Abstract
Indium tin oxide (ITO) coated polyethylene terephthalate (PET)
is widely used as the substrate for the flexible electronics and photonic
devices and displays. These PET substrates are found to be birefringent due to the residual stress
induced during manufacturing process, which may change the optical
properties of display devices. In this paper, we report the measurement
of the residual and induced birefringence as a function of the bending
applied to the PET substrates for red, green, and blue (RGB) wavelengths
of laser light. We have used the basic photo elasticity set-up for
recording the interference fringes using CCD camera. The recorded
interferograms were analyzed from the line profile calculated by the
MATLAB program. We found that the change in birefringence for ITO/PET
substrate follow the Cauchy's law of dispersion for the different
applied curvature, for the RGB wavelengths.
© 2015 IEEE
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