Images of microsphere attached to fiber taper from the (a) top view and (b) side view in the plane normal to the direction of propagation of light in the waveguide.
Measurement setup used for the optical coupling from planar waveguide to microsphere resonator and resonance characterization.
Resonance spectra of a microsphere coupled to a planar waveguide at various Teflon (x) separations.
Measured (a) Q-factor, (b) peak (scattered) power, and (c) resonance peak wavelength shift of microsphere at various Teflon thicknesses for the , 2, and 3 resonances closest to 1465 nm.
Resonance spectra of a microsphere at various distances from the center of the waveguide (on both sides) at Teflon thickness of 460 nm.
Q-factor of the microsphere at various distances from the center of the waveguide for three different Teflon thicknesses at a wavelength of 1550 nm.
Experimentally measured resonance spectrum and theoretically fitted curves for the microsphere at 330 nm Teflon thickness and from the waveguide center. The figure also shows the assigned radial and azimuthal mode numbers of various resonance peaks for the TM polarization.
Coupling factor estimated as a result of the overlap integration for various radial modes at about 1445 nm at various Teflon separations.
Calculated normalized circulating power and averaged scattered peak power for various radial modes at various Teflon separations.
Image of the microsphere resonator showing ellipticity and angular misalignment.
Detail of the resonance spectrum for resonances near 1455 nm with the sphere separated from the waveguide by 70 nm Teflon, and for lateral positions between . (a) mode, (b) mode, and (c) mode.
Detail of the resonance spectrum for resonances near 1455 nm with the sphere centered above the waveguide for separations of 0–740 nm. (a) mode, (b) mode, and (c) mode.
Experimental and theoretical resonant wavelengths and assigned microsphere mode numbers ( and ).
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