An optically activated cantilever using photomechanical effects in dye-doped polymer fibers

Details An optically activated cantilever using photomechanical effects in dye-doped polymer fibers An optically activated cantilever using photomechanical effects in dye-doped polymer fibers

2005-07-30

arxiv.org/abs/physics/0508004v2

J. Opt. Soc. Am B, 23, 697 (2006)

Physics

Optics

13 pages, 16 figures

Scientific paper

10.1364/JOSAB.23.000697

We report on what we believe is the first demonstration of an optically activated cantilever due to photomechanical effects in a dye-doped polymer optical fiber. The fiber is observed to bend when light is launched off-axis. The displacement angle monotonically increases as a function of the distance between the illumination point and the fiber axis, and is consistent with differential light-induced length changes. The photothermal and photo-reorientation mechanisms, each with its own distinct response time, are proposed to explain the observed time dependence. The measured degree of bending is consistent with a model that we have proposed which includes coupling between photoisomerization and heating. Most importantly, we have discovered that at high light intensity, a cooperative release of stress results in cis-to-trans isomerization that yields a large and abrupt length change.

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