Open AccessOptical properties of epitaxial Ca_xBa_1-xNb_2O_6 thin film based rib-waveguide structure on (001) MgO for electro-optic applications
Author(s) -
Sébastien Vigne,
Nadir Hossain,
Faezeh Fesharaki,
Shaila Kabir,
J. Margot,
Ke Wu,
Mohamed Chaker
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.028573
Subject(s) - materials science , refractive index , thin film , optics , waveguide , epitaxy , prism , etching (microfabrication) , optoelectronics , laser , wavelength , pulsed laser deposition , planar , layer (electronics) , composite material , physics , computer graphics (images) , computer science , nanotechnology
In this work, optical properties of epitaxial Ca x Ba 1-x Nb 2 O 6 , CBN (x = 0.28) thin film based waveguides are studied at 1550 nm optical communications wavelength. CBN thin films are deposited epitaxially on MgO substrates using Pulsed Laser Deposition and characterized by prism coupling to extract the refractive index and propagation loss. It is shown that the 2 µm-thick epitaxial CBN thin films have a refractive index close to the bulk form and the CBN planar waveguides have a propagation loss of 4.3 ± 0.5 dB/cm. 1 cm-long rib waveguide structures were fabricated using a high density plasma etching. Their propagation losses were measured by the cutback method at 8.4 ± 0.6 dB/cm.