Fiber coupling to BaTiO3 glass microspheres in an aqueous environment

O. Oleksiy Svitelskiy, Yangcheng Li, Arash Darafsheh, Misha Sumetsky, David Carnegie, Edik Rafailov, Vasily N. Astratov

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Compact microspheres with high-quality (Q) whispering gallery modes are required for many applications involving liquid immersion, such as sensing nanoparticles and studying resonant radiative pressure effects. We show that high-index (1.9 and 2.1) barium titanate glass (BTG) microspheres are perfect candidates for these applications due to their high-Q (∼104 in the 1100-1600nm range) resonances evanescently excited in spheres with diameters of 4-15 μm. By reattaching the spheres at different positions along a tapered optical fiber, we show that the coupling constant exponentially increases with thinner fiber diameters. We demonstrate the close to critical coupling regime with intrinsic Q = 3 × 104 for water immersed 14 μm BTG spheres.

Original languageEnglish
Pages (from-to)2862-2864
Number of pages3
JournalOptics Letters
Issue number15
StatePublished - Aug 1 2011
Externally publishedYes

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    Svitelskiy, O. O., Li, Y., Darafsheh, A., Sumetsky, M., Carnegie, D., Rafailov, E., & Astratov, V. N. (2011). Fiber coupling to BaTiO3 glass microspheres in an aqueous environment. Optics Letters, 36(15), 2862-2864.