Monitoring of ultraviolet pulse rate dependent photomechanical actuation in carbon nanotubes using fiber Bragg gratings

In this Letter, we present a non-contact method of controlling and monitoring photomechanical actuation in carbon nanotubes (CNT) by exposing it to ultra-violet radiation at different pulse rates (10 to 200 Hz). This is accomplished by imparting a reversible photo induced strain (5–330 με) on CNT co...

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Bibliographic Details
Published in:Applied physics letters 2014-01, Vol.104 (1)
Main Authors: Shivananju, B. N., Suri, Ashish, Asokan, S., Misra, Abha
Format: Article
Language:English
Subjects:
Actuation
Applied physics
Bragg gratings
BRAGG REFLECTION
CARBON NANOTUBES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Coated fibers
GRATINGS
Monitoring
NANOSCIENCE AND NANOTECHNOLOGY
Photon absorption
PHOTONS
Pulse rate
Strain
ULTRAVIOLET RADIATION
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Summary:In this Letter, we present a non-contact method of controlling and monitoring photomechanical actuation in carbon nanotubes (CNT) by exposing it to ultra-violet radiation at different pulse rates (10 to 200 Hz). This is accomplished by imparting a reversible photo induced strain (5–330 με) on CNT coated fibre Bragg gratings; CNT undergoes an internal reversible structural change due to cyclic photon absorption that leads to the development of mechanical strain, which in turn allows reversible switching of the Bragg wavelength. The results also reveal an interesting pulse rate dependent rise and fall times of photomechanical actuation in CNT.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4860965