Reflectivity enhanced refractive index sensor based on a fiber-integrated Fabry-Perot microresonator.
We discuss a fiber-integrated refractive index sensor with strongly improved detection performance. The resonator has been implemented by means of focused-ion beam milling of a step index fiber and shows a sensitivity of about 1.15µm/RIU. Coating the resonator walls led to a strongly improved mirror reflectivity by a factor of about 26. Design rules for device optimization and a detailed mathematical analysis are discussed, revealing that the sensor operates as an optimized Fabry-Perot resonator. We also show that the performance of such kind of Fabry-Perot sensors is, in general, limited by the detection limit function - a quantity depending on the cavitiy's finesse and on the measurement capabilities used.
T
T
Wieduwilt
J
J
Dellith
F
F
Talkenberg
H
H
Bartelt
M A
MA
Schmidt
D005336:Fiber Optic Technology / Q000295:instrumentation*; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D008904:Miniaturization / Q000295:instrumentation*; D008962:Models, Theoretical; D055100:Optical Fibers; D055620:Optical Phenomena; D012031:Refractometry / Q000295:instrumentation*; D059629:Signal-To-Noise Ratio