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Whispering gallery mode spectra of channel waveguide coupled microspheres
Y.Panitchob1, G.Senthil Murugan1, M.N.Zervas1, P.Horak1, S.Berneschi2, S.Pelli2, G.Nunzi Conti3, and J.S.Wilkinson1
1. Optoelectronics Research Centre, University of Southampton, UK
2. MDF Laboratory, "Nello Carrara" Institute of Applied Physics, IFAC-CNR Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy
3. Centro Studi e Ricerche "Enrico Fermi", Piazzale del Viminale 2, 00184 Roma, Italy
Abstract
Evanescent coupling of light from glass channel waveguides into the whispering gallery modes of glass microspheres of radius 15 μm and 100 μm is studied experimentally at wavelengths near 1550 nm. Fitting the positions, widths and heights of resonances in the experimental spectra to the characteristic equation for microsphere modes and to universal coupled microresonator theory, we establish sphere radius and index, identify mode numbers, and determine losses. The results provide detailed information for the design of optical devices incorporating microsphere resonators in planar lightwave circuits.
Optics Express (2008) Vol.16(15) pp.11066-11076
doi: 10.1364/OE.16.011066
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Copyright University of Southampton 2006