Far-Infrared Low-and High-Order Harmonic Generation in GaAs/AlGaAs Quantum Wells.

Abstract

We have used the UCSB Free-Electron Lasers to study nonlinear and nonequilibrium intersubband dynamics in GaAs/AlGaAs semiconductor heterostructures at Terahertz frequencies. We have observed extremely large voltage-tunable resonant optical nonlinearities in quantum wells, which can be successfully modeled by self-consistent theory which includes the electron-electron interactions. We have performed definitive measurements of the intersubband relaxation time for quantum wells with energy level spacings below the LO phonon energy. Finally, we have observed the collective intersubband absorption in a quantum well to shift from its 'dressed' energy towards its undressed energy on excitation with intense Terahertz radiation. jg p1

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Document Details

Document Type
Technical Report
Publication Date
Oct 04, 1995
Accession Number
ADA303913

Entities

People

  • Mark Sherwin

Organizations

  • University of California, Santa Barbara

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Dynamics
  • Electron Electron Interactions
  • Electrons
  • Energy Levels
  • Far Infrared Radiation
  • Free Electron Lasers
  • Free Electrons
  • Frequency
  • Heterojunctions
  • Lasers
  • Materials Science
  • Quantum Wells
  • Radiation
  • Relaxation Time
  • Semiconductors
  • Terahertz Radiation

Fields of Study

  • Materials science

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Directed Energy
  • Microelectronics
  • Quantum Computing
  • Space