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Scanning electron microscopy of a straight waveguide cross section.
Plot of peak positions against ring radius. Inset: Area-normalized PL spectra (spectra are offsetted for clarity) for rings with radii from and for a straight waveguide.
Pump power-dependent PL plots for ring radius (spectra are offsetted for clarity and normalized to unit area). The baseline in the vicinity of the resonances is fitted to a cubic polynomial which is subtracted from the PL spectra. The is then computed from a Lorentzian fit of the remaining resonance. Inset: Ring against pump power for radii .
Relative peak to baseline intensity against for radii 0.61 and in logarithmic scale.
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