Originally I cut my peizo throughout. But andrei101 recommended only cut the top conducting layer such that the integraty of peizo crystal is preserved to the largest extend. So I look into that option.
Without cut, the conducting layer has a resistance of 0.3, but with just a thin cut, it is open circuit.
This serves our purpose perfectly. When a voltage is applied, only that particular region of peizo is engaged for the scanning movement. And with such a thin cut, the peizo remain in almost perfect conditions, without the minor cracks that inevitably develop during the deep cut process.
Thank you andrew101!! I owe you one.
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