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SUMMARY:Sum-rules and quantum limits: Using first principles to understand
  nonlinear optical behaviour - Dr J. Pérez-Moreno\, University of Leuven\
 , Belgium
DTSTART:20071101T160000Z
DTEND:20071101T170000Z
UID:TALK8402@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:Much progress has been made in improving the molecular hyperpo
 larizability (i.e. the nonlinear susceptibility per molecule) by construct
 ing larger structures with lots of pi-delocalized electrons.  However\, th
 is bigger-is-better approach does not help to answer the more fundamental 
 question of what intrinsic molecular properties yield the largest response
 . We introduce a novel analysis (the quantum limits analysis) which is sim
 ple to apply and combines first principles with experimental results. The 
 quantum limits analysis allows us to determine the intrinsic nonlinear eff
 iciency of a structure and highlights the underlying physical principles b
 ehind the nonlinear response of molecules.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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