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Prof. G. Umesh
| Speaker: |
Prof.dr. G. Umesh (Nat. Institute of Technology Karnataka,
Mangalore, India)
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| Date: |
Thursday February 15, 2007
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| Title: |
Organic and
Polymer materials for Nonlinear Optical Devices
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Abstract
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Organic
and polymer materials have been extensively investigated over the last
two decades due to their potential applications to nonlinear optical
(NLO) devices. A large variety of these materials possess unusually
large NLO coefficients and switching times in the sub-picosecond time
scales. Further, device fabrication is easier with organic materials
since they are generally soft-materials. The focus of our work has been
on the third order NLO properties of organics, such as Sydnones,
Chalcones, Thiophenes,etc., and polymers doped with these organics. We
have been synthesizing new organic compounds in the search for
materials with larger NLO coefficients. We have measured the
transmissivity of the organic samples as a function of the incident
laser intensity. In particular we are trying to arrive at a design
strategy to develop materials suitable for optical power limiters and
optical switching devices. Very recently we have started modelling of
the synthesized organic molecules using the “Materials Studio 4.0”
software. I will present some of the results of our current research
work on NLO materials.
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