We propose a new concept for surface plasmon sensing using a surface plasmon interferometer.
The high field enhancement of surface plasmons near the metallic interface makes
them ideal for use in bio- and chemical sensors where a very small change in refractive
index should be detected. To our knowledge this is the first time that the SOI material system
has been combined with the SPR technique for sensing purposes. The device is two
orders of magnitude smaller than current integrated SPR sensors. We obtain a theoretical
limit of detection of 10−6 RIU for a component of length 10 µm.
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