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SUMMARY:Extrinsic and Intrinsic Defects in Colloidal Photonic Crystals - P
 rof Doug D Perovic\, Department of Materials Science and Engineering\, Uni
 versity of Toronto
DTSTART:20060420T140000Z
DTEND:20060420T150000Z
UID:TALK4855@talks.cam.ac.uk
CONTACT:Edmund Ward
DESCRIPTION: Photonic Crystals are an emerging class of material and offer
  important applications to integrated optics and photonics. Such crystals 
 consist of an arrangement of dielectric material having spatial periodicit
 y on the scale of optical wavelengths\, and can exhibit unique optical phe
 nomena such as a full-photonic bandgap. Self-assembled colloidal crystals\
 , commonly referred to as "opals"\, present a facile and inexpensive route
  to the fabrication of 3-D photonic crystals. Yet\, while bulk\, monolithi
 c opals can be readily produced and offer a scientifically interesting mat
 erial for study\, extrinsic defects need to be deliberately introduced int
 o the lattice to create photonic functionality. A method to produce robust
  linear extrinsic defects into colloidal crystals\, which can potentially 
 serve as low-loss optical waveguides\, will be presented. Also\, an analys
 is of stacking faults\, a commonly occurring intrinsic defect\, will also 
 be outlined. A mechanism for the formation of stacking faults in opal film
 s is found to be similar to one operating on the atomic scale.
LOCATION:T001 [Tower Seminar Room]\, Materials Science and Metallurgy\, De
 partment of
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