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3 March 2015 Hydrogen gas sensing using palladium-coated microdisk microresonators
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An SU-8 polymer microdisk resonator coated with a palladium (Pd) layer and coupled to a single-mode optical waveguide is used to as a hydrogen (H2) gas sensor. In the presence of H2, a red shift is observed in the spectral positions of the microdisk whispering gallery modes (WGMs) due to the expansion in the Pd lattice. H2 concentrations below the flammable limit (4%) down to 0.3% could be detected in nitrogen atmosphere at room temperature. For H2 concentrations between 0.3 − 1%, WGM spectral positions shifted linearly with H2 concentration at a rate of 32 pm/%H2. Average response time of the devices was measured to be 50 s for 1% H2. The proposed device concept can also be used to detect different chemical gases by using appropriate sensing layers.
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Mustafa Eryurek, Yasin Karadag, Nevin Taşaltın, Necmettin Kilinç, and Alper Kiraz "Hydrogen gas sensing using palladium-coated microdisk microresonators", Proc. SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII, 93430J (3 March 2015);

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