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A graphene-based biopolymer is developed which exhibits saturable absorption and optical limiting behavior in the femtosecond and nanosecond regime respectively. Further this composite film when irradiated with nanosecond pulses indicates a damage threshold >50 J/cm2.
Nonlinear optical studies are carried out on graphene-based polymer composites in the nanosecond and picosecond temporal regime. These graphene-composites demonstrate saturable absorption followed by reverse saturable absorption which depends on graphene content and operation regime.
A one-dimensional metal nanocomposite-dielectric photonic crystal that shows 200% enhancement of the reflection band due to the interplay between the plasmon resonance of the silver nanoparticles and Bloch modes of the photonic crystal is demonstrated.
We demonstrate a three-fold increase in the nonlinear optical absorption of an engineered metal-nanocomposite based photonic crystal as compared to a single metal-nanocomposite film of comparable thickness using Z-scan measurements.
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