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Nonlinear optical and optical power limiting studies on a new thiophene-based conjugated polymer in solution and solid PMMA matrix |
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| Authors: | P Poornesh Pramod K Hegde MG Manjunatha AV Adhikari |
| Institution: | a Department of Physics, Manipal Institute of Technology, Manipal University, Manipal, Karnataka 576104, India b Department of Physics, National Institute of Technology Karnataka, Surathkal, Mangalore, Karnataka 575025, India c Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Mangalore, Karnataka 575025, India |
| Abstract: | An experimental investigation of the third-order nonlinear optical properties of new poly{2-{5-3,4-ditetradecyloxy-5-(1,3,4-oxadiazol-2-yl)thiophen-2-yl]-1,3,4-oxadiazol-2-yl}pyridine} (P) in tetrahydrofuran (THF) solution and in solid poly(methylmethacrylate) (PMMA) matrix, by Z-scan technique is reported. The Z-scan traces reveal that the composite films exhibit large negative nonlinear refractive index of the order 10−10 esu. The excited-state absorption cross-section was found to be larger than the ground-state absorption indicating that the operating nonlinear process is reverse saturable absorption (RSA). The new polymer P exhibits good optical power limiting properties in the nanosecond regime in solution and as well in solid PMMA matrix. |
| Keywords: | 42 65 k 42 65 An 42 70 Jk |
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