Accession Number : ADA330571

Title :   Femtosecond Laser Probing of Non-Thermal Electronic Transport. AASERT Program.

Descriptive Note : Final technical rept. 1 Sep 93-31 Aug 97,

Corporate Author : CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB

Personal Author(s) : Bokor, Jeffrey

PDF Url : ADA330571

Report Date : 30 SEP 1997

Pagination or Media Count : 53

Abstract : The goal of this research effort has been the application of high intensity THz pulses, generated by a large aperture planar photoconducting transmitter, in studying nonlinear phenomena in GaAs and Si. The ultimate interest in this is a better understanding of the response of free carriers in semiconductors to high electric fields, a subject of great importance in modern electronic devices. The THz generator offers the capability of producing a peak electric field in the range of 100 kV/cm, well into the range of high-field, hot carrier phenomena. In addition, due to the short duration of this pulse, the dynamics of carriers in high fields may be studied directly in the time domain, using the powerful techniques developed for femtosecond laser spectroscopy experiments. At high fields, carrier velocities become nonlinear in applied field. This forms the basis for the expectation of a nonlinear response of a doped semiconductor to a high intensity THz pulse passing through it.

Descriptors :   *ELECTRON TRANSPORT, *PULSED LASERS, ELECTROOPTICS, GALLIUM ARSENIDES, ENERGY GAPS, PULSE GENERATORS, NONLINEAR SYSTEMS, SILICON, HIGH TEMPERATURE SUPERCONDUCTORS, TIME DOMAIN.

Subject Categories : Lasers and Masers
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE