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UID:69e22e05e4c0d
DTSTART:20260205T140000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20260205T150000Z
LOCATION:ICFO Auditorium
SUMMARY:ICFO | MARK BRONGERSMA
CLASS:PUBLIC
DESCRIPTION:ABSTRACT: \nMetamaterials are a new\, emerging class of high-pe
 rformance materials that derive their unique\, physical properties from th
 e way they are structured. In the first part of this presentation\, I will
  focus on the creation of 2-dimensional metamaterials (i.e. metasurfaces) 
 by nanopatterning thin layers of semiconductors and metals. I will argue t
 hat metasurfaces are ideal building blocks for next generation optical sen
 sing and imaging technologies. I will highlight the possibility of using i
 ntegrated metasurfaces to realize entirely new imaging modalities\, such a
 s the imaging of texture.\nIn the second part of my talk\, I will explain 
 how metamaterials concepts can be used reduce the opacity of tissue and sk
 in due to unwanted light scattering from the refractive index mismatch amo
 ng its components. Conventionally\, water and/or liquids need to be remove
 d to make biological tissues transparent by minimizing refractive index mi
 smatch\; however\, this process hinders achieving transparency in live tis
 sues. I will discuss the counterintuitive observation that strongly absorb
 ing molecules can achieve optical transparency in live biological tissues.
  I will highlight the physics behind this phenomenon and show that when st
 rongly absorbing molecules dissolve in water to form a liquid metamaterial
 \, they can modify its refractive index via the Kramers-Kronig relations t
 o match that of high-index tissue components like lipids. We demonstrate t
 hat this straightforward approach can reversibly render the mouse abdomina
 l wall transparent to allow visualization of digestive tract peristalsis a
 nd image myenteric ganglia microscopically.\n&nbsp\;
DTSTAMP:20260417T125637Z
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