Quantum Optoelectronics

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MEASUREMENTS OF HOT CARRIER RELAXATION AND RECOMBINATION IN GaAs QUANTUM WELLS BY PICOSECOND OPTICAL PROBING.

IEE Colloquium (Digest) (1984)

Authors:

JF Ryan, RA Taylor, AJ Turberfield

Abstract:

In this paper the authors show how picosecond time-resolved photoluminescence can be used to probe the energy relaxation of hot carriers in semiconductor structures. In addition, by measuring the variation of luminescence lifetime with carrier density one can obtain information about radiative and nonradiative decay processes. These processes are important in all photonic devices, but especially so in structures where interfaces may have a particularly strong influence.

Time-resolved photoluminescence of two-dimensional hot carriers in GaAs-AlGaAs heterostructures

Physical Review Letters 53:19 (1984) 1841-1844

Authors:

JF Ryan, RA Taylor, AJ Turberfield, A Maciel, JM Worlock, AC Gossard, W Wiegmann

Abstract:

We have studied the picosecond time dependence of luminescence from a two-dimensional electron system following absorption of an ultrashort light pulse. From our measurements we determine the temporal evolution of the carrier temperature, finding that the cooling of hot carriers is suppressed by a factor 60 below that predicted on a three-dimensional nondegenerate-electron model. Additionally, we determine the electron-hole radiative life-time and invoke a hole trap to explain shortened luminescence lifetimes at low carrier densities. © 1984 The American Physical Society.
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TIME-RESOLVED PHOTOLUMINESCENCE OF TWO-DIMENSIONAL HOT CARRIERS IN GAAS-ALGAAS HETEROSTRUCTURES

PHYSICAL REVIEW LETTERS 53:19 (1984) 1841-1844

Authors:

JF RYAN, RA TAYLOR, AJ TURBERFIELD, A MACIEL, JM WORLOCK, AC GOSSARD, W WIEGMANN
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Picosecond studies of luminescence of cis polyacetylene

Journal of Physics C: Solid State Physics 16:20 (1983)

Authors:

W Hayes, CN Ironside, JF Ryan, RP Steele, RA Taylor

Abstract:

The authors find that the lifetime of the 1.9 eV luminescence of cis-polyacetylene is
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Observations of magnetic domain structures in thick foils of Ni-Fe-Co-Ti alloy

Journal of Magnetism and Magnetic Materials 31-34:PART 2 (1983) 1001-1004

Authors:

RA Taylor, JP Jakubovics

Abstract:

The domain structure of thick foils of a 33.8Ni-51.0Fe-14.0Co-1.2Ti (wt%) alloy has been studied by high voltage transmission Lorentz microscopy. Complex domain structures and wall images have been observed. Periodic domain structures have been interpreted as sets of two-dimensional vortex walls. © 1983.
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