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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 18 — Sep. 1, 2008
  • pp: 14106–14114
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Two-photon induced polymer nanomovement

Hidekazu Ishitobi, Satoru Shoji, Tsunemi Hiramatsu, Hong-Bo Sun, Zouheir Sekkat, and Satoshi Kawata  »View Author Affiliations


Optics Express, Vol. 16, Issue 18, pp. 14106-14114 (2008)
http://dx.doi.org/10.1364/OE.16.014106


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Abstract

We present the first report of two-photon induced plastic surface deformation in solid polymer films. Exposure of azo polymer films, which absorb in the visible range (λmax=480 nm), to intense 920 nm irradiation leads to polarization dependent photofluidic polymer nanomovement caused by photoselective two-photon trans ↔ cis isomerization. The deformations were induced by a gradient of light intensity; and strongly depend on the wavelength and the polarization direction of the incident laser light and the position of the focused spot with respect to the plane of the polymer film.

© 2008 Optical Society of America

1. Introduction

Polymers containing azobenzene derivatives have been the subject of intensive research for two decades owing to their unique “smartness”, i.e., the ability to tailor and/or control materials properties by photoisomerization [1

1. Z. Sekkat and W. Knoll, ed., Photoreactive Organic Thin Films, (Academic Press, USA, 2002).

]. In particular, it was shown that photoisomerization creates optical anisotropy by nonpolar orientation, and poling by polar optical excitation (all optical poling), and it triggers molecular movement far below the glass transition temperature (Tg) of the polymer (photo-assisted poling), and polymer mass movement proceeds in spatial gradients of the excitation light (surface relief gratings) [2

2. Z. Sekkat and M. Dumont, “Photoassisted Poling of Azo Dye Doped Polymeric Films at Room Temperature,” Appl. Phys. B 54, 486–489 (1992).

5

5. D. Y. Kim, S. K. Tripathy, L. Li, and J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995). [CrossRef]

].

Applications may include optical data storage, birefringent devices, nonlinear optical devices, gratings based devices, and photo-mechanical actuators [6

6. S. Bian, D. Robinson, and M. Kuzyk, “Optically activated cantilever using photomechanical effects in dye-doped polymer fibers,” J. Opt. Soc. Am. B 23, 697–708 (2006).

,7

7. O. M. Tanchak and C. J. Barrett, “Light-induced reversible volume changes in thin films of azo polymers: The photomechanical effect,” Macromolecules 38, 10566–10570 (2005). [CrossRef]

]. In solid polymers, photoisomerization of azobenzene derivatives creates free volume and drives efficient chromophore and polymer segmental and chain motion far below the polymer’s Tg [8

8. Z. Sekkat, J. Wood, E. F. Aust, W. Knoll, W. Volksen, and R. D. Miller, “light-induced orientation in a high glass transition temperature polyimide with polar azo dyes in the side chain,” J. Opt. Soc. Am. B 13, 1713–1724 (1996).

,9

9. Z. Sekkat, P. Prêtre, A. Knoesen, W. Volksen, V. Y. Lee, R. D. Miller, J. Wood, and W. Knoll, “Correlation between polymer architecture and sub-glass-transition-temperature light-induced molecular movement in azo-polyimide polymers: influence on linear and second- and third-order nonlinear optical processes,” J. Opt. Soc. Am. B 15, 401–413 (1998).

]; an effect which is at the origin of photo-assisted and all optical poling and surface relief gratings. Most of the studies reported to date on azo-polymers used single photon isomerization, and it is of critical importance to investigate two- or multiphoton isomerization of azobenzene derivatives in polymers since it would trigger additional studies and applications of azobenzenes containing polymers at the interface of nonlinear optics and photochemistry, in that all of the effects that have been demonstrated in azo-polymers by one-photon isomerization may be reproduced by two- or multi-photon isomerization with potential applications in nanophotonics. The first study towards this end was reported by us few years ago, and we demonstrated the creation of photo-induced anisotropy in photosensitive polymers by two-photon absorption (the nonlinear extension of the Weigert effect), thus showing that photochromic dyes may be isomerized and reoriented in films of polymer by two-photon absorption [10

