Abstract

A micrometric Fabry–Perot refractometer based on an end-of-fiber polymer tip is proposed. The fiber tip, with a length of $36\mu \text{m}$, was fabricated by self-guiding photopolymerization. The two-wave interferometric operation was achieved by combining the light waves generated at the interface between the single-mode fiber and the polymer tip, and at the fiber tip end (Fresnel reflection). The Fabry–Perot interferometer is coherence addressed and heterodyne interrogated, resulting into a liquid refractive index resolution of $\approx 7.5\times {10}^{-4}$.

© 2009 Optical Society of America

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