Abstract
In this paper we propose an efficient technique for micromachining lithium
niobate that is used in Ti-diffused waveguides. The use
of Focused Ion Beam (FIB) etching allows obtaining homogeneous periodic
microstructures. Bragg gratings with a period of 1.05 µm and an aspect ratio of 6:1 (depth-to-half period ratio) have
been achieved. A reflectivity greater than 95% associated with a bandwidth
at half maximum of about 100 nm within a window centered at 1550 nm, is
demonstrated for a Bragg grating of period Λ = 1.8 µm and a length of 144 µm, in good agreement with theoretical predictions.
© 2010 IEEE
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