10. Z. Sekkat, H. Ishitobi, and S. Kawata, “Two-photon isomerization and orientation of photoisomers in thin films of polymer,” Opt. Commun. 222, 269–276 (2003). [CrossRef]

,11

11. Z. Sekkat, “Isomeric orientation by two-photon excitation: a theoretical study,” Opt. Commun. 229, 291–303 (2004). [CrossRef]

]. In this paper, we report on photoinduced plasticity in azo-polymers, i.e., induced surface relief structures, by two-photon isomerization of the azo dye disperse red one (DR1); a chromophore which is well known for its trans ↔ cis photoisomerization and for its ability to undergo efficient photo-orientation; a feature which is due to the highly anisometric nature of its polarizability tensor (rodlike molecule) [12

12. Z. Sekkat, D. Yasumatsu, and S. Kawata, “Pure Photoorientation of azo dye in polyurethanes and quantification of orientation of spectrally overlapping isomers,” J. Phys. Chem. B. 106, 12407–12417 (2002). [CrossRef]

].

Recently, two-photon isomerization and reorientation of azo dyes in polymers have attracted much attention because of the scientific and technological extension into nanophotonics [10

10. Z. Sekkat, H. Ishitobi, and S. Kawata, “Two-photon isomerization and orientation of photoisomers in thin films of polymer,” Opt. Commun. 222, 269–276 (2003). [CrossRef]

,11

11. Z. Sekkat, “Isomeric orientation by two-photon excitation: a theoretical study,” Opt. Commun. 229, 291–303 (2004). [CrossRef]

,13

13. H. Ishitobi, Z. Sekkat, and S. Kawata, “Ordering of azobenzenes by two-photon isomerization,” J. Chem. Phys. 125, 164718 (2006). [CrossRef] [PubMed]

27

27. A. M. Dubrovkin, Y. Jung, V. M. Kozenkov, S. A. Magnitskii, and N. M. Nagorskiy, “Nonlinear induced polarization dependent scattering in solid state azo-dye films,” Laser Phys. Lett. 4, 275–278 (2007). [CrossRef]

]. Basically, the photoreaction can be induced by tightly focused lasers into confined volumes - a resolution of 120 nm has been achieved for three dimensional nanofabrication in photopolymerizable resins [28

28. S. Kawata, H. -B. Sun, T. Tanaka, and K. Takada, “Finer features for functional microdevices - Micromachines can be created with higher resolution using two-photon absorption,” Nature 412, 697–698 (2001). [CrossRef] [PubMed]

] -, and novel scientific information may be obtained, especially with regard to one versus two- or multi-photon reaction pathways — the one and two-photon transition dipole moments of a diarylethene derivative have been found to be perpendicular to each other in two-photon isomerization experiments [10

10. Z. Sekkat, H. Ishitobi, and S. Kawata, “Two-photon isomerization and orientation of photoisomers in thin films of polymer,” Opt. Commun. 222, 269–276 (2003). [CrossRef]

].

Photoinduced surface relief gratings (SRGs) in azo-polymers are of interest because of possible applications in surface micro/nano fabrication, and because the mechanism of the formation of the surface structures, owing to a polarization sensitive isomeric movement that drives a polymer mass movement, is still not understood [4

4. P. Rochon, E. Batalla, and A. Natansohn, “Optically induced surface gratings on azoaromatic polymer films,” Appl. Phys. Lett. 66, 136–138 (1995). [CrossRef]

5

5. D. Y. Kim, S. K. Tripathy, L. Li, and J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995). [CrossRef]

, 29

29. K. Munakata, K. Harada, M. Itoh, S. Umegaki, and T. Yatagai, “A new holographic recording material and its diffraction efficiency increase effect: the use of photoinduced surface deformation in azo-polymer film,” Opt. Commun. 191, 15–19 (2001). [CrossRef]

41

41. F. L. Labarthet, J. L. Bruneel, T. Buffeteau, and C. Sourisseau, “Chromophore Orientations upon Irradiation in Gratings Inscribed on Azo-Dye Polymer Films: A Combined AFM and Confocal Raman Microscopic Study,” J. Phys. Chem. B 108, 6949–6960 (2004).

