Ridge waveguides and electro-optical switches in LiNbO3fabricated by ion-bombardment-enhanced etching

Narrow ridge waveguides with
\sim 2-\mu
m width have been fabricated in Ti-diffused
LiNbO_3
by ion-bombardment-enhanced etching and the intensity modulation by switching the waveguide from guided mode to radiation mode through electro-optic effect has been demonstrated. The extinction coefficient of
-19 dB
was obtained at the applied voltage of
\pm
10 V.