A tapered thin film of Ta2O5 was deposited by the masked sputtering method on a single-mode slab glass waveguide to form a composite optical waveguide （COWG） with a great modal birefringence. With the prism-coupling...A tapered thin film of Ta2O5 was deposited by the masked sputtering method on a single-mode slab glass waveguide to form a composite optical waveguide （COWG） with a great modal birefringence. With the prism-coupling method the COWG was used as an integrated polarimetric interferometer for real-time detection of chemical and biological measurands. The refractive-index sensitivity of the interferometer was examined, and the refractive-index increments of different aqueous solutions were determined with the device. Response of the interferometer to protein adsorption and that to water temperature were investigated. The experimental results indicate that an increase of ΔT = 1°C for the temperature of water in the measuring chamber can lead to a phase-difference change of Δ = -28.5°展开更多
基金Supported by the National Basic Research Program of China under Grant No 2009CB320300, the National Natural Science Foundation of China under Grant No 60978042, and the One-Hundred Talents Program of Chinese Academy of Sciences.
文摘A tapered thin film of Ta2O5 was deposited by the masked sputtering method on a single-mode slab glass waveguide to form a composite optical waveguide （COWG） with a great modal birefringence. With the prism-coupling method the COWG was used as an integrated polarimetric interferometer for real-time detection of chemical and biological measurands. The refractive-index sensitivity of the interferometer was examined, and the refractive-index increments of different aqueous solutions were determined with the device. Response of the interferometer to protein adsorption and that to water temperature were investigated. The experimental results indicate that an increase of ΔT = 1°C for the temperature of water in the measuring chamber can lead to a phase-difference change of Δ = -28.5°
