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SUMMARY:Scattering Optical Elements: Inverse design of dielectric photonic
  devices - Andreas Håkansson\, National Institute for Material Science\, 
 Tsukuba\, Japan
DTSTART:20061013T133000Z
DTEND:20061013T143000Z
UID:TALK5384@talks.cam.ac.uk
CONTACT:Chris McNeill
DESCRIPTION:Inverse design (ID) is based on a black box optimization probl
 em. Here intuition normally is a bad thing\, guiding the design process in
 to wrong paths making the black box rather look gray. A pure inverse desig
 ned device includes very few input parameters set by the designer. In othe
 r words\, the more the designer rely on the optimization process to solved
  his problem rather than himself\, the better the result. Scattering Optic
 al Elements (SOE) is a new family of optical devices designed using the ID
  approach. SOEs can be described as second generation DOE devices where th
 e concept of multiple scattering is included. By optimizing the positions 
 and/or size of an array of dielectric scattering elements the image of the
  scattered light can be controlled with very high accuracy. This seminar w
 ill walk you through the basics of the implemented ID tool\, including the
  Multiple Scattering Theory\, used to solve Maxwell's equations for two-di
 mensional dielectric material distributions\, and the Genetic Algorithm\, 
 where the evolution\, seen through the eyes of Darwin\, is used as an opti
 mization process. It will be shown how this ID tool can be applied for aut
 omatic design of a library of different photonic devices such as lenses[1-
 2]\, wavelength de-multiplexer[3-4] or optical sources[5].\n\n[1] L. Sanch
 is et al.\, Appl. Phys. Lett. 84\, 4460 (2004)\n[2] A. Håkansson et al.\,
  IEEE J. Sel. Areas Comm. 23\, 1365 (2005)\n[3] A. Håkansson et al.\, Opt
 . Comm. 13\, 5440 (2005)\n[4] A. Håkansson et al.\, Appl. Phys. Lett. 87\
 , 193506 (2005)\n[5] A. Håkansson et al.\, Phys. Rev. Lett. 96\, 153902 (
 2006)\n
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, Department of Phys
 ics
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