PHONON INTERACTIONS IN CRYSTALS.

Abstract

The amplification of microwave phonons in germanium has been observed. Gains as large as 20 db at 9 Gc/sec have been observed. This type of amplifier is the first for which substantial gains have been reported at such high frequencies. The deformation potential interaction is responsible for transferring energy from the electronic current to the hypersonic wave. Because of the multivalley nature of the conduction bands of germanium, space charge repulsion is not as effective in debunching the electrons (and hence in reducing their interaction with the hypersonic wave) as it is for materials having a piezoelectric interaction. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 14, 1964
Accession Number
AD0451235

Entities

People

  • A. H. Nethercot
  • M. Pomerantz
  • N. S. Shiren

Organizations

  • IBM Thomas J. Watson Research Center

Tags

DTIC Thesaurus Topics

  • Absorbers (Materials)
  • Advanced Materials
  • Amplification
  • Amplifiers
  • Conduction Bands
  • Electrons
  • Energy Bands
  • Engineered Materials
  • Frequency
  • Frequency Shift
  • Germanium
  • Hypersonic Waves
  • Materials
  • Microwaves
  • Space Charge
  • Waves

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Plasma Physics / Magnetohydrodynamics
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Boundary Layers
  • Hypersonics - Hypersonic Flight
  • Hypersonics - Hypersonic Flow
  • Microelectronics
  • Microelectronics - Graphene
  • Space