]. SRGs are usually fabricated by irradiating azo polymer films with interference patterns, while a single focused laser allows for a simple experimental configuration, i.e., simpler than that produced by interference patterns, owing to its gradient of light intensity and polarization thereby allowing for additional information on the mechanism of the formation of such surface relief structures to be obtained [42

42. S. Bian, J. M. Williams, D. Y. Kim, L. Lin, S. Balasubramanian, J. Kumar, and S. Tripathy, “Photoinduced surface deformations on azobenzene polymer films,” J. Appl. Phys. 86, 4498–4508 (1999). [CrossRef]

45

45. H. Ishitobi, M. Tanabe, Z. Sekkat, and S. Kawata, “The anisotropic nanomovement of azo-polymers,” Opt. Express 91, 652–659 (2007). [CrossRef]

]. Indeed, we found in a recent study, that the optical gradient force produced by a single laser beam, which is tightly focused in the air above the film surface, attracts the film towards the beam focus thus making a protrusion just beneath the focus [45

45. H. Ishitobi, M. Tanabe, Z. Sekkat, and S. Kawata, “The anisotropic nanomovement of azo-polymers,” Opt. Express 91, 652–659 (2007). [CrossRef]

]. This phenomenon adds an additional mechanism to the well known observation in which the polymer moves from higher to lower intensity regions along the polarization of the light when the light spot is at the film surface. In all the observations of the induced surface deformation process, trans ↔ cis photoselective isomerization cycling and successive molecular reorientation play a central role [1

1. Z. Sekkat and W. Knoll, ed., Photoreactive Organic Thin Films, (Academic Press, USA, 2002).

].

In this report, we give the first evidence that surface deformation by polymer mass movement may be induced by two-photon isomerization in azo-polymers, and we discuss the effect of the incident light polarization and the position of the laser focus (Z-position of the focus) on the deformation patterns induced by two-photon absorption. We discuss the mechanism of the induced surface deformation for two-photon versus one-photon absorption. The effect of photobleaching is also discussed by studying the effect of the irradiation wavelength, i.e., 780 nm versus 920 nm irradiation, on the induced surface structures.

2. Experiment

We prepared 150 nm thin films of poly(Disperse Red 1 methacrylate) referred to in the text as DR1-PMA (Aldrich, Product No. 579009) (Tg=82 °C) by spin coating from a chloroform solution on a cover glass (~170 µm). In DR1-PMA, the chromophore is flexibly tethered to the main chain. The UV-visible absorption spectrum of the polymer and its structure formula can be found elsewhere [45

45. H. Ishitobi, M. Tanabe, Z. Sekkat, and S. Kawata, “The anisotropic nanomovement of azo-polymers,” Opt. Express 91, 652–659 (2007). [CrossRef]

]. The remaining solvent was removed by heating the films for an hour at 110 °C. The films were irradiated by a linearly polarized near infrared light from a Ti:Sapphire laser (Spectra Physics, Mai Tai, pulse width=130 fs; repetition rate=80 MHz) to induce surface deformations via a two-photon absorption process. The laser light was focused by an objective lens (N.A.=0.55) from the bottom of the cover glass (see a schematic on Fig. 1). The diffraction limited spot diameter in the lateral and longitudinal axes are 2 µm and 12 µm, respectively. A computer controlled piezo stage (Melles Griot, Nanoblock), on which the sample was placed, was used to control the position of the irradiation spot with respect to the sample surface. The surface topology of the deformed films was measured by an atomic force microscope (AFM) (SEIKO Instruments Inc., SPA-400). The AFM was operated in the tapping mode to avoid mechanical deformations of the films by the cantilever itself.

Fig. 1. Schematic of the experimental setup.

