Lasing of Poly(3-alkylthiophene) in Microcapillary Geometry

We have demonstrated the lasing of poly(3-alkylthiophene) thin films in microcapillaries. The microcavities in the microcapillaries have excellent advantages over conventional microrings. The inner emission layer is covered and protected from the outside environment only by enclosing glass tube. A high-quality polymer thin film could be obtained by spontaneous capillary action at the inside surface of the microcapillary. We also compared the microcapillary with conventional microring structures by spectral analysis using a Fourier transform.