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Three-dimensional photonic crystals by large-area membrane stacking.

Ling Lu1, Lin Lee Cheong, Henry I Smith

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

Optics Letters
|November 21, 2012
PubMed
Summary

We developed a novel 3D photonic crystal with a 12.4% bandgap using a mesh-stack design. This structure enables robust single-mode waveguides compatible with advanced fabrication methods.

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Area of Science:

  • Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Three-dimensional (3D) photonic crystals offer unique light manipulation properties.
  • Achieving large bandgaps and fabrication compatibility remains a challenge in 3D photonic crystal design.

Purpose of the Study:

  • To design and analyze a novel mesh-stack 3D photonic crystal structure.
  • To achieve a significant bandgap and demonstrate robust waveguide properties.

Main Methods:

  • Designed a mesh-stack structure with four offset square-lattice membranes per vertical period.
  • Analyzed bandgap properties under in-plane misalignment using the membrane-stacking fabrication compatibility.
  • Introduced a linear defect with nonsymmorphic symmetry to create a waveguide.

Main Results:

  • Achieved a 12.4% bandgap with a dielectric contrast of 12:1.
  • The bandgap is preserved with in-plane misalignment up to 3% of the lattice period.
  • Demonstrated a single-mode waveguide with a wide bandwidth by introducing a linear defect.

Conclusions:

  • The mesh-stack 3D photonic crystal design is compatible with membrane-stacking fabrication.
  • This design offers a robust platform for creating efficient photonic devices.
  • The demonstrated waveguide properties are promising for integrated photonic applications.