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SUMMARY:Pathway to Nonlinear Spectroscopy of Discrete Dipoles - Haydn Lloy
 d\, University of Cambrisge
DTSTART:20191113T144000Z
DTEND:20191113T150000Z
UID:TALK130450@talks.cam.ac.uk
CONTACT:Lisa Masters
DESCRIPTION:This project looks to examine nonlinear spectra of interfaces 
 using correlations in transverse electric fields. This experimental techni
 que is used to study the properties of surfaces\, and has been conventiona
 lly been described in terms of second order susceptibility. The representa
 tion in terms of  correlations of propagating photons (transverse electric
  fields) is useful as a link to the physical mechanism  of nonlinear optic
 s.\n\nThis work represents the first steps of this project. This starts wi
 th an overview of the classical method used to obtain electric fields and 
 their frequencies given a model for the dielectric constant. Then\, it is 
 noted that in the final simulations\, a point dipole approximation will be
  used\, and the induced polarisation is expected to be a Bloch wave\, rath
 er than being periodic over the lattice. It is therefore noted that standa
 rd Ewald sums for computing the electrostatic energy of this system\, and 
 dipole-dipole interaction tensors\, required for dynamic optimisation of t
 he dipoles must be modified to account for this. The second strand of this
  work presents the mathematical theory behind these ``Bloch Sums''  as wel
 l as some potential applications thereof. The final section gives an outli
 ne of future work to follow\, in particular an overview of the discrete di
 pole approximation to be used\, as well as how to obtain a dielectric cons
 tant from a system of polarisable point scatterers.\n
LOCATION:Department of Chemistry\, Cambridge\, Unilever lecture theatre
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