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Guided-wave electro-optic characterization of BaTiO3 thin films using the prism coupling technique
Floriane Leroy1, Anthony Rousseau, Sandrine Payan
1Institut Electronique Microélectronique et Nanotechnologies, UMR CNRS 8520, Villeneuve d'Ascq, France.
Optics Letters
|April 3, 2013
Summary
Barium titanate (BaTiO3) thin films exhibit excellent optical properties and electro-optic (EO) effects. These findings highlight their potential for advanced photonic applications like modulators and switches.
Area of Science:
- Materials Science
- Optoelectronics
- Solid State Physics
Background:
- Ferroelectric Barium Titanate (BTO) thin films are crucial for optoelectronic devices.
- Understanding their optical and electro-optic (EO) properties is key for device optimization.
Purpose of the Study:
- To characterize the optical properties of BTO thin films grown by RF sputtering.
- To investigate the electro-optic (EO) performance of these films for potential applications.
Main Methods:
- Fabrication of BTO thin films on indium tin oxide/MgO substrates using RF sputtering.
- Optical property analysis via prism coupling technique to determine refractive indices and optical losses.
- Electro-optic (EO) property evaluation by measuring resonant coupling angle shifts under an applied electric field.
Main Results:
- Determined ordinary (n0=2.224±0.001) and extraordinary (ne=2.219±0.001) refractive indices at 1539 nm.
- Measured optical losses on planar waveguides.
- Obtained EO coefficients of ~18 pm/V (TE mode) and ~23 pm/V (TM mode) at 1539 nm.
Conclusions:
- Polycrystalline BTO thin films possess suitable optical and EO properties.
- The demonstrated EO effect indicates potential for BTO in modulators, switches, and interconnections.
