Single stage ultrafast laser inscription of a side-polished fiber-like waveguide sensor

Stephen J. Beecher*, Robert R. Thomson, Bishnu P Pal, Ajoy Kumar Kar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Ultrafast laser inscription (ULI) has been used to fabricate an 18 mm long sub-surface optical waveguide in fused silica. The waveguide started and terminated 75 mu m below the substrate surface, approaching it to a minimum depth of 6 +/- 1 mu m for the central section. The device was fabricated in a single step, exhibiting a fiber-to-fiber insertion loss of 2.6 dB. When a high refractive index oil was placed on the substrate surface, the polarization-averaged waveguide insertion loss increased by 3.7 dB. This work demonstrates that a single ULI stage can be used to fabricate optical waveguides sufficiently close to a substrate surface for evanescent field sensing applications.

Original languageEnglish
Pages (from-to)1263-1266
Number of pages4
JournalIEEE Sensors Journal
Issue number5
Publication statusPublished - May 2012


  • optical sensing
  • femtosecond laser writing
  • side-polished fiber
  • Buried optical waveguides


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