Imperial College London

ProfessorNeilAlford

Central FacultyOffice of the Provost

Associate Provost (Academic Planning)
 
 
 
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Contact

 

+44 (0)20 7594 6724n.alford

 
 
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Assistant

 

Miss Catherine Graham +44 (0)20 7594 3330

 
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Location

 

2..05 (in RSM) or 3.09 (in the Faculty Building)Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Lei:2012:10.1364/OE.20.004419,
author = {Lei, DY and Kéna-Cohen, S and Zou, B and Petrov, PK and Sonnefraud, Y and Breeze, J and Maier, SA and Alford, NM},
doi = {10.1364/OE.20.004419},
journal = {Opt. Express},
pages = {4419--4427},
title = {Spectroscopic ellipsometry as an optical probe of strain evolution in ferroelectric thin films},
url = {http://dx.doi.org/10.1364/OE.20.004419},
volume = {20},
year = {2012}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Heteroepitaxial strain in ferroelectric thin films is known to have a significant impact on both their low and high frequency dielectric properties. In this paper, we use ex-situ spectroscopic ellipsometry to study the strain evolution with film thickness, and strain relaxation in ferroelectric Ba0.5Sr0.5TiO3 epitaxial films grown on single crystal substrates. For films grown on MgO substrates, a critical thickness for strain relaxation is observed. In addition, studies of Ba0.5Sr0.5TiO3 films grown on different single crystal substrates reveal that the strain relaxation rate can be inferred from changes in the optical properties. Using this information, we show that the optical constants of Ba0.5Sr0.5TiO3 can be readily tuned via strain engineering.
AU - Lei,DY
AU - Kéna-Cohen,S
AU - Zou,B
AU - Petrov,PK
AU - Sonnefraud,Y
AU - Breeze,J
AU - Maier,SA
AU - Alford,NM
DO - 10.1364/OE.20.004419
EP - 4427
PY - 2012///
SP - 4419
TI - Spectroscopic ellipsometry as an optical probe of strain evolution in ferroelectric thin films
T2 - Opt. Express
UR - http://dx.doi.org/10.1364/OE.20.004419
VL - 20
ER -