Optical and electro-optic anisotropy of epitaxial Ba0.7Sr0.3TiO3 thin films

Abstract

The anisotropic optical and electro-optic properties of ferroelectric Ba 0.7 Sr 0.3 TiO 3 thin films, deposited on highly transparent single-crystal MgO ͑001͒, ͑011͒, and ͑111͒ substrates using pulsed laser deposition, were investigated. The experimental results show a strong correlation between optical, electro-optic properties, and the orientation of Ba 0.7 Sr 0.3 TiO 3 thin films. The linear electro-optic coefficient r c of the ͑001͒, ͑011͒, and ͑111͒-oriented Ba 0.7 Sr 0.3 TiO 3 thin films are 99.1, 15.7, and 87.8 pm/V, respectively. Such a correlation may be attributed to the orientation dependent distribution and magnitude of spontaneous polarization.

Effects of growth temperature on structure and electrical properties of dielectric (Ba,Sr)TiO3 capacitors with transparent conducting oxide electrodes

“…The mean optical transmittance of STO substrate is around 81% [22]. The transparency of the BST films has been shown a clear drop in the UV region [23]. The absorption edges of the BST thin films are at the wavelength of ∼320 nm, which is close to that in literatures.…”

Optical properties of thin epitaxial Ba0.8Sr0.2TiO3 films

“…For exam ple, refractive index n at wavelength λ = 550 nm varies from 1.79 to 2.35 depending on temperature. When studying the anisotropy of Ba 0.7 Sr 0.3 TiO 3 films by cre ating heterostructures consisting of films with the (001), (011), and (111) orientations on MgO sub strates, it was found [9] that the refractive index varies with the film orientation by only 3% and equals n = 2.45 at λ = 550 nm. This value agrees well with that for the bulk material [10].…”

Epitaxial (Ba,Sr)TiO3 Ferroelectric Thin Films for Integrated Optics

“…Although the E-O properties of bulk ferroelectric materials, such as single crystals of LiNbO 3 and BaTiO 3, and PLZT transparent ceramics, are well identified, the identification of the E-O properties of ferroelectric thin films is not easy since they exhibit processing-dependent properties (Nashimoto et al, 1999) and crystallographic anisotropy (Wang et al, 2010). The E-O properties of the Ba 0.7 Sr 0.3 TiO 3 thin films were measured with a transverse geometry at the wavelength of 632.8 nm using modified Sénarmont method.…”