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Similarly, an enhanced electrooptic coefficient was ob-
served for polymer films that contained both the dye and
gold particles. The observed enhancement of optical properties
offers opportunities to implement methodologies for chemi-
cal analysis and sensors. There is considerable interest in
composites containing metal nanoparticles for chemical
analysis (58), sensing (59), and nanoscale electronics (60).
Local field enhancement of the NLO response of a chromo-
phore will be advantageous for the construction of devices
with combined functionality. For example, metallic particles
can be grafted on waveguides for an evanescent wave to
probe spectroscopically species and chemical processes at
the surface (34).
Supplemental material available
Hill plot obtained from HRS measurements.4
Acknowledgements
This work was supported by the Collaborative Research
Program of the Natural Sciences and Engineering Research
Council of Canada (NSERC). We thank Ms. K. Saravanamuttu
for her assistance in acquiring the Raman spectra.
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Langmuir. 17, 578 (2001).
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4 Supplementary data may be purchased from the Depository of Unpublished Data, Document Delivery, CISTI, National Research Council
© 2002 NRC Canada