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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

378
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:
378

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Coherent suppression of backscattering in optical microresonators.

Andreas Ø Svela1,2,3, Jonathan M Silver4,5, Leonardo Del Bino4,6,7

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Researchers suppressed microresonator backscattering by over 30 dB using an external scatterer. This technique uses destructive interference to minimize light reflections, improving microresonator performance in applications like ring-laser gyroscopes.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Light propagation in waveguides can lead to backscattering from Rayleigh scatterers.
  • In high-quality-factor whispering-gallery-mode microresonators, backscattering originates from surface or bulk imperfections.
  • Minimizing backscattering is crucial for many microresonator applications.

Purpose of the Study:

  • To demonstrate a method for coherently suppressing backscattering in microresonators.
  • To investigate the use of an external scatterer to control backscattering.
  • To improve the performance of microresonator-based devices limited by back reflections.

Main Methods:

  • Introducing an additional scatterer into the near field of a microresonator.
  • Precisely controlling the position of the external scatterer.
  • Utilizing destructive interference between intrinsic and induced backpropagating fields.

Main Results:

  • Achieved over 30 dB suppression of backscattering in high-quality-factor microresonators.
  • Demonstrated coherent control over light backpropagation.
  • Validated the effectiveness of the destructive interference technique.

Conclusions:

  • External scatterer-induced destructive interference offers a powerful method to suppress microresonator backscattering.
  • This technique can enhance the performance of devices like ring-laser gyroscopes and dual frequency combs.
  • The findings are relevant for integrated photonic circuits, improving laser stability and component performance.