Light resonators imprinted onto optical fibers using multi-photon lithography

The optical fiber sensing field is in continuous seek of new processing methods, light localization structures and transduction mechanisms for developing devices with novel functionalities and/or improved performance, while targeting existing or emerging application fields. Herein, we are reviewing work performed on the imprinting of optical resonators, onto optical fibers using multi-photon, three-dimensional lithography. Two major resonating cavity designs are presented: hollow Fabry-Perot resonators imprinted onto the endface of optical fibers, and micro-ring resonators attached onto micronic diameter optical fiber tapers; both types of devices operate at the 1.5 mu m spectral band. Results are presented on the design, spectral characterization and simulation of those hybrid type of photonic devices, while their sensing capabilities are exemplified in the tracing of organic solvent vapors, which upon case can reach sub-ppm detectivity levels.