3. Results and discussion

Figure 2 shows an AFM image of the surface deformation induced by a focused, linearly polarized, 920 nm irradiation (irradiation intensity=61 kW/cm2; and exposure time=60 s). This figure corresponds to a spot center 2 µm above the film surface in air. A similar behavior is observed when the center of the spot is 1 µm above and just at the film surface. It can be clearly seen from this figure that the polymer moves along the polarization direction from the center to the outside of the focused spot, thus producing two side lobes along the polarization direction and a pit at the center. This can also be seen at the AFM topographic line scans along and perpendicular to the direction of light polarization. This observed behavior, which is due to a photonic effect, i.e., polarization dependent, and not to heat deposition, is much like that observed with single photon isomerization [45

45. H. Ishitobi, M. Tanabe, Z. Sekkat, and S. Kawata, “The anisotropic nanomovement of azo-polymers,” Opt. Express 91, 652–659 (2007). [CrossRef]

]. At half the 920 nm fundamental wavelength, i.e., 460 nm, the sample presents a strong absorption suggesting that two-photon isomerization is at the origin of the surface deformation.

Fig. 2. AFM images of the deformation induced at 920 nm light when Z-position of the focused laser spot is +2 µm. The polarization direction is indicated by the arrow. The line plots (a) parallel and (b) perpendicular to light polarization are shown. The positions of the each plot correspond to the directions that are between the arrows indicated.

The effect of dye photobleaching on the induced surface reliefs was investigated by changing the irradiation wavelength of the laser light to 780 nm to confirm that the surface deformations fabricated by 920 nm irradiation were in fact due to two-photon isomerization and not to bleaching of the dye. Indeed, in a recent report, we showed that DR1 undergoes bleaching under irradiation at 780 nm, at the same range of light intensity, i.e., GW/cm2, via a multi-photon absorption process [14

14. H. Ishitobi, Z. Sekkat, and S. Kawata, “Photo-orientation by multiphoton photoselection,” J. Opt. Soc. Am B 23, 868–873 (2006).

]. Furthermore, Fig. 3 shows that the surface deformation induced by 780 nm irradiation at the same light intensity and exposure time as those of 920 nm irradiation formed dips at the center of focus, and the patterns are independent from the incident light polarization. The same behavior was observed for all Z-positions of the focus. Only those at +2 µm, and at the film surface, i.e., 0 µm, and -1 µm are shown, and no surface deformation was observed when the Z-positions of the spot were smaller than -2 µm. This finding confirms that the surface deformations shown on Fig. 3 were induced by multi-photon bleaching of DR1. Note that while an ablated polymer surface by a high intensity pulsed laser looks rough under AFM imaging, due to the deposition of fragments of the ablated polymer at the film surface [46

46. J. Krüger, S. Martin, H. Mädebach, L. Urech, T. Lippert, A. Wokaun, and W. Kautek, “Femto- and nanosecond laser treatment of doped polymethylmethacrylate,” Appl. Sur. Sci. 247, 406–411 (2005). [CrossRef]

], the AFM images of Fig. 3 are smooth outside the irradiated area and reinforce photobleaching versus ablation as a mechanism of the dip formation.

Fig. 3. (Upper row) AFM images of the surface deformation induced at 780 nm light by changing the Z-position of the focused laser spot. The Z-position was varied from -5 µm to +5 µm with an interval of 1 µm. Only images at +2 µm, 0 µm, and -1 µm are shown. The values inside each figure represent the Z-position of the focus (unit is µm). The polarization direction is indicated by the arrow. (Lower row) Line plot of the surface deformation at Z =+2 µm. The position of the plot corresponds to the directions that are between the arrows indicated.

Fig. 4. AFM images of the surface deformation induced at 920 nm light by changing the Z-position of the focused laser spot. The Z-position was varied from -5 µm to +5 µm with an interval of 1 µm. The values inside each figure represent the Z-position of the focus (unit is µm). The polarization direction is indicated by the arrow.
Fig. 5. (Left column) Line plots of the surface deformations at (a) Z=+2 µm and (b) Z=-2 µm. The positions of the each plot correspond to the directions that are between the arrows indicated in Fig. 4. (Right column) Schematics describing the relationship between the Z-position of the focus and the film surface.

