Abstract
Among potential inorganic thin films, perovskite-structured barium titanate (BaTiO3) is particularly attractive due to its large ferroelectric response and large optical nonlinear coefficients. SiO2 material is also important in semiconductor processing. Therefore, we study the nonlinear optical (NLO) thin film deposited on a SiO2 substrate. We report our investigation of a BaTiO3 thin film on a silica glass (SiO2) substrate grown by rf magnetron sputtering. We measured the second-harmonic generation (SHG) and calculated the second-order nonlinear optical coefficients from the BaTiO3/glass by using the Maker fringes technique. From our experimental results, we found that by applying corona poling, the nonlinear optical coefficients in BaTiO3/glass can be increased. The SHG of the nonlinear thin film by poling is dependent on temperature.
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