Patent ID: 7642040
Filing Date: 2010-01-05
Classification: G03F

Abstract:
1. A fabrication method of a periodic domain inversion structure, comprising: providing a substrate, wherein the substrate is a nonlinear optical ferroelectric material; forming a photoresist layer on an upper surface and a lower surface of the substrate; exposing the photoresist layer on the upper surface of the substrate by using a plurality of periodic gratings formed by interference of two laser beams and exposing the photoresist layer on the lower surface of the substrate by using the gratings formed by the two laser beams passing through the substrate; performing a development process to form a periodic photoresist pattern on the upper surface and the lower surface of the substrate; forming a conductive layer on the substrate to cover the photoresist pattern and the exposed substrate surface; removing the photoresist pattern and a portion of the conductive layer thereon by a lift-off technique; and applying a voltage to the substrate via the remaining conductive layer to polarize parts of the substrate.