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SUMMARY:Physikalisches Kolloquium: Prof. Dr. Gerd Schröder-Turk - Dev
 elopment of optical Gyroid nanostructures in green butterflies
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 00000010000000BEB060FEC9762C43927071AB32719CD2
DESCRIPTION:Titel: Development of optical Gyroid nanostructures in gre
 en butterflies Abstract: Several green butterflies generate their gree
 n coloration as a photonic crystal effect using a 3D nanostructure kno
 wn as the Gyroid. The structure of the mature butterfly nanostructures
  is easy to image by electron and X-ray microscopy and well characteri
 sed\, and its photonic properties are well understood. However\, the m
 echanisms by which the butterfly forms these nanostructures\, and part
 icularly how it stabilises a highly ordered geometry at the large leng
 th scale of 100s of nanometers\, is not fully understood. In this talk
 \, I will discuss our optical microscopy observations on living butter
 fly pupae that are suitably dissected to reveal the area of interest. 
 Like any conventional microscopy\, our optical data cannot resolve the
  nanostructure\; it is below the diffraction limit. However\, we can r
 esolve the reflectances that the nanostructure causes. Together with e
 lectron microscopy analyses of tissue samples\, these reflectances can
  be used to at least provide information of the timing of nanostructur
 e development. When we carried out these analyses\, we made the surpri
 sing finding that\, at the early stages of development\, the nanostruc
 ture is composed of fibrils woven together to form the 3D nanostructur
 e\; how it transitions to the smooth nanostructural form observed in m
 ature butterflies is not currently known. Sprecher / Speaker: Prof. Dr
 . Gerd Schröder-Turk Kontakt / Contact: Prof. Dr. Ben Fabry
DTSTART:20260715T100000Z
DTEND:20260715T110000Z
LOCATION:Hörsaal D\, Staudtstr. 5\, 91058 Erlangen
DTSTAMP:20260422T021531Z
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