Abstract

In conventional optical waveguide devices, an elec-tro-optic (EO) active layer must be sandwiched between two layers that have low refractive-index with a similar EO active layer thickness. Our structure is composed of the same layers as an EO polymer/TiO₂ multilayer slot waveguide modulator [1] in order to measure an EO coefficient by Teng and Man technique. In standard structure, the EO polymer film is sandwiched between two electrodes and a voltage is applied between the electrodes to produce an electric field in the EO polymer films. As it is essential to have a higher voltage drop across the EO polymer layer, a barrier layers or a cladding layer that surrounds the polymer should have much higher conductivity than the EO polymer [2]. In order to achieve higher EO coefficient, and the role of interfaces between polymers, metal oxides and metals may be predominant.

© 2014 Japan Society of Applied Physics, Optical Society of America