Accession Number : ADP007634

Title :   Terahertz Absorption between Split Subbands in Coupled Quantum Wells,

Corporate Author : AT AND T BELL LABS HOLMDEL NJ

Personal Author(s) : Roskos, Hartmut ; Nuss, Martin C. ; Shan, Jagdeep ; Tell, Ben ; Cunningham, Jack

Report Date : 22 MAY 1992

Pagination or Media Count : 7

Abstract : The transition between split subbands (design splitting: 5 meV) in n-doped coupled quantum wells is investigated by time-domain spectroscopy with ultrafast pulses of far-infrared radiation. This very strong transition has a linewidth of 2.5 meV. The maximum absorption is observed at 4.2 meV photon energy, lower than the design splitting. We attribute this down-shift of the peak absorption tentatively to the influence of many-body interactions which lead to correction terms for the calculated transition energy in the same order of magnitude as the transition energy itself.

Descriptors :   *FAR INFRARED RADIATION, *RESONANCE ABSORPTION, *ELECTROOPTICS, *INFRARED DETECTION, ABSORPTION, ENERGY, FAR INFRARED RADIATION, INFRARED RADIATION, INTERACTIONS, PHOTONS, PULSES, RADIATION, SPECTROSCOPY, SPLITTING, TIME DOMAIN, TRANSITIONS, GALLIUM ARSENIDES, DIPOLE ANTENNAS, SYMPOSIA.

Subject Categories : Electrooptical and Optoelectronic Devices
      Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE