Abstract

A low propagation loss waveguide structure was fabricated on lithium niobate crystal using 70 MeV argon-ion irradiation with a low fluence of 1 × 1012 ions/cm2. Guided modes were detected in visible and near-infrared regions; the propagation loss at 633 nm is ∼0.8 dB/cm. meaning this waveguide can be used for visible and near-infrared communications The Raman spectra of the waveguide layer and substrate indicate the lithium niobate lattice structure has been preserved after the low dose argon-ion irradiation. The results indicated that the low fluence Ar-ion can be used for optical waveguide fabrication on lithium niobite crystal.

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