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Optical characterization of a SCISSOR device.

Mattia Mancinelli1, Romain Guider, Marco Masi

  • 1Nanoscience Laboratory, Department of Physics, University of Trento, Povo (Trento), Italy.

Optics Express
|July 13, 2011
PubMed
Summary

Researchers developed dual-channel side-coupled integrated spaced sequences of optical resonators (DC-SCISSOR) on silicon photonic wires. They observed coupled resonator induced transparency and high-Q quasi-localized modes, demonstrating tunability.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Nanophotonics

Background:

  • Integrated optical resonators are crucial components in photonic integrated circuits.
  • Coupled resonator induced transparency (CRIT) is a phenomenon observed in coupled resonator systems.
  • Silicon-on-insulator (SOI) platforms offer excellent optical properties for photonic devices.

Purpose of the Study:

  • To design, fabricate, and characterize single-channel (SC-) and dual-channel (DC-) SCISSOR devices.
  • To investigate the optical properties and resonance phenomena in DC-SCISSOR structures.
  • To demonstrate the tunability of these optical modes using thermo-optical and free-carrier effects.

Main Methods:

  • Fabrication of SCISSOR devices with eight microring resonators on SOI wafers using submicron silicon photonic wires.

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  • Characterization of optical transmission spectra at through and drop ports.
  • Analysis of resonance phenomena including CRIT and quasi-localized modes.
  • Demonstration of tunability via thermo-optical and free-carrier refraction effects.

    • Main Results:

    • Observation of multiple resonances in DC-SCISSOR signals due to CRIT when resonator and Bragg bands are coincident.
    • Formation of high-Q (> 23000) quasi-localized modes when resonator and Bragg bands are separated.
    • Attribution of these phenomena to nanometer-scale structural disorders in the microring dimensions.
    • Successful demonstration of tunable resonator and Bragg bands, and localized modes.

    Conclusions:

    • DC-SCISSOR devices exhibit complex resonance behaviors influenced by structural disorder.
    • CRIT and quasi-localized modes can be effectively generated and controlled in these structures.
    • The demonstrated tunability opens possibilities for advanced optical signal processing applications.