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SUMMARY:Single Molecules and Single Gold Nanoparticles as Optical Windows 
 on the Nanoscale
DTSTART:20170420T163000
DTEND:20170420T173000
DTSTAMP:20260415T011213Z
UID:1c8e9926e2d1e95f1b42118190dce8240ce928828a021cf9b1df675d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. M.A.G.J Orrit\, \nLeiden University\nNetherlands\nThe o
 ptical detection and study of single molecules and other nano-objects prov
 ide unique insights into the dynamics of nano-objects and their surroundin
 gs [1]. They also relate to several branches of physics\, as I shall illus
 trate with some recent experiments.\ni) The lifetime-limited lines of sing
 le molecules at cryogenic conditions probe acoustic [2] and electric pertu
 rbations\, making them attractive for quantum optomechanics.\nii) We recen
 tly studied the dynamics of vapor nanobubbles created in the liquid surrou
 nding a single immobilized gold nanosphere. These nanobubbles form in an i
 nstable\, explosive process before collapsing and can react to sound waves
  [3].\niii) Photothermal microscopy opens the study of non-fluorescent abs
 orbers\, down to single-molecule sensitivity [4]. The high signal-to-noise
  ratio enables local plasmonic and chemical probing [5] (see Fig. 1). Fluo
 rescence enhancements in excess of thousand-fold can be observed in a gold
  nanorod near field at resonance.\niv) The intense near-field at the tip o
 f plasmonic nanorods enhances excitation and emission of single molecules 
 diffusing in the area. Enhanced fluorescence opens single-molecule spectro
 scopy of dyes with very low fluorescence yields [6].\n\nReferences:\n[1] F
 . Kulzer et al.\, Angew. Chem. Int. Ed. 49 (2010) 854.\n[2] Y. Tian et al.
  Phys. Rev. Lett. 113 (2014) 135505.\n[3] L. Hou et al.\, New J. Phys. 17 
 (2015) 013050\n[4] A. Gaiduk et al. Science 330 (2010) 353\n[5] P. Zijlstr
 a et al.\, Nature Nanotech. 7 (2012) 379.\n[6] S. Khatua et al.\, ACS Nano
  8 (2014) 4440.\n\n 
LOCATION:BCH 2201 https://plan.epfl.ch/?room==BCH%202201
STATUS:CONFIRMED
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