A monolithic diode laser chemical sensor with a quasi-symmetrical sensing waveguide for improved sensitivity

Wang, C. S.; Nolde, J. A.; Lofgreen, D. D.; Coldren, L. A.; Cohen, D. A.
July 2004
Applied Physics Letters;7/12/2004, Vol. 85 Issue 2, p320
Academic Journal
We demonstrate a diode laser chemical sensor incorporating a self-aligned, symmetrically clad high index contrast evanescent field sensing waveguide. This is accomplished by selectively oxidizing the lower cladding layer of the sensing waveguide. An analyte overlap of 4.8% is obtained with a tightly confined mode, ideal for sensitive affinity assays.


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