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SUMMARY:Light-matter interaction in plasmonic nanoparticle crystals
DTSTART:20191025T151500
DTSTAMP:20260407T163346Z
UID:f5ec42a66f11695e89dc516ca3817aab3bd9852ca12ed061a7207c66
CATEGORIES:Conferences - Seminars
DESCRIPTION:Stephanie Reich (Freie Universität Berlin)\nNanosized metal p
 articles absorb and scatter light through the collective excitations of th
 eir free electrons. The excitation of these plasmons gives rise to the bri
 ght red color of nanoparticle-stained glass. It also enhances optical proc
 esses close to the metal and is exploited for sensing and analytics. A lar
 ge part of the plasmon energy is stored in electromagnetic near fields at 
 the metal surface. When two particles are close together\, their near fiel
 ds interact resulting in hybridized collective states. This led to the ide
 a of nanoparticle agglomerates as plasmonic molecules\, polymers\, and cry
 stals. In my talk\, I will consider crystals of close-packed plasmonic nan
 oparticles\, where the interparticle distance is much smaller than the par
 ticle size. The interaction of light with the crystal plasmons is shown to
  be so strong that the interaction strength exceeds the plasmon frequency.
  The light-matter Hamiltonian becomes dominated by terms that create virtu
 al excitations in the ground state and separate light and matter in freque
 ncy and space. We realized such materials by growing face centered cubic s
 upercrystals from gold nanoparticles. Their optical properties reveal Rabi
  frequencies of several eV. Metallic and semiconducting nanoparticles may 
 work as building blocks for an entire class of materials with extreme ligh
 t-matter interaction. They will have application in nonlinear optics\, the
  search for cooperative effects and novel ground states\, polariton chemis
 try\, and quantum information technology.
LOCATION:CE 1 5 https://plan.epfl.ch/?room==CE%201%205
STATUS:CONFIRMED
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