Journal
OPTICS LETTERS
Volume 36, Issue 15, Pages 2862-2864Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.002862
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Funding
- U.S. Army Research Office (USARO) [W911NF-09-1-0450]
- National Science Foundation (NSF) [ECCS-0824067]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0824067] Funding Source: National Science Foundation
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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 (similar to 10(4) in the 1100-1600 nm range) resonances evanescently excited in spheres with diameters of 4-15 mu m. 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 x 10(4) for water immersed 14 mu m BTG spheres. (C) 2011 Optical Society of America
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