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Passive All-optical Switches and Limiters Based on New Copolymer of Polyester (Polyvinylalcohol Grafted Rhodamine B)
M. A. Rahma, H. L. Saadon, Ali Q. Abdullah and M. Y. Shubar
Nonlinear optical response in new copolymer of polyester (polyvinyl alcohol grafted Rhodamine B) (CPPS-PVA-g-RhB) was used to realize passive all-optical switches and limiters. However, there is still a need, respectively, for passive all-optical switches and limiters with an optimization of the optical figures of merit with critical parameters and a low optical limiting threshold as possible. The all-optical switching and limiting effects of the CPPS-PVA-g-RhB were investigated. The results showed that with a modulation depth of 67% and a switching contrast of 4.8 dB at a switching time of 40 ms, the CPPS-PVA-g-RhB can provide all-optical switches at a pump power of 38 mW. With optical damage of 24.8 mW and a dynamic range of 1.32, the CPPS-PVA-g-RhB leads to realize all-optical limiters at an optical limiting threshold of 18 mW.
Keywords: Copolymer of polyester (polyvinylalcohol grafted Rhodamine B), nonlinear optical response, all-optical switching, optical limiting