Actuators Based on Photomechanical Polymer
LaQuieta Huey*, Sergey S. Sarkisov**, Michael J. Curley*,
and Grigory Adamovsky***
*Department of Physics, Alabama Agricultural and Mechanical University, Normal, Alabama 35762, USA
**SSS Optical Technologies, LLC, Huntsville, Alabama 35816, USA
***NASA Glenn Research Center, Cleveland, Ohio 44135, USA
New light-driven actuators based on films of polymer polyvinylidene fluoride are described. The actuators employ the photomechanical bending of the polymer film caused by low power (10mW and less) laser radiation. The photomechanical effect combines various physical mechanisms, such as anisotropic thermal expansion, converse piezoelectric mechanism along with photovoltaic and pyroelectric ones, while the mechanism of thermal expansion is dominant for slow motion. Mechanical vibrations of the strips of the photomechanical polymer were observed with periodic pulsed laser excitation. The resonance frequency is inversely proportional to the square of the length of the strip, in full agreement with the theory. Resonance frequency measurements were used to determine the modulus of elasticity of the films, which was close to 3.0×109Pa. Two possible applications were discussed: photonic switch and adaptive mirror. The proposed actuators have a potential of being used as the components of future light-driven micro/nano systems.
-  J. Dakin and B. Culshaw, “Optical Fiber Sensors. Volume 4: Applications, Analysis, and Future Trends,” pp. 409-435, Artech House, Inc., Boston, MA, 1997.
-  P. De Dobbelaere, K. Falta, and S. Gloeckner, “Advances in integrated 2-D MEMS-based solutions for optical network applications,” IEEE Communications Magazine 41, S16-S23, 2003.
-  S. Inaba, H. Kumazaki, and K. Hane, “Photothermal vibration of fiber core for vibration-type sensor,” Jpn. J. Appl. Phys. 34, pp. 2018-2021, 1995.
-  M. G. Kuzyk, D. W. Garvey, S. R. Vigil, and D. J. Welker, “Alloptical devices in polymer optical fiber,” Chemical Physics 245, pp. 533-544, 1999.
-  Y. Otani, Y. Matsuba, and T. Yoshizawa, “Photothermal actuator composed of optical fibers,” in Optomechatronic Systems II, Hyung Suck Cho (Ed.), Proceedings of SPIE, Vol.4564, pp. 216-219, 2001.
-  H. Finkelman, E. Nishikawa, G. G. Pereira, and M. Warner, “A new opto-mechanical effect in solids,” Phys. Rev. Lett. 87, 015501-1-4, 2001.
-  P. Poosanaas, K. Tonooka, and K. Uchino, “Photostrictive actuators,” Mechatronics 10, pp. 467-487, 2000.
-  P. Krecmer, A. M. Moulin, R. J. Stephenson, T. Rayment, M. E. Welland, and S. R. Elliott, “Reversible nanocontraction and dilation in a solid induced by polarized light,” Science 277, pp. 1799-1802, 1997.
-  Y. Yu, M. Nakano, and T. Ikeda, “Photomechanics: Directed bending of a polymer film by light,” Nature, Vol.425, p. 145, 2003.
-  S. S. Sarkisov, M. J. Curley, L. Huey, A. B. Fields, S. S. Sarkisov II, and G. Adamovsky, “Light-driven actuators based on polymer films,” Optical Engineering 45, 2003.
-  S. S. Sarkisov, M. J. Curley, A. Fields, S. S. Sarkisov II, and G. Adamovsky, “Photomechanical effect in films of polyvinylidene fluoride,” Appl. Phys. Lett. 85, No.14, pp. 2747-2749, 2004.
-  S. Timoshenko, “Vibration problems in engineering,” Wiley, New York, NY, 1974.
-  S. S. Sarkisov, M. J. Curley, G. Adamovsky, S. S. Sarkisov, Jr., and A. Fields, U.S. Patent No. 6999221, February 14, 2006, Bimorphic Polymeric Photomechanical Actuator.
Copyright© 2006 by Fuji Technology Press Ltd. and Japan Society of Mechanical Engineers. All right reserved.