Title :
Analysis of transient interband light modulation by ultrashort intersubband resonant light pulses in semiconductor quantum wells
Author :
Neogi, Arup ; Takahashi, Y. ; Kawaguchi, Hitoshi
Author_Institution :
FESTA Labs., Yamagata Univ., Yonezawa, Japan
fDate :
11/1/1997 12:00:00 AM
Abstract :
We explore the transient characteristics of an interband resonant light modulation process by ultrashort intersubband resonant light pulses in semiconductor quantum wells (QW´s). The modulation characteristics in a three-level semiconductor QW system, including the effects due to in-plane momentum, have been investigated by a numerical analysis of the coupled Bloch equations using a density-matrix approach. We have studied the effect of the carrier density and the nature of the intersubband coupling light on the transient absorption features of the interband light. The modulation process has been compared in doped and undoped QW´s. The switching behavior of the strong interband light field in presence of a train of intersubband light pulses has also been discussed
Keywords :
carrier density; electro-optical modulation; electro-optical switches; high-speed optical techniques; semiconductor device models; semiconductor quantum wells; transients; carrier density; coupled Bloch equations; density-matrix approach; doped QW´s; in-plane momentum; interband resonant light modulation process; intersubband coupling light; intersubband light pulse trains; modulation characteristics; modulation process; numerical analysis; semiconductor quantum wells; strong interband light field; switching behavior; three-level semiconductor QW system; transient absorption features; transient characteristics; transient interband light modulation; ultrashort intersubband resonant light pulses; undoped QW´s; Absorption; Nonlinear optical devices; Nonlinear optics; Optical coupling; Optical modulation; Optical superlattices; Pulse modulation; Resonance; Transient analysis; Ultrafast optics;
Journal_Title :
Quantum Electronics, IEEE Journal of
