Abstract This paper studies both the intraband polarization and terahertz emission of a semiconductor superlattice in combined dc and ac electric fields by using the superposition of two identical time delayed and phase shifted optical pulses. By adjusting the delay between these two optical pulses, our results show that the intraband polarization is sensitive to the time delay. The peak values appear again for the terahertz emission intensity due to the superposition of two optical pulses. The emission lines of terahertz blueshift and redshift in different ac electric fields and dynamic localization appears. The emission lines of THz only appear to blueshift when the biased superlattice is driven by a single optical pulse. Due to excitonic dynamic localization, the terahertz emission intensity decays with time in different dc and ac electric fields. These are features of this superlattice which distinguish it from a superlattice generated by a single optical pulse to drive it.
Received: 09 March 2009
Revised: 06 July 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10647132) and the
Scientific Research Fund of Hunan Provincial Education Department of
China (Grant No 05B014).
Cite this article:
Li Min(李敏) and Mi Xian-Wu(米贤武) Intraband dynamics and terahertz emission in biased semiconductor superlattices coupled to double far-infrared pulses 2009 Chin. Phys. B 18 5534
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