SIMS analysis of Rb-doped hollow-core photonic band-gap silica fiber using a CAMECA 4550 instrument

摘要

A hollow-core photonic band-gap fiber exposed to Rb vapor was studied using quadrupole-based SIMS. The Rb concentration along 30-cm fibers was analyzed using a Cs~+ beam. Effective charge compensation was obtained in the fiber cross-section without using any metal coating. A low Rb detection limit of about 6 × 10~(15) atoms/cm~3 was obtained in the silica microstructure region of the fiber. SIMS results revealed variations in the longitudinal distribution of Rb in fibers exposed to different loading conditions. Ion imaging of the fiber cross-section using a Ga~+ beam revealed the confinement of Rb atoms to the microstructured photonic region of the fiber, as opposed to the solid glass cladding.