Second-harmonic generation of poled BaTiO3 thin films

Abstract

Second-harmonic generation of 1.064 μm incident light was measured on BaTiO3 thin films prepared by metalorganic chemical vapor deposition. Upon corona poling of the film, the second-harmonic signal was significantly enhanced. The second-order nonlinear optical susceptibility, d, of the poled film reaches ∼7.5 times that of the quartz. The enhanced second-harmonic generation shows a very slow decay at room temperature.

Formation of fresnoite-type Ba2TiGe2O8 crystallites in BaO-TiO2-GeO2 glass thin film and its optical nonlinearity

“…The Raman band observed at 911 cm -1 is attributed to the anti-symmetric stretch of the pyrogermanate groups. 19), 20) The position of Raman bands observed in the crystallized thin film at THT = 730°C also correspond to that of Markgraf's report. In addition, the shoulder peak around 550 cm -1 , weak and broad bands at 844 and 882 cm -1 are also observed in the spectrum.…”

“…It is probably due to increase of the volume fraction of BTG phase in the glass thin film. According to Lu et al,20) effective second-order nonlinear optical constant, deff, in the crystalline thin film is expressed by following formula: (1) where ls is the film thickness, lc,Q is the coherence length of the quartz (~20 μm), n(ω) and n(2ω) are the refractive indices of ω and 2ω, respectively (the subscript of Q and S denotes the values for the quartz and sample, respectively), I is the maximal value of SH intensity, T is transmittance of sample, and d11,Q is the d11 of the quartz (0.55 pm·V -1 ). Figure 6 shows the relation between the value of deff and the heat-treatment temperature, THT.…”

A DFT Study on (001) Thin Slabs of SrTiO3and BaTiO3

“…Moreover, these materials show non-linear optic response that makes them potentially suitable in electro-optical devices. Second harmonic generation has been reported in BaTiO 3 thin lms [4] and recently, the relationship between the structure of BaTiO 3 /SrTiO 3 super lattices and the second-order nonlinear optical susceptibilities were studied [7,8]. Hence the surface structure of ATiO 3 materials is very interesting.…”

Electronic structure and magnetic symmetry in MnTiO3analyzed by second harmonic generation

“…Titanate materials, with chemical formula RTiO 3 (R = Ca, Sr, Ba, Mn), have captured interest for both fundamental and applied study [1][2][3] . These materials usually exhibit one or more ferroic orders.…”