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PRODID:https://murmitoyen.com/events/vanille/udem/
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UID:69decfe346544
DTSTAMP:20260414T193811
DTSTART:20150209T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/575669-optical-coatin
 gs-for-security-devices-from-nanostructured-coatings-to-smart-materials-b-
 baloukas-poly-mtl
LOCATION:Polytechnique Montréal - Pavillon J.-Armand-Bombardier\, 5155\, a
 venue Decelles\, Montréal\, QC\, Canada\, H3T 2B1
SUMMARY:Optical coatings for security devices:  From nanostructured coating
 s to smart materials - B. Baloukas (Poly Mtl)
DESCRIPTION:B. Baloukas and L. Martinu\, Département de génie physique\,
  École Polytechnique de MontréalCounterfeiting of products and importan
 t documents is at an all-time high and is costing the world economy hundre
 ds of billions of dollars yearly as well as posing significant safety and 
 health hazards through the production of uncertified goods\, e.g.\, pharma
 ceutical products. To limit these effects\, interference-based optical sec
 urity devices offering an angular color shift are still widely in use. Unf
 ortunately\, commercial iridescent materials are now readily available and
  represent a potential source of counterfeiting.In this short talk\, we fi
 rst briefly introduce the activities in our Functional Coatings and Surfac
 e Engineering Laboratory (FCSEL). We then describe the basic principles be
 hind passive interference security image structures and the qualities whic
 h have resulted in their integration into most currently in use important 
 documents.Emphasis will then be put on active materials which have recentl
 y been proposed as a means of augmenting present-day passive technologies.
  While there exist many possibilities\, electrochromic (EC) materials are 
 particularly interesting candidates. We focus our discussion on WO3 and pr
 esent various examples where the use of this material in different nanostr
 uctured forms can lead to innovative optical effects with an emphasis on t
 he electrochromic performance of individual films as well as when implemen
 ted into more complex structures.Finally\, we demonstrate that these innov
 ative structures not only possess an EC color change but also an angular c
 olor shift. While these characteristics make them interesting candidates f
 or security features possessing two levels of authentication\, they may al
 so be of interest for applications such as EC windows and others.Voici le 
 lien vers la page web du Laboratoire des Revêtements Fonctionnels et d'I
 ngénierie des Surfaces (LaRFIS)Cette conférence est présentée par le R
 QMP Versant Nord du Département de physique de l'Université de Montré
 al et le Département de génie physique de Polytechnique Montréal.
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