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SUMMARY:Colloidal Quantum Dot Spasers and Plasmonic Amplifiers
DTSTART:20180309T151500
DTSTAMP:20260407T045506Z
UID:4574beb21af9747d38cb7c2a48e5f1ae79e4cefba65b2c40fe71be82
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. David J. Norris\,  Optical Materials Engineering Labor
 atory\, Dept. of Mechanical and Process Engineering\, ETH Zurich\, “Coll
 oidal Quantum Dot Spasers and Plasmonic Amplifiers\nSurface-plasmon polari
 tons (or plasmons for short) are electromagnetic waves with both electroni
 c and photonic character. In contrast to photons\, plasmons can be focused
  to the nanoscale\, enabling miniaturized devices for information and sens
 or technologies. Unfortunately\, plasmons suffer from significant intrinsi
 c losses\, and strategies to amplify plasmonic signals have been sought. T
 his has led to plasmonic lasers\, or “spasers\,” devices that actively
  generate plasmons of high intensity. However\, because previous spaser ef
 forts aimed primarily at obtaining the smallest possible laser\, their des
 igns were ill-suited for integration with other elements in a larger plasm
 onic circuit\, limiting their use. We will discuss a versatile class of qu
 antum-dot-based spasers whose design allows for the controlled on-chip gen
 eration\, extraction\, and manipulation of plasmons. By lithographically d
 efining block reflectors on ultrasmooth silver via template stripping [1]\
 , we fabricate stable\, aberration-corrected plasmonic cavities with high 
 quality factors (Q) at desired locations on a substrate. We then incorpora
 te colloidal quantum dots into these cavities with electrohydrodynamic pri
 nting [2\,3] or simple large-area drop-casting. Above low excitation thres
 holds\, monochromatic plasmons (0.65 nm linewidth at 630 nm\; Q ≈ 1000) 
 that match cavity modes are produced under ambient conditions [4]. This sp
 aser signal is then extracted\, directed through an integrated amplifier\,
  and focused at a nearby tip\, generating intense electromagnetic fields. 
 More generally\, our device platform can be deployed at different waveleng
 ths\, size scales\, and geometries on large-area plasmonic chips for funda
 mental studies and applications.\nReferences\n[1]    P. Nagpal\, N. C. L
 indquist\, S. H. Oh\, D. J. Norris\, Science 325\, 594 (2009).\n[2]    P
 . Galliker\, J. Schneider\, H. Eghlidi\, S. Kress\, V. Sandoghdar\, D. Pou
 likakos\, Nat. Commun. 3\, 890 (2012).\n[3]    S. J. P. Kress\, P. Richn
 er\, S. V. Jayanti\, P. Galliker\, D. K. Kim\, D. Poulikakos\, D. J. Norri
 s\, Nano Lett. 14\, 5827 (2014).\n[4]    S. J. P. Kress\, J. Cui\, P. R
 ohner\, D. K. Kim\, F. V. Antolinez\, K.-A. Zaininger\, S. V. Jayanti\, P.
  Richner\, K. M. McPeak\, D. Poulikakos\, D. J. Norris\, Sci. Adv. 3\, e17
 00688 (2017).\n \n 
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STATUS:CONFIRMED
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