March 20, 2006
Journal Article

Planar chalcogenide glass waveguides for IR evanescent wave sensors

Abstract

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.

Revised: February 10, 2012 | Published: March 20, 2006

Citation

Ganjoo A., H. Jain, C. Yu, R. Song, J.V. Ryan, C.J. Irudayaraj, and Y.J. Ding, et al. 2006. Planar chalcogenide glass waveguides for IR evanescent wave sensors. Journal of Non-crystalline Solids 352, no. 6-7:584-588. PNNL-SA-85373. doi:10.1016/j.jnoncrysol.2005.12.010