title: Diffusive Propagation of Exciton-Polaritons through Thin Crystal Slabs.
abstract: If light beam propagates through matter containing point impurity centers, the amount of energy absorbed by the media is expected to be either independent of the impurity concentration N or proportional to N, corresponding to the intrinsic absorption or impurity absorption, respectively. Comparative studies of the resonant transmission of light in the vicinity of exciton resonances measured for 15 few-micron GaAs crystal slabs with different values of N, reveal a surprising tendency. While N spans almost five decimal orders of magnitude, the normalized spectrally-integrated absorption of light scales with the impurity concentration as N(1/6). We show analytically that this dependence is a signature of the diffusive mechanism of propagation of exciton-polaritons in a semiconductor.
authors.affiliation: A.F. Ioffe Physico-Technical Institute, 26, Politechnicheskaya, 194021, St. Petersburg, Russia.
authors.forename: D A
authors.initials: DA
authors.lastname: Zaitsev
authors.affiliation: A.F. Ioffe Physico-Technical Institute, 26, Politechnicheskaya, 194021, St. Petersburg, Russia.
authors.forename: N D
authors.initials: ND
authors.lastname: Il'ynskaya
authors.affiliation: 1] A.F. Ioffe Physico-Technical Institute, 26, Politechnicheskaya, 194021, St. Petersburg, Russia [2] Spin Optics Laboratory, St. Petersburg State University, 1, Ulianovskaya, 198504, St. Petersburg, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Koudinov
authors.affiliation: A.F. Ioffe Physico-Technical Institute, 26, Politechnicheskaya, 194021, St. Petersburg, Russia.
authors.forename: N K
authors.initials: NK
authors.lastname: Poletaev
authors.affiliation: St-Petersburg Academic University, 8/3, Khlopina, 194021, St. Petersburg, Russia.
authors.forename: E V
authors.initials: EV
authors.lastname: Nikitina
authors.affiliation: 1] A.F. Ioffe Physico-Technical Institute, 26, Politechnicheskaya, 194021, St. Petersburg, Russia [2] ITMO University, Kronverkskiy pr., 49, 197101, St. Petersburg, Russia.
authors.forename: A Yu
authors.initials: AY
authors.lastname: Egorov
authors.affiliation: 1] Spin Optics Laboratory, St. Petersburg State University, 1, Ulianovskaya, 198504, St. Petersburg, Russia [2] Physics and Astronomy, University of Southampton, Highfield, Southampton, SO171BJ, United Kingdom.
authors.forename: A V
authors.initials: AV
authors.lastname: Kavokin
authors.affiliation: A.F. Ioffe Physico-Technical Institute, 26, Politechnicheskaya, 194021, St. Petersburg, Russia.
authors.forename: R P
authors.initials: RP
authors.lastname: Seisyan