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31 October 2016 Self-assembled dye-doped polymer microspheres as whispering gallery mode lasers
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Microlasers based on high-Q whispering-gallery-mode (WGM) resonances are promising low-threshold laser sources for bio-sensing and imaging applications. In this talk, we demonstrate a cost effective approach to obtain size-controllable polymer microspheres, which can be served as good WGM microcavities. By injecting SU-8 solution into low-refractiveindex UV polymer, self-assembled spherical droplet with smooth surface can be created inside the elastic medium and then solidified by UV exposure. The size of the microspheres can be tuned from several to hundreds of microns. WGM Lasing has been achieved by optically pumping the dye-doped microspheres with ns lasers. Experimental results show that the microsphere lasers have high quality factors and low lasing thresholds. The self-assembled dye-doped polymer microspheres would provide an excellent platform for the micro-laser sources in on-chip biosensing and imaging systems.
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Xiaogang Chen, Hongyi Sun, Hongqin Yang, Xiang Wu, and Shusen Xie "Self-assembled dye-doped polymer microspheres as whispering gallery mode lasers", Proc. SPIE 10024, Optics in Health Care and Biomedical Optics VII, 100242F (31 October 2016);


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