Open AccessWhispering gallery mode spectra of channel waveguide coupled microspheres
Author(s) -
Yuwapat Panitchob,
Ganapathy Senthil Murugan,
M.N. Zervas,
Péter Horák,
Simone Berneschi,
S. Pelli,
G. Nunzi Conti,
James S. Wilkinson
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.011066
Subject(s) - whispering gallery wave , optics , planar , resonator , radius , materials science , glass microsphere , waveguide , coupled mode theory , wavelength , coupling (piping) , refractive index , spectral line , core (optical fiber) , microsphere , physics , engineering , computer graphics (images) , computer security , astronomy , chemical engineering , computer science , metallurgy
Evanescent coupling of light from glass channel waveguides into the whispering gallery modes of glass microspheres of radius 15?m and 100?m 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.