Whispering gallery mode microlasers and refractive index sensing based on single polymer fiber

The realization of whispering gallery mode (WGM) lasing in polymer fibers is hindered by an appropriate method to dissolve the polymer and the gain material. In this work, microfibers fabricated by directly drawing from a dye doped polymer solution are exhibited as high quality microlasers and microsensors. Multi-mode and even single-mode lasing is ob- served from the fiber under optical pumping at room tempera- ture. The linewidth of lasing mode is narrower than 0.09 nm. The lasing mechanism is unambiguously verified by comprehensive spectroscopic analysis and ascribed to WGMs. Diameter- and polarization-dependent lasing characteristics are systematically investigated, showing good agreement with the theoretical cal- culation. Particularly, application of the fiber laser for refractive index sensing based on resonant shift of lasing mode is demon- strated and the sensitivity up to about 300 nm/RIU is achieved. The promising potential of high quality polymer microfibers as optical sensors and multi-function components for flexible pho- tonic integrated systems is highly expected.

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