Excitonic electroabsorption sampling: A new approach to femtosecond optoelectronics

Wayne H. Knox, J. E. Henry, K. W. Goossen, B. Tell, G. E. Doran, J. E. Cunningham, David A B Miller, D. S. Chemla, Stephen Goodnick

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The quantum-well exciton has been combined with a very-high-speed geometry for electrical signal propagation in the form of an ultrathin substrate coplanar stripline, resulting in a novel approach to femtosecond optoelectronics. The basic aspects of this technique as well as its limits and some applications are discussed. A 10-μm gold coplanar well layer grown on a thin AlGaAs stop etch layer on a GaAs substrate is shown. The back of the sample is etched away, leaving a free-standing film approximately 1-μm thick, in a 1- × 2-mm area. Electrical pulses can be generated in a standard manner, as in an Auston switch. However, the detection method is different from all other approaches. A probe beam is focused through the stripline and measures the exciton absorption at a particular time delay. The excitonic response to an applied field is essentially instantaneous. Thus, the microscopic electrical signal (actual field in the quantum well) can be internally probed with a time resolution given by the laser pulse. Some recent experimental results are reported.

Original languageEnglish (US)
Title of host publicationXVII International Conference on Quantum Electronics. Digest of
Place of PublicationPiscataway, NJ, United States
PublisherPubl by IEEE
Number of pages2
StatePublished - 1990
Externally publishedYes
Event17th International Conference on Quantum Electronics - IQEC '90 - Anaheim, CA, USA
Duration: May 21 1990May 25 1990


Other17th International Conference on Quantum Electronics - IQEC '90
CityAnaheim, CA, USA

ASJC Scopus subject areas

  • General Engineering


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