Abstract
Mode coupling and the control of mode Q factor and threshold gain are analyzed
for nanocircular resonators confined by isolation and metallic layers based on solving
eigenvalue equation for multiple-layer structure circular resonators. For nanocircular
resonators only confined by a metallic layer, the metallic layer can enhance the mode
confinement for transverse magnetic (TM) whispering-gallery modes (WGMs) and result in
high Q TM WGMs. But transverse electric (TE) WGMs can form hybrid modes of surface
plasmon polaritons and dielectric modes, with the mode Q factors limited by the
metallic layer absorption. By introducing a low index isolation layer between the
resonator and the metallic layer, we can greatly enhance the mode Q factors for TE
WGMs. However, the mode coupling between different radial modes and the variation of the
optical confinement factor in the active layer can result in the oscillation of the mode
Q factor and threshold gain versus the isolation layer thickness. The optimization of
the isolation layer thickness is important to enhance the mode Q factor and the
optical confinement factor for realizing low threshold gain.
© 2012 IEEE
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