The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 17 1 2019 11 26 Analysis of influence of wall defect in lithium niobate ridge waveguide Analysis of influence of wall defect in lithium niobate ridge waveguide 61 71 1234 10.18869/acadpub.ijpr.17.1.61 FA Hadi Dehghan Nayeri Reza Asadi Mohammad Malek Mohammad Journal Article 2019 11 26 In this research, the capability of new approach of making ridge waveguides in lithium niobate by Argon physical etching and diffusion of titanium is investigated. For this purpose, the proportion of light mode confinement in the ridge section is measured and compared to simulation results. Also the effect of ridge wall defects -which is a challenge of this kind of waveguides- in light power dissipation, is simulated. The ridge height reaches 2.5µm and the defects of ridge walls are measured to be about 200nm on average. In this research, by simulation of titanium diffusion and refractive index change of the waveguide it is demonstrated that although the defects exist in the ridge walls, by using appropriate diffusion depth of titanium and refractive index distribution, light power dissipation less than 3 dB/cm can be reached while mode confinement in the ridge section is more than 50 percent. In this research, the capability of new approach of making ridge waveguides in lithium niobate by Argon physical etching and diffusion of titanium is investigated. For this purpose, the proportion of light mode confinement in the ridge section is measured and compared to simulation results. Also the effect of ridge wall defects -which is a challenge of this kind of waveguides- in light power dissipation, is simulated. The ridge height reaches 2.5µm and the defects of ridge walls are measured to be about 200nm on average. In this research, by simulation of titanium diffusion and refractive index change of the waveguide it is demonstrated that although the defects exist in the ridge walls, by using appropriate diffusion depth of titanium and refractive index distribution, light power dissipation less than 3 dB/cm can be reached while mode confinement in the ridge section is more than 50 percent. https://ijpr.iut.ac.ir/article_1234_81dc9bdb52d04dc20036dbd8313ed055.pdf