At a low N.A. objective lens, i.e., N.A.=0.55 in the present experiments, the dominant component of electric field at the focus is the one along the polarization direction (Ex) when the incident light is linearly polarized along X. Indeed, electromagnetic calculations that we performed for the intensity distribution at 5 nm below the air (n=1.0)/polymer (n=1.5) interface when the beam focus is at +2 µm and -2 µm (not shown), show that the Y and Z components of the fourth power of the optical field are 7 and 4 orders of magnitude smaller that the fourth power of Ex, respectively (see Fig. 6). So, during two-photon surface relief formation, polymer movement proceeds in direction of the light polarization (X). In this calculation, nonlinear refractive index change induced by two-photon isomerization is not taken into account, because even with one-photon isomerization the maximum refractive index change we measured using the same dye molecules was the order of 10-2. Such a small refractive index change does not affect the field distribution. We also found that the field distribution is nearly unchanged when the Z-position of the focus is at +2 µm (in air) and -2 µm (in the cover glass). Since the field distribution in X-Y plane is quasi-identical from both sides of the polymer film, i.e., the laser is independently focused at the same distance from the film in air and glass, the presence of an intensity gradient along the Z axis leads to the formation of the observed deformation. Note that when the same experiments were performed with one-photon absorption at 460 nm on the same polymer, an optical gradient force [47

47. A. Ashkin, J. M. Dziedzic, J. E. Bjorkholm, and S. Chu, “Observation of a single-beam gradient force optical trap for dielectric particles,” Opt. Lett. 11, 288–290 (1986). [CrossRef] [PubMed]

], which is proportional to the Z-intensity gradient, was observed to be attractive, i.e., a protrusion was formed when the focus was in the air and not in the glass [45

45. H. Ishitobi, M. Tanabe, Z. Sekkat, and S. Kawata, “The anisotropic nanomovement of azo-polymers,” Opt. Express 91, 652–659 (2007). [CrossRef]

]. It is interesting to note that this behavior is opposite to that observed with two-photon isomerization. We do not have yet a clear explanation for this phenomenon, and more experiments are necessary in order to assess how the intensity gradient contributes to the surface relief formation by one and two-photon isomerization. Systematic studies on irradiation wavelength and doses and so on are also needed in order to clarify the mechanism of the formation of the surface relief structures, as well as for assessing the limit of the spatial resolution of two-photon surface nanofabrication on azo-polymers by a single tightly focused laser, especially at a high N.A. objective lens.

Fig. 6. Calculated field distributions of 4th power of electric field components created by a focused linearly polarized laser beam in the presence of the interface between air (n=1.0) and polymer (n=1.5). The distributions were calculated in a XY in-plane which is located at 5 nm below the interface. The figure shows the field distributions when the Z-position of the focus is +2 µm. Each component of the electric fields of (a) Ex, (b) Ey, and (c) Ez are shown. The polarization direction is X, and Z is perpendicular to the film surface, and Y is perpendicular to both X and Z.

4. Conclusion

Both one- and two-photon absorption induce isomerization and surface relief structures in azo-polymers. In this paper, however, we present the first report on two-photon absorption induced surface reliefs. In both one and two-photon cases, the polymer moves in the direction of the irradiation light polarization. We also found that the induced surface pattern strongly depends on the Z-position of the laser focus suggesting the contribution of a light intensity gradient along the Z-axis, i.e., the direction of the propagation of the laser, to the observed surface reliefs. The present findings suggest additional experimental and theoretical studies especially with respect to mechanism of photo-fluidity, in which the assessment of the contribution of the light intensity gradient and radiation forces and torques will be important [48

48. S. Kobatake, S. Takami, H. Muto, T. Ishikawa, and M. Irie, “Rapid and reversible shape changes of molecular crystals on photoirradiation,” Nature 446, 778–781 (2007). [CrossRef] [PubMed]

54

54. W. Singer, T. A. Nieminen, U. J. Gibson, N. R. Heckenberg, and H. Rubinsztein-Dunlop, “Orientation of optically trapped nonspherical birefringent particles,” Phys. Rev. E 73, 021911 (2006).

