NANO PARTICLE-DOPED MICROSPHERES FOR OPTICAL CAVITY

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Ultra-high Quality factor (Q value) can be accomplished in a microsphere as optical cavity structure, thus in the cavity ultimate interaction between light and materials is achieved. The following results were obtained by this research.(1) Excitation of microsphere(a) Optical fiber coupler to a sphere was fabricated by abbreviation of bending single-mode optical fiber that was buried in a resin. High refractive index glass spheres (n_D=1.93) were set up on the coupler, and Resonant Raman scattering originated from optical fiber and glass sphere were observed.(b) Coating was carried out on the high-index glass sphere (n_D=1.93, diameter 30μm), and the terrace portion formed on the coating layer was dramatically increased the Raman scattering intensity. By this sphere, Stimulated Raman emission achieved.(2) Fabrication of nanoparticle-doped maicrospheres.Gold and ZnO nanoparticles was prepared by the sol-gel technique. They can be incorporated stably into the hybrid microspheres.