Analysis of the Key Elements on the 2-D Electro-optic Modulation of BaTiO3 Crystal Thin-film Waveguide

DOI

10.2991/smont-19.2019.24How to use a DOI?

Keywords

barium titanate; coefficient; birefringence; refractive index variation; electro-optical modulation; embedded

Abstract

As ferroelectric crystal, barium titanate (BTO) crystal with an ultra-high electro-optical (EO) coefficient and a special modulation mechanism has become the most popular research object to realize the ultra-high bandwidth EO modulator (over 100GHz). In this paper, we model/simulate the conditions of two different kinds of EO modulation for the a- and c-axis grown BTO crystal thin-films through a new embedded waveguide-electrode structure. As a result, the mutual influences between the microwave electric-field and the light field in determining the optimal interaction overlap integral are found to determine the highest modulation efficienc. Meanwhile, we also see the influence of the BTO birefringence on the modulation efficiencies of the two different orientations of BTO crystal films. Under the optimized conditions, the device designs have the better performance and the more accurate electro-optical coefficient. It can be seen from the simulated data in this paper that under the quasi-linear electro-optical modulation of a-axis, when the optical axis and waveguide transmission direction are at a 45-degree angle, the EO interaction effect of the new embedded waveguide electrode structure is realized, and then the highest EO modulation is reached, which is about 1.47V·mm. In contrast, under the nonlinear modulation of c-axis, where a perpendicular electric field to the axis of BTO crystal is applied and then it reaches the lowest V-L performance of 4.38V2·mm.

Copyright

© 2019, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Mengxi Luo
AU  - Degui Sun
AU  - Na Sun
PY  - 2019/04
DA  - 2019/04
TI  - Analysis of the Key Elements on the 2-D Electro-optic Modulation of BaTiO3 Crystal Thin-film Waveguide
BT  - Proceedings of the 2019 International Conference on Modeling, Simulation, Optimization and Numerical Techniques (SMONT 2019)
PB  - Atlantis Press
SP  - 98
EP  - 102
SN  - 1951-6851
UR  - https://doi.org/10.2991/smont-19.2019.24
DO  - 10.2991/smont-19.2019.24
ID  - Luo2019/04
ER  -