Exploitation of multilayer coatings for infrared surface plasmon resonance fiber sensors.
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 dB and an estimated index sensitivity of Delta lambda/Delta n=90 nm from 1 to 1.15 index range, while others provided an index sensitivity of Delta lambda/Delta n=6790 nm for refractive indices from 1.33 to 1.37.
Allsop
T
T
Photonics Research Group, Aston University, Aston Triangle, Birmingham, B4 7ET, UK. t.d.p.allsop@aston.ac.uk
Neal
R
R
Mou
C
C
Brown
P
P
Saied
S
S
Rehman
S
S
Kalli
K
K
Webb
D J
DJ
Sullivan
J
J
Mapps
D
D
Bennion
I
I
D004867:Equipment Design; D005857:Germanium / Q000737:chemistry; D015233:Models, Statistical; D055100:Optical Fibers; D055095:Optics and Photonics; D012031:Refractometry; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods; D014466:Ultraviolet Rays
D005857:Germanium; D012834:Silver; D012822:Silicon Dioxide