].

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Z. Sekkat and W. Knoll, ed., Photoreactive Organic Thin Films, (Academic Press, USA, 2002).

2.

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3.

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6.

S. Bian, D. Robinson, and M. Kuzyk, “Optically activated cantilever using photomechanical effects in dye-doped polymer fibers,” J. Opt. Soc. Am. B 23, 697–708 (2006).

7.

O. M. Tanchak and C. J. Barrett, “Light-induced reversible volume changes in thin films of azo polymers: The photomechanical effect,” Macromolecules 38, 10566–10570 (2005). [CrossRef]

8.

Z. Sekkat, J. Wood, E. F. Aust, W. Knoll, W. Volksen, and R. D. Miller, “light-induced orientation in a high glass transition temperature polyimide with polar azo dyes in the side chain,” J. Opt. Soc. Am. B 13, 1713–1724 (1996).

9.

Z. Sekkat, P. Prêtre, A. Knoesen, W. Volksen, V. Y. Lee, R. D. Miller, J. Wood, and W. Knoll, “Correlation between polymer architecture and sub-glass-transition-temperature light-induced molecular movement in azo-polyimide polymers: influence on linear and second- and third-order nonlinear optical processes,” J. Opt. Soc. Am. B 15, 401–413 (1998).

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12.

Z. Sekkat, D. Yasumatsu, and S. Kawata, “Pure Photoorientation of azo dye in polyurethanes and quantification of orientation of spectrally overlapping isomers,” J. Phys. Chem. B. 106, 12407–12417 (2002). [CrossRef]

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28.

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29.

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R. Bachelot, F. H’Dhili, D. Barchiesi, G. Lerondel, R. Fikri, P. Royer, N. Landraud, J. Peretti, F. Chaput, G. Lampel, J-P. Boilot, and K. Lahlil, “Apertureless near-field optical microscopy: A study of the local tip field enhancement using photosensitive azobenzene-containing films,” J. Appl. Phys. 94, 2060–2072 (2003). [CrossRef]

35.

C. Hubert, A. Rumyantseva, G. Lerondel, J. Grand, S. Kostcheev, L. Billot, A. Vial, R. Bachelot, P. Royer, S-H Chang, S. K. Gray, G. P. Wiederrecht, and G. C. Schatz, “Near-Field Photochemical Imaging of Nobel Metal Nanostructures,” Nano Lett. 5, 615–619 (2005). [CrossRef] [PubMed]

36.

Y. Gilbert, R. Bachelot, A. Vial, G. Lerondel, P. Royer, A. Bouhelier, and G. P. Wiederrecht, “Photoresponsive polymers for topographic simulation of the optical near-field of a nanometer sized gold tip in a highly focused laser beam,” Opt. Express 13, 3619–3624 (2005). [CrossRef] [PubMed]

37.

P. Karageorgiev, D. Neher, B. Schulz, B. Stiller, U. Pietsch, M. Giersig, and L. Brehmer, “From anisotropic photo-fluidity towards nanomanipulation in the optical near-field,” Nat. Mater. 4, 699–703 (2005). [CrossRef] [PubMed]

38.

H. Ishitobi, M. Tanabe, Z. Sekkat, and S. Kawata, “Nanomovement of azo polymers induced by metal tip enhanced near-field irradiation,” Appl. Phys. Lett. 91, 091911 (2007). [CrossRef]

39.

T. G. Pedersen, P. M. Johansen, N. C. R. Holme, and P. S. Ramanujam, “Mean-field Theory of Photoinduced Formation of Surface Reliefs in Side-Chain Azobenzene Polymers,” Phys. Rev. Lett. 80, 89–92 (1998). [CrossRef]

40.

P. Lefin, C. Fiorini, and J. M. Nunzi, “Anisotropy of the photoinduced translation diffusion of azo-dyes,” Opt. Mater. 9, 323–328 (1998). [CrossRef]

41.

