Fiber coupling to BaTiO3 glass microspheres in an aqueous environment.
Opt Lett
; 36(15): 2862-4, 2011 Aug 01.
Article
em En
| MEDLINE
| ID: mdl-21808339
ABSTRACT
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 (â¼10(4) in the 1100-1600 nm 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=3×10(4) for water immersed 14 µm BTG spheres.
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MEDLINE
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En
Ano de publicação:
2011
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Article