Abstract
We propose an optical method to quantify the level of fabrication imperfections
in a Silicon On Insulator wafer. The method is based on the use of Side Coupled
Integrated Spaced Sequence of Resonators (SCISSOR) as test devices. Fabrication
induced fluctuations of the effective index and of the coupling coefficient
are mapped by comparing different spectral responses of nominally identical
samples taken from different dies in the wafer. Random variations of the resonator's
optical path are quantified in terms of standard deviations of normally distribuited
variables by finding a statistical correlation with the coupled resonator
induced transparency (CRIT) phenomena. We found a strong correlation between
CRIT and fabrication errors. This led us to design a SCISSOR based test structure
that allows to quantify the degree of local structural imperfections in a
fast, accurate and non invasive way. Performances, possible applications and
limitations are investigated with the help of transfer matrix simulations.
© 2013 IEEE
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