Abstract

We demonstrate surface plasmon resonance (SPR) fiber devices based upon ultraviolet inscription of a grating-type structure into both single-layered and multilayered thin films deposited on the flat side of a lapped D-shaped fiber. The single-layered devices were fabricated from germanium, while the multilayered ones comprised layers of germanium, silica, and silver. Some of the devices operated in air with high coupling efficiency in excess of $40\mathrm{dB}$ and an estimated index sensitivity of $\mathrm{\Delta }\lambda /\mathrm{\Delta }n=90\mathrm{nm}$ from 1 to 1.15 index range, while others provided an index sensitivity of $\mathrm{\Delta }\lambda /\mathrm{\Delta }n=6790\mathrm{nm}$ for refractive indices from 1.33 to 1.37.

© 2009 Optical Society of America