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Investigation of third-order nonlinear optical properties of conjugated benzodioxal derivatives |
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| Authors: | Seetharam Shettigar P. Poornesh B.K. Sarojini K. Prakash Kamath |
| Affiliation: | a Department of Physics, NMAM Inst. of Technology, Nitte 574110, Karnataka, India b Department of Physics, Manipal Inst. of Technology, Manipal University, Manipal 576104, India c Department of Physics, National Institute of Technology, Surathkal 575025, Karnataka, India d Department of Chemistry, P.A. College of Engineering, Nadupadavu, Mangalore 574153, Karnataka, India e Department of Chemistry, Mangalore University, Mangalagangothri 574199, India f Department of Physics, Mangalore University, Mangalagangothri 574199, India |
| Abstract: | An investigation of third-order nonlinear optical characterization of newly synthesized conjugated benzodioxal derivatives has been done by using nanosecond Z-scan technique at 532 nm. The molecules demonstrate self-defocusing effect with intensity dependent refractive index (n2) of the order of 10−14 cm2/W. The measured molecular TPA cross-section is ranging from 2.47 ×10−47 cm4 s/photon to 6.00 cm4 s/photon. Their input-output curves indicate that there is a clear optical power limiting behavior with the limiting threshold in the range 125-181 μJ. The main factor to exhibit the observed nonlinearity in these molecules is the presence of charge donor and acceptor groups. The increased conjugation length increases the nonlinear refraction and increased electron density enhances the nonlinear absorption. The molecules exhibit good nonlinear optical properties, comparable to those of regular azoaromatic compounds. Therefore, the molecules investigated here are promising candidates for optical power limiting devices. |
| Keywords: | Conjugated systems Third-order susceptibility Optical power limiting |
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