Accession Number : ADP007637

Title :   Femtosecond Spatiotemporal Field Measurements in GaAs Quantum Wells,

Corporate Author : AT AND T BELL LABS HOLMDEL NJ

Personal Author(s) : Knox, W. H. ; Doran, G. E. ; Cunningham, J. ; Ramaswamy, M. ; Goodnick, S. M.

Report Date : 22 MAY 1992

Pagination or Media Count : 6

Abstract : Excitonic electroabsorption has been used recently to detect ultrafast electrical transients in ultra-thin quantum well coplanar striplines with time resolution as fast at 180 fs . The use of thin films of quantum wells as both generator and detector of electrical signals with coplanar stripline interconnection results in several interesting capabilities. First, since the exciton exhibits a sensitive saturation response with resonant excitation, it can be used as an in-situ calibration of the excitation and probing response functions. This nonlinear response is instantaneous, since it is based on excitonic phase space filling . Second, the exciton exhibits sensitive electroabsorption in either parallel (field ionization mode) or perpendicular (quantum-confined stark effect - field ionization inhibited mode) electric fields.

Descriptors :   *ELECTROOPTICS, *OPTICAL DETECTION, *MAPPING, CALIBRATION, DETECTORS, ELECTRIC FIELDS, EXCITATION, EXCITONS, FILMS, FUNCTIONS, GENERATORS, IONIZATION, PHASE, RESOLUTION, RESPONSE, SATURATION, SIGNALS, STARK EFFECT, THIN FILMS, TRANSIENTS, GALLIUM ARSENIDES, RESONANCE, DYE LASERS, NONLINEAR OPTICS, OPTICAL PUMPING, SYMPOSIA.

Subject Categories : Electrooptical and Optoelectronic Devices
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE