0000000000146905

AUTHOR

J. O. White

showing 2 related works from this author

Cooling of Hot Electrons in Amorphous Silicon

1997

ABSTRACTMeasurements of the cooling rate of hot carriers in amorphous silicon are made with a two-pump, one-probe technique. The experiment is simulated with a rate-equation model describing the energy transfer between a population of hot carriers and the lattice. An energy transfer rate proportional to the temperature difference is found to be consistent with the experimental data while an energy transfer independent of the temperature difference is not. This contrasts with the situation in crystalline silicon. The measured cooling rates are sufficient to explain the difficulty in observing avalanche effects in amorphous silicon.

Amorphous siliconeducation.field_of_studyMaterials scienceCondensed matter physicsSiliconPopulationNanocrystalline siliconchemistry.chemical_elementElectronchemistry.chemical_compoundCrystallographychemistryLattice (order)Charge carrierCrystalline siliconeducationMRS Proceedings
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Enhanced diffraction of light in GaAs microcavities

1995

We theoretically analyze the diffraction of light by gratings that are photogenerated in Fabry–Perot microcavities. The coupled-wave theory of volume gratings is combined with appropriate boundary conditions to yield expressions for the diffraction efficiency. Multiple round trips within the cavity are seen to increase the effective grating thickness and therefore the efficiency. Numerical calculations specific to GaAs microcavities show that the diffraction efficiency can be enhanced by more than 2 orders of magnitude at the resonant wavelengths.

DiffractionMaterials sciencebusiness.industryOrders of magnitude (temperature)Physics::OpticsStatistical and Nonlinear PhysicsGratingDiffraction efficiencyAtomic and Molecular Physics and OpticsWavelengthOpticsAttenuation coefficientOptoelectronicsReflection coefficientbusinessDiffraction gratingJournal of the Optical Society of America B
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