Polymers 04
Raman Imaging of Holographic Gratings
Inscribed on Polymer Thin Films.
F.Lagugné-Labarthet and David Talaga
LPCM, UMR 5803 CNRS, Université Bordeaux 1, 351, Cours de la Libération, 33405 Talence cedex, France
Raman image (Figure 1) from a thin film of
azobenzene-containing polymer thin film (300
nm) that is periodically structured (periodicity of
~1 µm). Raman measurements were recorded
with a Labram HR 800 (HORIBA JobinYvon)
spectrometer combined with an inverted
microscope (Olympus IX 71) and a X,Y
Piezoelectric stage to position the sample with
the best accuracy and repeatability. A 100X,
0.9 NA microscope objective was used. A
Raman spectrum (Fig. 2) was recorded every
100 nm along the X and Y directions with an
integration time of 5 seconds per spectrum (λ
excitation=752.4 nm). The variation of the
Raman signal was integrated over the [10601180]cm-1 spectral domain (Figure 3). It must
pointed out that details on the Raman profile
are obtained with a spatial resolution better
than λ/2 (at the diffraction limit).
Figure 2: Raman Spectra of azobenzene
polymer. Acquisition time 5 sec.
Figure 3: Variation of the Raman intensity over
the X and Y directions.
Figure 1
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Polymers 04
About the inscription of the twodimensional grating…
Using holographic techniques we have
structured the surface in a one step procedure
(no wet nor photocuring processing ) along the
X and Y directions. A grating is first inscribed
with grooves along the X direction, the sample
is rotated by 90° and a second grating is
inscribed with grooves along the Y direction.
The intensity of the 1st diffracted orders is
monitored to have equal intensities in both X
and Y directions. The atomic force microscopy
(AFM) images shown in Fig.3 exhibit a periodic
structure on large surfaces with a height
amplitude varying from 50 to 110 nm.
Figure 3: AFM images in 3D and 2D
representations and profile of the height
variations.
References
"Chromophore Orientations upon irradiation in
gratings inscribed on azo dye polymer films: a
combined AFM and confocal Raman
microscopic study", F.Lagugné-Labarthet, J.L.
Bruneel, T.Buffeteau, C.Sourisseau, J. Phys.
Chem. B., 2004, 108, 6949.
"Molecular orientations in a nonlinear optical
azopolymer diffraction grating: odd and even
order parameters from near-field second
harmonic generation and far-field Raman
microscopies”,
F.Lagugné-Labarthet,
C.Sourisseau, R.D. Schaller, R.Saykally,
P.Rochon, J. Phys. Chem B, 2004, 108,
17059.
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