Thermo-optic properties of epitaxial Sr_06Ba_04Nb_2O_6 waveguides and their application as optical modulator

Abstract

A prism-coupler technique was introduced to determine the refractive indices and thermo-optic coefficients of epitaxial Sr 0.6 Ba 0.4 Nb 2 O 6 (SBN) waveguides, in a temperature range covering the ferroelectricparaelectric phase transition. A strong enhancement in the TO coefficient is observed near T c . This strong enhancement is related to the critical change of the polarization. The values of / e dn dT are significantly larger than / o dn dT due to the larger quadratic electro-optic coefficient in TM polarization. In TM mode, the refractive index of SBN is increased by 1.3% as the temperature is increased to 160°C. Our results suggest that SBN waveguide is a potential candidate for thermo-optic modulators and switches. 191(1-4), 181-187 (2002). 20. R. Ulrich, and R. Torge, "Measurement of thin-film parameters with a prism coupler," Appl. Opt. 12(12), 2901-2908 (1973). 21. G. Burns, and F. H. Dacol, "Crystalline ferroelectrics with glassy polarization behavior," Phys. Rev. B 28(5), 2527-2530 (1983

Thermooptic properties of epitaxial BiFeO3films with different orientations

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Inelastic light scattering studies of diffuse phase transition in ferroelectric Sr1.9Ca0.1NaNb5O15 thin films

“…Details of the measurements were reported elsewhere. [19] The temperature dependence of the ordinary refractive index (n o ) of the SCNN film measured by the prism coupler technique is linear above T B (Fig. 5).…”

Engineering of thermo-optic properties in ion implanted lithium niobate waveguides by electronic stopping power

“…The TO coefficients of the waveguide are measured by the prism coupling method that has been successfully used in a few crystalline [30] and polymer planar waveguides [31]. Figure 1 shows the schematic plot of the experimental setup.…”