Abstract
Flexible electronic and photonic devices are important for future application of flexible displays and general lighting, such as, organic and polymeric light emitting devices and solar cells. Polyethylene terephthalate (PET) films are generally used as substrate for giving flexibility to device. But these substrate are birefringent in nature which will make the problem in the displays fabricated on them. In this paper we report the measurement of the birefringence by using interferometry and Hilbert transform fringe analysis technique. Increase in the refractive index was observed with increasing external bending applied to PET substrate for dual wavelengths, i.e., green and red lasers.
