This Week at Physics

 
<< March 2018 >>
 
 >>
 >>
 >>
 >>
 >>
Sun Mon Tue Wed Thu Fri Sat
   1   2   3 
 4   5   6   7   8   9   10 
 11   12   13   14   15   16   17 
 18   19   20   21   22   23   24 
 25   26   27   28   29   30   31 
 
Add an Event Edit This Event

Physics Department Colloquia

<< Fall 2017 Fall 2018 >>
Subscribe your calendar or receive email announcements of events

Event Number 4561

  Friday, March 2nd, 2018

Fay Ajzenberg-Selove colloquium
Organisms manipulate light with crystal mirrors Structural colors, photonic crystals and vision
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: Lia Addadi, Weizmann Institute of Science
Abstract: Organisms build complex optical devices including diffuse scatterers, broadband reflectors, tunable photonic crystals and mirrors by controlling the size, morphology and the hierarchical organization of the component organic crystals from the nanoscale to the millimeter level. These devices perform a variety of optical functions, generating the white color of certain spiders, the metallic silvery reflectance of fish scales, the brilliant iridescent colors of some copepods, and mirrors used for vision in animal eyes. Scallops have tens of eyes, each containing a concave multi-layered mirror, seamlessly tiled with a mosaic of square crystals, and bearing a striking resemblance to the segmented mirrors of reflecting telescopes. Shrimp, crayfish and lobsters possess compound eyes that also use reflective optics, and contain two sets of mirrors with very different architectures and functions. We can rationalize all the biogenic structures and superstructures in terms of the optical performance of the devices.
Host: Pupa Gilbert
Add this event to your calendar
©2013 Board of Regents of the University of Wisconsin System