Abstract
A fiber optic chemical sensor based on gold-island surface plasmon excitation is presented. The sensing part of the fiber is the end of the fiber onto which a thin layer of gold has been deposited to form a particulate surface. Annealing the gold reshapes the particles and produces an optical absorbance near 535 nm with the fiber in air. The optical absorption resonance of the gold particles is shifted if the fiber is immersed in a medium other than air. These resonance shifts are examined by transmission spectroscopy through the fiber. Experimental results for the sensitivity and dynamic range in the measurement of liquid solutions are in agreement with a basic theoretical model which characterizes the surface plasmon using nonretarded electrodynamics.
| Original language | English |
|---|---|
| Pages (from-to) | 214-223 |
| Number of pages | 10 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3860 |
| State | Published - 1999 |
| Externally published | Yes |
| Event | Proceedings of the 1999 Fiber Optics Sensors Technology and Applications - Boston, MA, USA Duration: Sep 20 1999 → Sep 22 1999 |