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Related Experiment Videos

Tunable delay line with interacting whispering-gallery-mode resonators.

L Maleki1, A B Matsko, A A Savchenkov

  • 1Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA.

Optics Letters
|March 24, 2004
PubMed
Summary

Researchers theoretically studied two interacting optical resonators, creating a tunable delay line with a remarkably narrow spectral feature. This narrowband modal structure, analogous to quantum electromagnetically induced transparency, offers enhanced optical control.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Quantum Optics

Background:

  • Whispering-gallery-mode (WGM) resonators are crucial for various photonic applications.
  • Controlling spectral features of optical resonators is essential for advanced devices like delay lines.

Purpose of the Study:

  • To theoretically investigate a parallel configuration of two interacting WGM optical resonators.
  • To demonstrate a narrowband modal structure suitable for a widely tunable delay line.

Main Methods:

  • Theoretical study of coupled optical resonator systems.
  • Analysis of modal structures and spectral bandwidths under specific coupling configurations.

Main Results:

  • A parallel configuration of two interacting WGM resonators exhibits a narrowband modal structure.

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  • The system can achieve spectral features significantly narrower than individual resonators' loaded bandwidth.
  • This phenomenon is analogous to electromagnetically induced transparency (EIT) in quantum systems.

    • Conclusions:

    • The proposed parallel resonator system provides a basis for highly tunable optical delay lines.
    • The observed ultranarrow resonances stem from constructive and destructive interference effects, similar to EIT.
    • This theoretical work opens avenues for novel optical signal processing and delay applications.