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Planar Bragg grating in bulk polymethylmethacrylate.

M Rosenberger1, G Koller, S Belle

  • 1Laboratory for Photonic Technologies and Sensing, University of Applied Sciences Aschaffenburg, Aschaffenburg, Germany. manuel.rosenberger@h-ab.de

Optics Express
|December 25, 2012
PubMed
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Researchers developed a one-step method to create a planar waveguide with a Bragg grating in Polymethylmethacrylate (PMMA). This technique simultaneously fabricates the waveguide and grating, achieving 80% reflectivity at 1558.5 nm.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Laser Physics

Background:

  • Planar waveguides are essential components in integrated optics.
  • Bragg gratings are crucial for wavelength-selective optical devices.
  • Fabrication of integrated optical components often requires multiple complex steps.

Purpose of the Study:

  • To report a novel one-step fabrication process for a planar waveguide with an integrated Bragg grating.
  • To demonstrate simultaneous generation of both the waveguide and grating structure.
  • To investigate the initial performance and environmental sensitivity of the fabricated Bragg grating.

Main Methods:

  • Utilized a KrF excimer laser for material modification.
  • Employed a phase mask combined with an amplitude mask for precise structuring.

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  • Induced local refractive index changes in bulk Polymethylmethacrylate (PMMA).

    • Main Results:

    • Successfully fabricated a planar waveguide with an embedded Bragg grating in a single step.
    • Achieved a reflected wavelength of approximately 1558.5 nm, consistent with the phase mask design.
    • Demonstrated a high grating reflectivity of about 80%.
    • Initiated an investigation into the Bragg grating's response to humidity variations.

    Conclusions:

    • The one-step laser-based writing process is effective for creating integrated Bragg gratings within planar waveguides in PMMA.
    • The fabricated gratings exhibit high reflectivity and a predictable resonant wavelength.
    • Further research is warranted to fully characterize the environmental stability and potential applications of these structures.