UV photosensitivity in a Ta2O5 rib waveguide Mach-Zehnder interferometer

Chao Yi Tai, Christos Grivas, James S. Wilkinson

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14 Scopus citations


The ultraviolet (UV) photosensitivity of Ta2O5 measured in a rib waveguide Mach-Zehnder interferometer (MZI) is reported. With a cumulative fluence of 72 J/cm2 at a wavelength of 248 nm incident upon one arm through a 3-mm-long window, the MZI exhibits a phase shift of 8π radians at wavelength λ = 1.55 μm, corresponding to a saturated refractive index change of 2.1 × 10-3. Real time measurements of the MZI output during exposure are given and the UV-induced refractive index change is found to be negative.

Original languageEnglish
Pages (from-to)1522-1524
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number6
StatePublished - Jun 2004


  • Integrated optics
  • Mach-Zehnder interferometer (MZI)
  • Photosensitivity
  • Planar lightwave circuits


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