RT - Journal Article T1 - Investigation of the Optical Bistability in the MNA polymeric thin films JF - opsi YR - 2014 JO - opsi VO - 20 IS - 0 UR - http://opsi.ir/article-1-47-en.html SP - 1637 EP - 1640 K1 - Optical Bistability K1 - MNA Thin Films K1 - Mach-Zehnder interferometer K1 - External Feedback AB - In this paper, the Optical Bistability (OB) of 2-Methyl-4-Nitroaniline (MNA) doped with PMMA polymer thin films on Mach-Zehnder interferometer with applied external feedback are investigated in five thicknesses. The measurements were performed at 532 nm using a NdYAG CW laser with irradiation of 300 mW. A hysteresis loop due to optical bistability obtained because of charge transfer in benzene ring. It is demonstrated that the gain of optical bistability improved with using external feedback for thinner samples. But in higher thicknesses, the local thermal effect decrease the gain and has negative effect on OB. LA eng UL http://opsi.ir/article-1-47-en.html M3 ER -