Method for preparing a periodically poled structure
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United States of America Patent
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Feb 3, 2009
Grant Date -
Sep 11, 2008
app pub date -
Mar 8, 2007
filing date -
Mar 8, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A method for preparing a periodically poled structure according to this aspect of the present invention comprises the steps of providing a ferroelectric substrate and performing a poling process by applying a poling current to at least one portion of the ferroelectric substrate according to a current waveform. The current waveform include a major phase and a tailed phase accompanying the major phase; the major phase has at least one peak current (Ip) and terminates when the current drops substantially equal to Ip/e, and the charge delivered to the portion of the ferroelectric substrate during the major phase is larger than that delivered during the tailed phase. The nucleation phase is configured to generate nucleation sites in the portion of the ferroelectric substrate and the spreading phase is configured to increase the size of the nucleation sites.
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