Journal
OPTICS COMMUNICATIONS
Volume 282, Issue 17, Pages 3464-3467Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2009.05.071
Keywords
Integrated optics; Resonators; Sidewall corrugation; Quasi-grating
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Funding
- National Natural Science Foundation of China [60777040]
- Shanghai Rising Star Program Phase II [07QH14008]
- Swedish Foundation for Strategic Research (SSF)
- Swedish Research Council
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We build a model to study the sidewall corrugation of fabricated silicon microrings and investigate its impact on the spectral response of the resonator system. From the scanning electron microscope images, the sidewall corrugation can be engineered into certain periodicity and characterized into a group of rectangular gratings, or quasi-gratings, which in turn generate mutual mode coupling between the forward- and backward-propagating modes in the ring and lead to resonance splitting. We find that the reflectivity of the quasi-gratings is proportional to the mutual coupling strength and the resonance splitting only occurs at the resonances where high reflectivity takes place. The model agrees well with the experimental measurements and provides some guideline in applying mutual mode coupling for various functions in the field of optics. (c) 2009 Elsevier B.V. All rights reserved.
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