Photoinduced intersubband absorption in barrier doped multi-quantum-wells

Y. Garini, M. Olszakier, E. Cohen, E. Ehrenfreund, Arza Ron, K. K. Law, J. L. Merz, A. C. Gossard

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The intersubband absorption and its photomodulation by above barrier-gap excitation in a barrier n-doped GaAs/AlGaAs multiple quantum well structure are reported. The e1-e2 intersubband transition is observed as an absorption band centered at 149 meV and polarized along the growth axis. The photoinduced absorption measured at temperatures below 150K consists of two parts: a bleaching band at the low energy side of the e1-e2 absorption band, and an absorption band on its high energy side. The photoinduced bleaching below 149 meV is assigned to a reduction in the e1 electron population due to recombination with excess holes resulting from electrons captured by the barrier donors. The photoinduced absorption above 149 meV is probably due to the e1:hh1-e2:hh1 exciton absorption.

Original languageEnglish
Pages (from-to)287-290
Number of pages4
JournalSuperlattices and Microstructures
Issue number4
StatePublished - 1990
Externally publishedYes

Bibliographical note

Funding Information:
In summary, we have presented absorption and photoinduced absorption measurements in barrier-doped MQW. We have found that the effect of the pump light is two fold: (a) a reduction in the low energy tail of the el-e2 absorption band due to a reduction in the el electrons, and (b) an enhancement of the high energy side of the el-e2 absorption band due possibly to intersub-band exciton absorption as observed earlier in undoped MQW.4. s Acknowledgments-The work at the Technion was supported by the US-Israel Binational Science Foundation (BSF), Jerusalem, Israel (grant No. 86600073) and by the Vice President Fund for the Promotion of Research. The laboratories are under the auspices of the Center for Advanced Opto-Electronics.


Dive into the research topics of 'Photoinduced intersubband absorption in barrier doped multi-quantum-wells'. Together they form a unique fingerprint.

Cite this