Planar chalcogenide glass waveguides for IR evanescent wave sensors

A. Ganjoo, H. Jain, C. Yu, R. Song, J. V. Ryan, J. Irudayaraj, Y. J. Ding, C. G. Pantano

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87 Scopus citations


Multi-layered chalcogenide glass waveguide structures have been fabricated for evanescent wave sensing of bio-toxins and other sensor applications. Thin films of Ge containing chalcogenides have been deposited onto Si substrates, with a-GeSe2 as the lower cladding layer and a-GeSbSe as the core layer, to form the slab waveguide. The absence of a defined upper cladding layer enhances the leakage necessary to sense the target molecules. Modal refractive index is estimated from the m-lines. It is shown that photo-induced structural changes by 808 nm laser light in the core layer selectively enhance refractive index in the exposed regions, and thus provide a convenient method to form channel waveguides. A thin layer of Au has been deposited on top of the core layer for the attachment of linker molecules for biosensor application; ATR confirms this.

Original languageEnglish (US)
Pages (from-to)584-588
Number of pages5
JournalJournal of Non-Crystalline Solids
Issue number6-7 SPEC. ISS.
StatePublished - May 15 2006

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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