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SUMMARY:Control and manipulation of spontaneous emission in photonic cryst
 al and plasmonic nanostructures - Michael Kaniber (TU Munich)
DTSTART:20110314T153000Z
DTEND:20110314T170000Z
UID:TALK30080@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Photonic and plasmonic nanostructures offer an efficient and p
 ractical opportunity to manipulate and control the emission of light from 
 semiconductor quantum dots down to the single photon level. Enhancing the 
 internal and external quantum efficiency of the emission\, modifying the s
 pontaneous emission dynamics and guiding light between different locations
  on the same semiconductor chip are only a few interesting aspects of such
  nanostructures.\nI will begin by discussing the coupling of an individual
  self-assembled InGaAs quantum dot to a photonic crystal linear waveguide 
 where we managed to demonstrate routing of single quanta of light by apply
 ing Hanbury-Brown and Twiss photon correlation spectroscopy. Such waveguid
 es will act as fundamental building blocks for more advanced on-chip optic
 al components (e.g. junctions\, beamsplitters\, etc.) and might act as qua
 ntum channels in future quantum networks\, interconnecting two photonic cr
 ystal nanocavities.  \nI will then discuss the use of photonic crystal nan
 ocavities to enhance the light extraction in Silicon/Silicon-Germanium bas
 ed semiconductor heterostructures. Here\, we could demonstrate that the co
 upling of the emission from Silicon to the localised modes of two-dimensio
 nal photonic crystal nanocavities enhances the emission by more than a fac
 tor 400x. Temperature dependent studies show that the mode emission persis
 ts even up to room temperature and indicate that the enhancement of the ph
 otoluminescence intensity might be partly caused by increased internal qua
 ntum efficiency due to the Purcell effect. I will also present first resul
 ts on optically active photonic crystal nanocavities using Germanium islan
 ds.  \nFinally\, I will discuss a selection of research activities on the 
 optical investigation of lithographically defined metallic nanostructures.
  Both periodic arrays consisting of triangular shaped Au nanoparticles as 
 well as Au waveguides have been fabricated using electron beam lithography
  and optically studied by white light transmission and micro-photoluminesc
 ence spectroscopy\, respectively. Localised surface plasmon resonances hav
 e been observed in the nanoparticle arrays that could lead to strong enhan
 cements of the emission of nearby emitters and\, thus\, might modify their
  spontaneous emission dynamics. In strong contrast\, travelling surface pl
 asmons are observed in metallic waveguides giving rise to the opportunity 
 to distribute\, route and control light on a chip over nanometre length sc
 ales. \n
LOCATION:Rutherford building\, Seminar Room B
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