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Related Concept Videos

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:
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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:
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...

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Related Experiment Video

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

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Published on: August 5, 2013

Slow light in coupled-resonator-induced transparency.

Kouki Totsuka1, Norihiko Kobayashi, Makoto Tomita

  • 1Department of Physics, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka, 422-8529 Japan.

Physical Review Letters
|August 7, 2007
PubMed
Summary

We demonstrated extremely slow light propagation using coupled ultrahigh-Q silica microspheres. Optical pulses traveled with significant delay and minimal distortion, mimicking electromagnetically induced transparency effects.

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Area of Science:

  • Optics and Photonics
  • Quantum Optics
  • Materials Science

Background:

  • Coupled-resonator-induced transparency (CRIT) offers a pathway to slow light.
  • Ultrahigh-Q silica microspheres provide a robust platform for photonic devices.
  • Controlling light propagation at the nanoscale is crucial for future optical technologies.

Purpose of the Study:

  • To experimentally demonstrate coupled-resonator-induced transparency (CRIT) in a tandem microsphere system.
  • To investigate the propagation characteristics of optical pulses within the CRIT transparency window.
  • To explore the potential of CRIT as a classical analog to electromagnetically induced transparency (EIT) for slow light generation.

Main Methods:

  • Fabrication of two ultrahigh-Q silica microspheres with different diameters.
  • Coupling the microspheres in tandem to a single fiber taper.
  • Performing optical pulse propagation experiments through the coupled-microsphere system.
  • Analyzing pulse delay, attenuation, and shape within the transparency window.

Main Results:

  • Achieved coupled-resonator-induced transparency by coupling two silica microspheres.
  • Observed nearly Gaussian-shaped optical pulses propagating with a substantial positive delay of 8.5 ns.
  • Demonstrated propagation without significant pulse attenuation or deformation within the transparency window.
  • Showcased a classical analog to the slow light effect observed in electromagnetically induced transparency.

Conclusions:

  • Tandem coupled ultrahigh-Q microspheres effectively generate coupled-resonator-induced transparency.
  • This system enables slow light propagation with minimal pulse distortion, offering a classical analog to EIT.
  • The results highlight the potential of microsphere-based systems for advanced optical signal processing and delay applications.