Abstract

Record high quality (Q) factors of 5400 in vertical microtube ring resonators operated in emission mode are demonstrated. This is achieved by rolling-up a differentially strained SiO2 layer. We also present a theoretical model to investigate the limit of the Q factor. This model especially includes the effect of interlayer voids in the rolled-up geometry, which is found to have a larger effect than scattering due to notches in the spiral shape.

© 2012 Optical Society of America

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