysis of light transmission in a coupled microring resonator system.
  • Numerical simulations to observe pulse propagation dynamics.
  • Investigation of superluminal (faster-than-light) and subluminal (slower-than-light) transmission regimes.
  • Proposal and numerical analysis of a laser-array configuration for active device operation.

Main Results:

  • A novel superluminal light-transmission effect was observed, where input optical pulses are reproduced nearly simultaneously at system outputs.
  • The system allows for tunable slow-light propagation by adjusting the input carrier frequency.
  • A broad range of relative delay tunability was demonstrated between superluminal and slow-light regimes.
  • A laser-array configuration was proposed and numerically analyzed for stable active device operation.

Conclusions:

  • Zigzag microring resonator chains offer unique capabilities for controlling light propagation speed.
  • The demonstrated superluminal effect presents new possibilities for ultrafast optical signal reproduction.
  • Tunable slow-light transmission is achievable, enabling applications in optical buffering and delay lines.
  • The proposed laser-array configuration provides a pathway for realizing stable active photonic devices based on this system.