Abstract
We present here a parametric study of micrometric size waveguides on 700-nm thin-film lithium niobate. Four different configurations in which the guiding takes place in lithium niobate, ridge waveguide, strip-loaded waveguide, slot waveguide and double slot waveguide, are systematically investigated in order to find a good set of optimum guiding parameters for increasing light–matter interaction applications. Our study shows that lithium niobate slot waveguides present high confinement of light in nano-scale guiding cross section and that they are a promising host waveguide for enhanced nonlinear optical applications. However, if one needs a compromise between light confinement and easy fabrication, we believe that strip-loaded lithium niobate waveguides, in which the strip load is fabricated with a dielectric material with an index of refraction smaller than lithium niobate, could be a good choice since in this case, the lithium niobate part does not need to be etched.
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