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SUMMARY:Light-matter coupling in photonic crystal structures - Dr Celestin
 o Creatore \, University of Pavia
DTSTART:20091113T153000Z
DTEND:20091113T163000Z
UID:TALK21000@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:\nPhotonic crystals (PhCs) are structures characterized by a s
 patially \nperiodic dielectric\nfunction and are nowadays very appealing d
 ue to their rich physics. The\noccurrence of photonic band gaps\, i.e. fre
 quency regions where \npropagation of light\nis strongly inhibited make Ph
 Cs interesting for many applications. \nFurthermore\, the present accurate
 \nengineering of photonic states in PhCs\, gives the possibility to probe 
 \nboth the weak and strong coupling\nregimes of light-matter coupling. For
  the former limit\, we examine the \nmodifications\nof the spontaneous emi
 ssion from a dipole embedded in a generic \none-dimensional (1D)\nphotonic
  structure\, and we show a model derived within a \nquantum-electrodynamic
 al\nformalism\, discussing its extension to two-dimensional PhCs (like \nP
 hotonic Crystal\nslabs). For the strong-coupling regime\, we analyze some 
 interesting \nfeatures of exciton-polariton states\nresulting from (i)  bu
 lk excitons and the photonic modes in a 1D Bragg \ngrating and\n(ii) quant
 um well excitons and the photonic modes of a (2D) PhC slab.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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