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Raman Imaging of Holographic GratingsInscribed on Polymer Thin Films. F.Lagugne-Labarthet and David Talaga LPCM, UMR 5803 CNRS, Universite Bordeaux 1, 351, Cours de la Liberation, 33405 Talence cedex, France Raman image (Figure 1) from a thin film ofazobenzene-containing polymer thin film (300nm) that is periodically structured (periodicity of~1 um). Raman measurements were recordedwith a Labram HR 800 (HORIBA JobinYvon)spectrometer combinedwith2aninvertedmicroscope (Olympus Ix71) eand|a X,YPiezoelectric stage to position the sample withthe best accuracy and repeatability. A 100X,0.9 NA microscope objective was used. ARaman spectrum (Fig. 2) was recorded every100 nm along the X and Y directions with anintegration time of 5 seconds per spectrum (aexcitation=752.44 nm). The variation of theRaman signal was integrated over the [1060-1180]cm spectral domain (Figure 3). It mustpointed out that details on the Raman profileare obtained with a spatial resolution betterthan A/2 (at the diffraction limit). Figure 2: Raman Spectra of azobenzenepolymer. Acquisition time 5 sec. Raman profile cE Figure 3: Variation of the Raman intensityoverthe Xand Y directions. About the inscription of the two-dimensional grating... Using holographic techniqueswehavestructured the surface in a one step procedure(no wet nor photocuring processing) along theX and Y directions. A grating is first inscribedwith grooves along the X direction, the sampleis rotated by 90° and a second grating isinscribed with grooves along the Y direction.The intensity of the 1st diffracted orders ismonitored to have equal intensities in both Xand Y directions. The atomic force microscopy(AFM) images shown in Fig.3 exhibit a periodicstructure on large surfaces with a heightamplitude varying from 50 to 110 nm. nm/div 7e+002_ Figuree33:: AFMimagesinn 3D) and2Drepresentationsanddp )file ofthe 1heightvariations. :References "Chromophore Orientations upon irradiation ingratings inscribed on azo dye polymer films: acombined AFMand confocal Ramanmicroscopic study", F.Lagugne-Labarthet, J.L.Bruneel, T.Buffeteau, C.Sourisseau, J. Phys.Chem. B., 2004,108, 6949. "Molecular orientations in a nonlinear opticalazopolymer diffraction grating: odd and evenorder parametersffrommnear-fieldsecondharmonic generationandfar-field Ramanmicroscopies", F.Lagugne-Labarthet,C. Sourisseau, R.D. Schaller. R.Saykally,P.Rochon, J.. lPhys.. CChem B,2004,,108.17059. France: HORIBA Jobin Yvon S.A.S., 231 rue de Lille, 59650 Villeneuve d'Ascq. Tel:+33 (0)3 20 59 18 00, ( Fax: + 33 (0)3 20 5918 08. Email :raman@jobinyvon.fr w w w.jobinyvon.fr ) ( UsA: HORIBA Jobin Yvon I n c., 3880 Park Avenue, Edison,NJ 08820-3012. Tel:+1-732-494-8660,Fax:+1-732-549-2571. Email : raman@jobinyvon.com w w w.jobinyvon.com Japan : HORIBA Ltd., JY Optical Sales D e pt., 1-7-8 Higashi-kanda, Chiyoda-ku, T o kyo 101-0031. T el: + 81 (0)3 3861 8231, Fax: +81 (0)3 3861 8259. Email: raman@horiba.com ) ( Germany: +49 (0)6251 84 75-0 I taly: +39 02 57603050 0 U K: +44 (0)20 8204 8142 2/2 ) ORIBAExplore the future China: +All HORIBA Jobin Yvon companies were formerly known as Jobin Yvon)HORIBAExplore the future
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