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EPSRC Reference: GR/J38581/01
Title: SYNTHESIS AND ASSESSMENT OF NEW MATERIALS WITH FREQUENCY DEPENDANT DI- ELECTRICS AXES FOR NON-LINEAR OPTICS
Principal Investigator: Wallis, Professor JD
Other Investigators:
Pugh, Dr D Bailey, Dr R Sherwood, Professor JN
Cruickshank, Dr F
Researcher Co-Investigators:
Project Partners:
Department: Chemistry
Organisation: University of Kent
Scheme: Standard Research (Pre-FEC)
Starts: 27 January 1994 Ends: 26 April 1996 Value (£): 90,105
EPSRC Research Topic Classifications:
Materials Synthesis & Growth
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:  
Summary on Grant Application Form
Large, single crystals of (-)-2-(-methylbenzylamino)-5-nitropyridine, (MBANP), are extremely efficient frequency doublers. This compound has the property, unique amongst efficient non-linear optical organics studied so far, that its dielectric axes rotate with respect to the crystallographic axes as a function of frequency. Recent work indicates that this property invalidates Kleinman symmetry and possibly also the Zyss-Oudar theory relating the molecular hyperpolarisability to the non-linear susceptibility of the crystal. The present proposal is to synthesise 8 methyl substituted derivatives of MBANP, such that this small structural perturbation will most probably retain this unusual property of the dielectric axes (which is a consequence of the three-dimensional structure of the molecule) while varying the crystal packing geometry enough to test the Zyss-Oudar theory in this type of material. If the Zyss-Oudar theory does require modification, it follows that current methods of finding non-critical phase-matching and optimum OPO orientations are seriously wrong and the performance of these materials is being significantly underestimated!
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Organisation Website: http://www.kent.ac.uk