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Compact modulated and tunable microdisk laser using vertical coupling and a feedback loop.

F Mandorlo1, P Rojo Romeo, X Letartre

  • 1Université de Lyon, Institut des Nanotechnologies de Lyon INL-UMR5270 CNRS, Ecully, France. Fabien.Mandorlo@EC-Lyon.fr

Optics Express
|October 14, 2010
PubMed
Summary
This summary is machine-generated.

This study optimizes vertical coupling in microdisk resonators and waveguides. Exploiting coupling losses enhances high-quality factor modes and enables compact, selective devices.

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Area of Science:

  • Photonics and Optical Engineering
  • Nanotechnology
  • Integrated Optics

Background:

  • Microdisk resonators are key components in integrated optics.
  • Efficient coupling between resonators and waveguides is crucial for device performance.
  • Understanding vertical coupling is essential for optimizing light manipulation.

Purpose of the Study:

  • To analyze vertical coupling conditions between microdisk resonators and waveguides.
  • To optimize coupling efficiency and explore its impact on resonator modes.
  • To propose novel waveguide designs for enhanced mode selectivity and compactness.

Main Methods:

  • Utilizing an analytical model to study vertical coupling.
  • Performing 3D Finite-Difference Time-Domain (FDTD) computations for validation.
  • Investigating coupling loss effects on resonator modes.
  • Proposing waveguide shape modifications.

Main Results:

  • Optimized vertical coupling conditions were identified.
  • Coupling losses were shown to enhance high-quality factor modes.
  • A modified waveguide shape improved mode selectivity.
  • A compact structure with mode hopping capabilities was achieved.

Conclusions:

  • Vertical coupling in microdisk resonators can be precisely controlled.
  • Exploiting coupling losses offers a method for mode selection.
  • Novel waveguide designs lead to more compact and selective photonic devices.
  • The proposed structures are expected to enable lower thresholds and improved modulation.