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All-Optical Micro Motors Based on Moving Gratings in Photosensitive MediaAn all-optical micromotor with a rotor driven by a traveling wave of surface deformation of a stator being in contact with the rotor is being studied. Instead of an ultrasonic wave produced by an electrically driven piezoelectric actuator as in ultrasonic motors, the wave is a result of a photo-induced surface deformation of a photosensitive material produced by an incident radiation. A thin piezoelectric polymer will deform more easily LiNbO3 or metal when irradiated with light. The type of photosensitive material studied are piezoelectric polymers with and without coatings for connecting electrodes. In order to be considered as a possible candidate for micromotors, the material should exhibit surface deformation produced by a laser beam of the order of 10 microns. This is compared to the deformations produced by static holographic gratings studied in photorefractive crystals of LiNbO3 using high vertical resolution surface profilometer Dektak 3 and surface interferometer WYKO. An experimental setup showing the oscillations has been developed. The setup uses a chopped beam from an Argon ion laser to produce the deformation while a probe beam is reflected by the thin film into a fiber which is then detected on an oscilloscope. A ramp voltage signal generator will drive the piezoelectric film in another experiment to determine the resonance of the film. A current is generated when light is incident upon the film and this current can be measured. The reverse process has already been demonstrated in other piezoelectric actuators. Changing voltage, polarity, and frequency of the signal can easily generate vibrations similar to those when light is incident on the film. This can be compared to the effects of laser interaction with light absorbing fluids such as solutions of 2,9,16,23-Tetrakis(phenylthio)-29H, 31 H-phthalocyanine in chlorobenzene in capillary tubes, The possibility of using a liquid with the piezoelectric film would be a novel idea for a micromotor since the interaction of a single low power focused laser beam at 633 nm with such fluid produced an intensive circular motion.
Document ID
20020018885
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Curley, M.
(Alabama A & M Univ. Normal, AL United States)
Sarkisov, S. S.
(Alabama A & M Univ. Normal, AL United States)
Fields, A.
(Alabama A & M Univ. Normal, AL United States)
Smith, C.
(Alabama A & M Univ. Normal, AL United States)
Kukhtarev, N.
(Alabama A & M Univ. Normal, AL United States)
Kulishov, M. B.
(Alabama A & M Univ. Normal, AL United States)
Adamovsky, Grigory
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
August 20, 2013
Publication Date
November 1, 2001
Publication Information
Publication: HBCUs/OMUs Research Conference Agenda and Abstracts
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
P5
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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