F. L. Labarthet, J. L. Bruneel, T. Buffeteau, and C. Sourisseau, “Chromophore Orientations upon Irradiation in Gratings Inscribed on Azo-Dye Polymer Films: A Combined AFM and Confocal Raman Microscopic Study,” J. Phys. Chem. B 108, 6949–6960 (2004).

42.

S. Bian, J. M. Williams, D. Y. Kim, L. Lin, S. Balasubramanian, J. Kumar, and S. Tripathy, “Photoinduced surface deformations on azobenzene polymer films,” J. Appl. Phys. 86, 4498–4508 (1999). [CrossRef]

43.

Y. Gilbert, R. Bachelot, P. Royer, A. Bouhelier, G. P. Wiederrecht, and L. Novotny, “Longitudinal anisotropy of the photoinduced molecular migration in azobenzene polymer films,” Opt. Lett. 31, 613–615 (2006). [CrossRef] [PubMed]

44.

T. Grosjean and D Courjon, “Photopolymers as vectorial sensors of the electric field,” Opt. Express 14, 2203–2210 (2006). [CrossRef] [PubMed]

45.

H. Ishitobi, M. Tanabe, Z. Sekkat, and S. Kawata, “The anisotropic nanomovement of azo-polymers,” Opt. Express 91, 652–659 (2007). [CrossRef]

46.

J. Krüger, S. Martin, H. Mädebach, L. Urech, T. Lippert, A. Wokaun, and W. Kautek, “Femto- and nanosecond laser treatment of doped polymethylmethacrylate,” Appl. Sur. Sci. 247, 406–411 (2005). [CrossRef]

47.

A. Ashkin, J. M. Dziedzic, J. E. Bjorkholm, and S. Chu, “Observation of a single-beam gradient force optical trap for dielectric particles,” Opt. Lett. 11, 288–290 (1986). [CrossRef] [PubMed]

48.

S. Kobatake, S. Takami, H. Muto, T. Ishikawa, and M. Irie, “Rapid and reversible shape changes of molecular crystals on photoirradiation,” Nature 446, 778–781 (2007). [CrossRef] [PubMed]

49.

H. Hisakuni and K. Tanaka, “Optical microfabrication of chalcogenide glasses,” Science 270, 974–975 (1995). [CrossRef]

50.

S. Juodkazis, N. Mukai, R. Wakaki, A. Yamaguchi, S. Matsuo, and H. Misawa, “Reversible phase transitions in polymer gels induced by radiation forces,” Nature 408, 178–181 (2000). [CrossRef] [PubMed]

51.

M. E. J. Friese, T. A. Nieminen, N. R. Heckenberg, and H. Rubinsztein-Dunlop, “Optical alignment and spinning of laser-trapped microscopic particles,” Nature 394, 348–350 (1998). [CrossRef]

52.

A. La Porta and M. D. Wang, “Optical torque wrench: Angular trapping, rotation, and torque detection of quartz microparticles,” Phys. Rev. Lett. 92, 190801 (2004). [CrossRef] [PubMed]

53.

M. Liu, N. Ji, Z. Lin, and S. T. Chui, “Radiation torque on a birefringent sphere caused by an electromagnetic wave,” Phys. Rev. E 72, 056610 (2005).

54.

W. Singer, T. A. Nieminen, U. J. Gibson, N. R. Heckenberg, and H. Rubinsztein-Dunlop, “Orientation of optically trapped nonspherical birefringent particles,” Phys. Rev. E 73, 021911 (2006).

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(160.5335) Materials : Photosensitive materials

ToC Category:
Atomic and Molecular Physics

History
Original Manuscript: June 2, 2008
Revised Manuscript: August 1, 2008
Manuscript Accepted: August 5, 2008
Published: August 26, 2008

Citation
Hidekazu Ishitobi, Satoru Shoji, Tsunemi Hiramatsu, Hong-Bo Sun, Zouheir Sekkat, and Satoshi Kawata, "Two-photon induced polymer nanomovement," Opt. Express 16, 14106-14114 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-18-14106


