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出典:『Wikipedia』 (2011/05/31 20:33 UTC 版)

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Spreeta is an electro-optical device utilizing surface plasmon resonance to detect small changes in refractive index of liquids. The Spreeta device was developed by Texas Instruments, Inc. in the 1990s. Device design incorporates a light-emitting diode (LED) illuminating a thin metal film (usually gold) in the Kretchmann geometry (needed to excite surface plasmons). The reflected light is detected by a photodiode linear array (which translates angle of reflection to pixel position) and the resonance (a dip in the reflectivity at a specific angle of incidence) denotes the refractive index on the outer surface of the metal film. Applications include real-time measurement of binding of antigens to antibodies attached to the sensor surface, monitoring changes in oil quality, and measuring sugar content in drinks (Brix level).