Low-voltage, polarization-insensitive, electro-optic modulator based on a polydomain barium titanate thin film

Pingsheng Tang; Towner, D.J.; Meier, A.L.; Wessels, B.W.
November 2004
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4615
Academic Journal
A BaTiO3 thin-film electro-optic waveguide modulator with a half-wave voltage-interaction length product (VπL) of 1.1 V cm at 1 .55-µm wavelength is demonstrated. The half-wave voltage and the measured effective electro-optic coefficient are 3.3 V and 162 pm/V, respectively. The half-wave voltage increases less than 10% over a temperature range of 23-90 °C. Polarization-independent electro-optic modulation was observed and attributed to the polydomain structure of the BaTiO3 film. The unique combination of large electro-optic coefficient and polarization independence illustrates how engineered domain structures in ferroelectric thin films can enable properties and performance unachievable in bulk single crystals.


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