Electro‐optic modulation and self‐poling in strain‐induced waveguides in barium strontium titanate niobate
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Characterization of bulk single crystals and optical waveguides in Ba1-xSrxTiyNb2-yO6(BSTN) indicate it to be a promising new ferroelectric material for electrooptic devices. The electro-optic coefficient r33is measured to be 218±12 pm/V, a factor of 7 greater than LiNbO3. Data on refractive indices, dielectric constant, and Curie temperature Tcin bulk samples are also presented. Strain-induced waveguides in Z-cut samples exhibited low losses (1.8 dB/cm for TM polarization and 2.5 dB/cm for TE polarization) at a wavelength of 1.3 μm. Electro-optic modulation was demonstrated in these waveguides to frequencies >100 MHz. A "self-poling" effect was found, whereby strong electro-optic modulation is observed in the strain waveguides without repoling the crystal after processing at temperatures far above Tc.© 1995 American Institute of Physics.
author list (cited authors)
Marx, J. M., Eknoyan, O., Taylor, H. F., Tang, Z., & Neurgaonkar, R. R.