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CATEGORIES:Theory - Chemistry Research Interest Group
SUMMARY:Pathway to Nonlinear Spectroscopy of Discrete Dipo
les - Haydn Lloyd\, University of Cambrisge
DTSTART;TZID=Europe/London:20191113T144000
DTEND;TZID=Europe/London:20191113T150000
UID:TALK130450AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/130450
DESCRIPTION:This project looks to examine nonlinear spectra of
interfaces using correlations in transverse elect
ric fields. This experimental technique is used to
study the properties of surfaces\, and has been c
onventionally been described in terms of second or
der susceptibility. The representation in terms of
correlations of propagating photons (transverse
electric fields) is useful as a link to the physic
al mechanism of nonlinear optics.\n\nThis work re
presents the first steps of this project. This sta
rts with an overview of the classical method used
to obtain electric fields and their frequencies gi
ven a model for the dielectric constant. Then\, it
is noted that in the final simulations\, a point
dipole approximation will be used\, and the induce
d polarisation is expected to be a Bloch wave\, ra
ther than being periodic over the lattice. It is t
herefore noted that standard Ewald sums for comput
ing the electrostatic energy of this system\, and
dipole-dipole interaction tensors\, required for d
ynamic optimisation of the dipoles must be modifie
d to account for this. The second strand of this w
ork presents the mathematical theory behind these
``Bloch Sums'' as well as some potential applicat
ions thereof. The final section gives an outline o
f future work to follow\, in particular an overvie
w of the discrete dipole approximation to be used\
, as well as how to obtain a dielectric constant f
rom a system of polarisable point scatterers.\n
LOCATION:Department of Chemistry\, Cambridge\, Unilever lec
ture theatre
CONTACT:Lisa Masters
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