TY - GEN
T1 - Coherent interactions and femtosecond pulse propagation in semiconductors
AU - Koch, S. W.
AU - Binder, R.
AU - Hu, Y. Z.
AU - Jahnke, F.
AU - Knorr, A.
AU - Lindberg, M.
AU - Schafer, W.
PY - 1994
Y1 - 1994
N2 - The optical response of semiconductors on an ultrafast (femtosecond) time scale is significantly affected by many-particle interactions of the excited electrons and holes. In this paper we address three aspects: (1) coherent excitation dynamics in systems of different dimensionality, (2) signatures of memory effects in dephasing processes, and (3) pulse propagation effects. First, we show that the influence of the coherent exchange interaction, which modifies the external field and increases the effective Rabi frequency, is similar in bulk and quantum-well systems but is reduced in thick quantum wires. Secondly, we study incoherent effects. To determine the non-Markovian character of dephasing processes in a two-pulse scenario, we propose the use of chirped pulses. The theoretical results were obtained with a Gaussian memory function that models dephasing due to electronphonon scattering. Finally, the influence of exchange and correlation effects on the pulse propagation is discussed for both noninverted semiconductors and semiconductor amplifiers. The problem of long-distance propagation is addressed, and, in particular, recent results are presented for a gain-absorption compensation; these results indicate the possibility of long-distance propagation of light pulses in amplifiers.
AB - The optical response of semiconductors on an ultrafast (femtosecond) time scale is significantly affected by many-particle interactions of the excited electrons and holes. In this paper we address three aspects: (1) coherent excitation dynamics in systems of different dimensionality, (2) signatures of memory effects in dephasing processes, and (3) pulse propagation effects. First, we show that the influence of the coherent exchange interaction, which modifies the external field and increases the effective Rabi frequency, is similar in bulk and quantum-well systems but is reduced in thick quantum wires. Secondly, we study incoherent effects. To determine the non-Markovian character of dephasing processes in a two-pulse scenario, we propose the use of chirped pulses. The theoretical results were obtained with a Gaussian memory function that models dephasing due to electronphonon scattering. Finally, the influence of exchange and correlation effects on the pulse propagation is discussed for both noninverted semiconductors and semiconductor amplifiers. The problem of long-distance propagation is addressed, and, in particular, recent results are presented for a gain-absorption compensation; these results indicate the possibility of long-distance propagation of light pulses in amplifiers.
UR - http://www.scopus.com/inward/record.url?scp=0028578516&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028578516&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0028578516
SN - 0780319737
T3 - Proceedings of the International Quantum Electronics Conference (IQEC'94)
SP - 144
EP - 145
BT - Proceedings of the International Quantum Electronics Conference (IQEC'94)
PB - Publ by IEEE
T2 - Proceedings of the 21st International Quantum Electronics Conference (IQEC'94)
Y2 - 8 May 1994 through 13 May 1994
ER -