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  36. Y. Gilbert, R. Bachelot, A. Vial, G. Lerondel, P. Royer, A. Bouhelier, and G. P. Wiederrecht, "Photoresponsive polymers for topographic simulation of the optical near-field of a nanometer sized gold tip in a highly focused laser beam," Opt. Express 13, 3619-3624 (2005). [CrossRef] [PubMed]
  37. P. Karageorgiev, D. Neher, B. Schulz, B. Stiller, U. Pietsch, M. Giersig, and L. Brehmer, "From anisotropic photo-fluidity towards nanomanipulation in the optical near-field," Nat. Mater. 4, 699-703 (2005). [CrossRef] [PubMed]
  38. H. Ishitobi, M. Tanabe, Z. Sekkat, and S. Kawata, "Nanomovement of azo polymers induced by metal tip enhanced near-field irradiation," Appl. Phys. Lett. 91, 091911 (2007). [CrossRef]
  39. T. G. Pedersen, P. M. Johansen, N. C. R. Holme, and P. S. Ramanujam, "Mean-field Theory of Photoinduced Formation of Surface Reliefs in Side-Chain Azobenzene Polymers," Phys. Rev. Lett. 80, 89-92 (1998). [CrossRef]
  40. P. Lefin, C. Fiorini, J. M. Nunzi, "Anisotropy of the photoinduced translation diffusion of azo-dyes," Opt. Mater. 9, 323-328 (1998). [CrossRef]
  41. F. L. Labarthet, J. L. Bruneel, T. Buffeteau, and C. Sourisseau, "Chromophore Orientations upon Irradiation in Gratings Inscribed on Azo-Dye Polymer Films: A Combined AFM and Confocal Raman Microscopic Study," J. Phys. Chem. B 108, 6949-6960 (2004).
  42. S. Bian, J. M. Williams, D. Y. Kim, L. Lin, S. Balasubramanian, J. Kumar and S. Tripathy, "Photoinduced surface deformations on azobenzene polymer films," J. Appl. Phys. 86, 4498-4508 (1999). [CrossRef]
  43. Y. Gilbert, R. Bachelot, P. Royer, A. Bouhelier, G. P. Wiederrecht, and L. Novotny, "Longitudinal anisotropy of the photoinduced molecular migration in azobenzene polymer films," Opt. Lett. 31, 613-615 (2006). [CrossRef] [PubMed]
  44. T. Grosjean and D Courjon, "Photopolymers as vectorial sensors of the electric field," Opt. Express 14, 2203-2210 (2006). [CrossRef] [PubMed]
  45. H. Ishitobi, M. Tanabe, Z. Sekkat, and S. Kawata, "The anisotropic nanomovement of azo-polymers," Opt. Express 91, 652-659 (2007). [CrossRef]
  46. J. Krüger, S. Martin, H. Mädebach, L. Urech, T. Lippert, A. Wokaun, and W. Kautek, "Femto- and nanosecond laser treatment of doped polymethylmethacrylate," Appl. Sur. Sci. 247, 406-411 (2005). [CrossRef]
  47. A. Ashkin, J. M. Dziedzic, J. E. Bjorkholm, and S. Chu, "Observation of a single-beam gradient force optical trap for dielectric particles," Opt. Lett. 11, 288-290 (1986). [CrossRef] [PubMed]
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  51. M. E. J. Friese, T. A. Nieminen, N. R. Heckenberg, and H. Rubinsztein-Dunlop, "Optical alignment and spinning of laser-trapped microscopic particles," Nature 394, 348-350 (1998). [CrossRef]
  52. A. La Porta and M. D. Wang, "Optical torque wrench: Angular trapping, rotation, and torque detection of quartz microparticles," Phys. Rev. Lett. 92, 190801 (2004). [CrossRef] [PubMed]
  53. M. Liu, N. Ji, Z. Lin, and S. T. Chui, "Radiation torque on a birefringent sphere caused by an electromagnetic wave," Phys. Rev. E 72, 056610 (2005).
  54. W. Singer, T. A. Nieminen, U. J. Gibson, N. R. Heckenberg, and H. Rubinsztein-Dunlop, "Orientation of optically trapped nonspherical birefringent particles," Phys. Rev. E 73, 021911 (2006).

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