抄録
We present self-assembled conjugated polymer microspheres that act as whispering gallery mode
(WGM) resonators. For the preparation of conjugated polymer microspheres, vapor diffusion and
miniemulsion methods are adopted. For the vapor diffusion method to obtain microspheres, amorphous
aggregation of the polymers are crucial by introducing sterically bulky moieties that largely twists the
polymer main chain. Focused laser irradiation to the perimeter of the microspheres excites WGM, where
sharp and periodic lines appear in the PL spectrum. With a benefit of the high light confinement
properties, we demonstrate long distance, directional, and efficient light energy transfer and wavelength
conversion through bispheres. Furthermore, WGM lasing is achieved from conjugated polymer
microspheres upon femtosecond pumping. Conjugated polymer microsphere resonators have advantages
of high photoabsorptivity, high refractive index, and inherent conducting properties, as well as the simple
fabrication process, which are valuable for applications to optical circuits, electrically-driven lightings,
and chemical and biological sensors
