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Integrable wide-free-spectral-range Fabry-Perot optical filters using free-standing LiNbO3 thin films.

R M Roth1, T Izuhara, R L Espinola

  • 1Microelectronics Sciences Laboratory, Columbia University, New York, New York 10027, USA. rothr@cumsl.msl.columbia.edu

Optics Letters
|May 24, 2005
PubMed
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We developed thin films of complex oxide for chip-scale optical filtering. These films act as etalons, offering broad spectral range in a compact size for integrated photonics.

Area of Science:

  • Materials Science
  • Photonics
  • Optical Engineering

Background:

  • Optical filters are crucial components in integrated photonic circuits.
  • Existing technologies often face limitations in spectral range, size, or integration compatibility.

Purpose of the Study:

  • To demonstrate the efficacy of free-standing complex oxide thin films as chip-scale optical filters.
  • To leverage crystal ion slicing for fabricating high-performance etalons.

Main Methods:

  • Fabrication of free-standing complex oxide thin films using crystal ion slicing.
  • Integration of these films as low-order etalons into silica-on-silicon waveguide blocks.
  • Characterization of etalon performance, including free spectral range and footprint.

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Main Results:

  • Demonstrated chip-scale optical filtering using complex oxide thin films.
  • Achieved very large free spectral ranges exceeding 6.78 THz (> 50 nm at 1550 nm).
  • Utilized a small chip area (< 500 microm2) for integrated etalons.

Conclusions:

  • Free-standing complex oxide thin films are suitable for high-performance chip-scale optical filtering.
  • Crystal ion slicing enables the production of compact etalons with broad spectral capabilities.
  • This technology offers a promising solution for advanced integrated photonic devices.