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Related Experiment Videos

Vertically coupled photonic crystal optical filters.

Min Qiu1

  • 1Laboratory of Optics, Photonics, and Quantum Electronics, Department of Microelectronics and Information Technology, Royal Institute of Technology, Electrum 229, 16440 Kista, Sweden. min@imit.kth.se

Optics Letters
|July 13, 2005
PubMed
Summary

A new optical filter design uses vertical coupling between waveguides and photonic crystal microcavities. This flexible design allows for arbitrary waveguide choices and controllable separation for precise filter bandwidths and efficiencies.

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Area of Science:

  • Photonics and optical engineering
  • Materials science

Background:

  • Conventional optical filters face limitations in design flexibility and precise control.
  • Integrating channel waveguides with photonic crystal microcavities offers potential for novel filter functionalities.

Purpose of the Study:

  • To propose and numerically demonstrate a novel optical filter design based on vertical coupling.
  • To explore the design flexibility and controllability of such optical filters.

Main Methods:

  • Utilizing the finite-difference time-domain (FDTD) method for numerical simulations.
  • Designing optical filters with vertical coupling between channel waveguides and photonic crystal microcavities.

Main Results:

  • Demonstrated a reflection-type optical filter design.

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  • Showcased the flexibility in choosing channel waveguides.
  • Highlighted the accurate control over waveguide-microcavity separation for tuning filter characteristics.
  • Indicated potential for switchable filters through mechanical microcavity movement.

    • Conclusions:

    • The proposed optical filter design offers significant flexibility and precise control over performance parameters.
    • This design enables the use of conventional low-loss waveguides.
    • The potential for switchable filters opens avenues for dynamic optical signal processing.