Project Title: Synthesis of novel organic crystals for nonlinear optical studies
Funding Agency: Vision Group on Science and Technology (VGST), Department of IT, BT and Science and Technology, Govt. of Karnataka
Funding Scheme: Research Grant for Scientist/Faculty (RGS/F)
Ref No.: No. KSTePS/VGST-RGS/F/GRD No.588/2017-18
Principal Investigator: Dr. E Deepak D’silva
Coordinator and Assistant Professor
PG Department of Physics
Over last two decades there is an enduring interest to make use of organic molecular systems in the (NLO) devices. Organic nonlinear optical (NLO) materials have been extensively studied because of their potential application in integrated optical signal processing, and optical switching, etc. Poled polymeric materials are promising materials for second-order NLO materials. They have large susceptibilities, fast response times, excellent mechanical and physical properties, and good to be process ability.
It is well known that, for a practical second harmonic generation nonlinear optical (SHG/NLO) material, one of its important properties is its stable non-centrosymmetric arrangement of chromophores. As the regular orientation of the polar chromophores would be damaged by the molecular thermal movement, the SHG activity decays fast. To obtained materials having persistency in the intrinsic second order nonlinearity over an extended period of time under desired conditions, is a challenging requirement. Presently, there is an intensive search for novel nonlinear optical (NLO) materials that may be used to design and prepare improved waveguide devices for nonlinear optical applications. Organic materials offer a number of advantages over inorganic crystals because of their high and ultra fast nonlinear response and a low dielectric constant, as well as the enormous design flexibility allowed by molecular engineering.
The main goal of the present study is to obtain a good medium for all-optical applications, by enhancing 3-rd order nonlinear Kerr effect. New organic materials they exhibit a promising performance in NLO applications and acceptable properties for technological preparation of channel waveguides.
Objectives of the project:
To synthesize the organic materials
Crystalize the materials to obtain respective seed crystals
Seed crystals are subjected to bulk growth
Crystals are then subjected to powder and single crystal XRD techniques to study and confirm their crystal structure
To study the mechanical and linear properties (hardness, refractive index and UV-Vis studies) of the crystals
To study the thermal stability of the crystal (DSC/ TG/DTA)
Study the nonlinear properties such as second harmonic generation and third order nonlinear optical properties (Z-scantechnique)
Establishing firm structure property relationship.
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