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A Unified Material Description for Light Induced Deformation in Azobenzene Polymers.

Bin J, Oates WS - Sci Rep (2015)

Bottom Line: It is shown that dipole forces strongly respond to polarized light in contrast to higher order quadrupole forces that are often used to describe surface relief grating deformation through a field gradient constitutive law.The modeling results and comparisons with a broad range of photomechanical data in the literature suggest that the molecular structure of the azobenzene monomers dramatically influences the photostrictive behavior.The results provide important insight for designing azobenzene monomers within a polymer network to achieve enhanced photo-responsive deformation.

View Article: PubMed Central - PubMed

Affiliation: Florida Center for Advanced Aero Propulsion (FCAAP), Department of Mechanical Engineering, Florida State University. Tallahassee, FL, 32310, USA.

ABSTRACT
Complex light-matter interactions in azobenzene polymers have limited our understanding of how photoisomerization induces deformation as a function of the underlying polymer network and form of the light excitation. A unified modeling framework is formulated to advance the understanding of surface deformation and bulk deformation of polymer films that are controlled by linear or circularly polarized light or vortex beams. It is shown that dipole forces strongly respond to polarized light in contrast to higher order quadrupole forces that are often used to describe surface relief grating deformation through a field gradient constitutive law. The modeling results and comparisons with a broad range of photomechanical data in the literature suggest that the molecular structure of the azobenzene monomers dramatically influences the photostrictive behavior. The results provide important insight for designing azobenzene monomers within a polymer network to achieve enhanced photo-responsive deformation.

No MeSH data available.


Related in: MedlinePlus

The dependence of surface relief upon the topological charge, ξ.
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f8: The dependence of surface relief upon the topological charge, ξ.

Mentions: Figure 8 represents the surface relief patterns induced by a linearly polarized vortex beam with the different topological charge. This figure reveals that the numerical results are qualitatively in good agreement with experiments15. In the case of ξ = 0, two lobes along the x direction occur as observed in a linearly polarized Gaussian beam case. As ξ increases, these lobes rotate in the clockwise direction and the spiral structure having two-arms are produced for a high ξ. Experiments given in the literature indicate that the spiral surface relief structures induced by the vortex beam are strongly influenced by the vortex topological charge and the wavefront handedness. Here, we illustrate that this behavior is strongly dependent on the microstructure of azobenzene within the polymer network as it responds to the spatial optical intensity distribution of the light as well as its phase and handedness.


A Unified Material Description for Light Induced Deformation in Azobenzene Polymers.

Bin J, Oates WS - Sci Rep (2015)

The dependence of surface relief upon the topological charge, ξ.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4594130&req=5

f8: The dependence of surface relief upon the topological charge, ξ.
Mentions: Figure 8 represents the surface relief patterns induced by a linearly polarized vortex beam with the different topological charge. This figure reveals that the numerical results are qualitatively in good agreement with experiments15. In the case of ξ = 0, two lobes along the x direction occur as observed in a linearly polarized Gaussian beam case. As ξ increases, these lobes rotate in the clockwise direction and the spiral structure having two-arms are produced for a high ξ. Experiments given in the literature indicate that the spiral surface relief structures induced by the vortex beam are strongly influenced by the vortex topological charge and the wavefront handedness. Here, we illustrate that this behavior is strongly dependent on the microstructure of azobenzene within the polymer network as it responds to the spatial optical intensity distribution of the light as well as its phase and handedness.

Bottom Line: It is shown that dipole forces strongly respond to polarized light in contrast to higher order quadrupole forces that are often used to describe surface relief grating deformation through a field gradient constitutive law.The modeling results and comparisons with a broad range of photomechanical data in the literature suggest that the molecular structure of the azobenzene monomers dramatically influences the photostrictive behavior.The results provide important insight for designing azobenzene monomers within a polymer network to achieve enhanced photo-responsive deformation.

View Article: PubMed Central - PubMed

Affiliation: Florida Center for Advanced Aero Propulsion (FCAAP), Department of Mechanical Engineering, Florida State University. Tallahassee, FL, 32310, USA.

ABSTRACT
Complex light-matter interactions in azobenzene polymers have limited our understanding of how photoisomerization induces deformation as a function of the underlying polymer network and form of the light excitation. A unified modeling framework is formulated to advance the understanding of surface deformation and bulk deformation of polymer films that are controlled by linear or circularly polarized light or vortex beams. It is shown that dipole forces strongly respond to polarized light in contrast to higher order quadrupole forces that are often used to describe surface relief grating deformation through a field gradient constitutive law. The modeling results and comparisons with a broad range of photomechanical data in the literature suggest that the molecular structure of the azobenzene monomers dramatically influences the photostrictive behavior. The results provide important insight for designing azobenzene monomers within a polymer network to achieve enhanced photo-responsive deformation.

No MeSH data available.


Related in: MedlinePlus