Fabrication and Properties of High-Performance Graded Quantum Structures

Abstract

In this reporting period, we have extended this work by creating vertical transport structures to allow for resonant injection into the higher levels of a parabolic quantum well to improve the efficiency and intensity of Terahertz emission. Measurements showed the clear presence of coherence and resonant tunneling behavior for wells as wide as 1000 A. Then, vertically injected Terahertz emission devices were made with multiple cascaded PQWs (30 to 10 wells) sandwiched between n+ contact layers. The initial results from these devices has shown a factor of 4 improvement in emission power over the in-plane excitation devices described above. The current power level of 30 nW for these devices is comparable to the state of the art for other techniques of Terahertz generation at these frequencies.

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Document Details

Document Type
Technical Report
Publication Date
Jul 30, 1997
Accession Number
ADA329745

Entities

People

  • Gossard

Organizations

  • University of California, Santa Barbara

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Band Gaps
  • Demographic Cohorts
  • Detectors
  • Electromagnetic Spectra
  • Emission
  • Environmental Monitoring
  • Excitation
  • Frequency
  • Measurement
  • Power Levels
  • Quantum Tunneling
  • Quantum Wells
  • Radiation
  • Resonant Tunneling Diodes
  • Terahertz Radiation
  • Tunnel Diodes
  • Tunneling

Fields of Study

  • Materials science

Readers

  • Electronics Engineering
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

  • Quantum Computing