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Adiabatic microring resonators.

Michael R Watts1

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. mwatts@mit.edu

Optics Letters
|October 5, 2010
PubMed
Summary
This summary is machine-generated.

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Adiabatic microring resonators allow for electrical and mechanical contact without radiation loss. These whispering-gallery-mode resonators maintain a pure single radial mode, preserving the free spectral range (FSR).

Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Whispering-gallery-mode (WGM) resonators are crucial for optical sensing and communication.
  • Conventional microring resonators often suffer from radiation losses when electrical or mechanical contacts are introduced.
  • Achieving high-quality factors (Qs) and a clean free spectral range (FSR) is challenging with integrated contacts.

Purpose of the Study:

  • To propose and numerically demonstrate a new class of WGM resonators: adiabatic microrings.
  • To show that adiabatic microrings can incorporate electrical and mechanical contacts without significant radiation loss.
  • To achieve a single radial mode operation and an uncorrupted FSR in microring resonators with integrated contacts.

Main Methods:

  • Numerical demonstration using rigorous finite-difference time-domain (FDTD) simulations.

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  • Design and analysis of adiabatic microring resonator structures.
  • Investigation of resonator performance metrics including quality factor (Q) and free spectral range (FSR).

    • Main Results:

    • Adiabatic microring resonators were successfully proposed and numerically demonstrated.
    • Simulations confirmed that contacts can be made without inducing radiation loss.
    • Resonators with outer diameters as small as 4 μm achieved high Q factors (up to 88,000) and a clean FSR of 8.2 THz.
    • Single radial mode operation was maintained despite large internal contacts.

    Conclusions:

    • Adiabatic microring resonators offer a promising solution for integrated photonic devices requiring robust electrical and mechanical access.
    • The proposed design overcomes the limitations of conventional microrings, enabling high-performance operation with integrated contacts.
    • This advancement paves the way for more practical and scalable on-chip optical systems.