Photon recycling in Fabry-Perot micro-cavities based on Si 3N4 waveguides

F. Riboli*, A. Recati, N. Daldosso, L. Pavesi, G. Pucker, A. Lui, S. Cabrini, E. Di Fabrizio

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We present a numerical analysis and preliminary experimental results on one-dimensional Fabry-Perot micro-cavities in Si3N 4waveguides. The Fabry-Perot micro-cavities are formed by two distributed Bragg reflectors separated by a straight portion of a waveguide. The Bragg reflectors are composed of a few air slits produced within the Si 3N4 waveguides. In order to increase the quality factor of the micro-cavities, we have minimized, with a multiparametric optimization tool, the insertion loss of the reflectors by varying the length of their first pairs (those facing the cavity). To explain the simulation results, the coupling of the fundamental waveguide mode with radiative modes in the Fabry-Perot micro-cavities is needed. This effect is described as a recycling of radiative modes in the waveguide. To support the modelling, preliminary experimental results of micro-cavities in Si3N4 waveguides realized with the focused ion beam technique are reported.

Original languageEnglish (US)
Pages (from-to)41-46
Number of pages6
JournalPhotonics and Nanostructures - Fundamentals and Applications
Issue number1
StatePublished - Feb 2006
Externally publishedYes

Bibliographical note

Funding Information:
We acknowledge the financial support by MIUR through FIRB (RBNE01P4JF and RBNE012N3X) and COFIN (2004023725) projects and by PAT through PROFILL project.


  • Engineered mirrors
  • Fabry-Perot micro-cavities
  • Recycling of leaky modes
  • Waveguide photonic crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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