Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30949
Title: Sr1.8Ca0.2NaNb5O15 films for electro-optic modulator application
Authors: Liu, WC
Mak, CL 
Wong, KH
Issue Date: 2009
Publisher: Institute of Physics Publishing
Source: Journal of physics. D, Applied physics, 2009, v. 42, no. 10, 105114 How to cite?
Journal: Journal of physics. D, Applied physics 
Abstract: Ferroelectric Sr1.8Ca0.2NaNb5O 15 (SCNN) optical thin films have been fabricated on fused quartz substrates using pulsed laser deposition. X-ray diffraction measurements and scanning electron microscopy revealed that these SCNN thin films exhibited a pure tetragonal tungsten-bronze phase polycrystalline crystal structure with good surface morphologies. Their transmittance profiles showed that the films had a transmittance of 80% in the visible range. The optical waveguiding properties of the films were characterized using a coupled prism technique. Distinct m-lines of the guided transverse-electric (TE) and -magnetic (TM) modes of the SCNN waveguides were observed. The TE and TM refractive indices were found to be 2.251 and 2.237, respectively. A simple, direct and reliable technique based on the shift of synchronous angles of the guided modes as a function of the applied electric field was used to investigate the effective electro-optic coefficient, which was determined to be 176.6 pm V-1. We demonstrate that this technique is convenient in studying the effective electro-optics properties for thin films.
URI: http://hdl.handle.net/10397/30949
ISSN: 0022-3727
EISSN: 1361-6463
DOI: 10.1088/0022-3727/42/10/105114
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