Analytical Sciences

Characteristics of Sensor Response of a DifferenceInterferometric Slab Optical Waveguide Refractive Index Sensor with a PrismCoupling Method

Takashi KATSU *, Takeshi HASHIMOTOand Shima HIRAMAKI

Kin-ichi TSUNODA * , Sae KIKUCHI, Kiyohisa NOMURA, Katsuyuki AIZAWA, Kanae OKAMOTOand Hideo AKAIWA
Department of Chemistry,Gunma University, Kiryu 376-8515, Japan

We developed a difference interferometric slaboptical waveguide (SOWG) refractive index (RI) sensor for flow analysiswhich used a prism coupling method. The highest sensitivity of7.2x10^-7 (deltaRI unit) was obtained with a glass SOWGfabricated with a radio frequency sputtering method for solution samplessuch as sucrose solutions and mixtures of ethanol and water; heresensitivity was defined as the DRI which gives the signal intensity of10^-4 in absorbance unit. The sensitivity is almost the samelevel as that of a surface plasmon resonance sensor.

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