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Plan-view confocal PL maps of an isolated dislocation in GaAs over a wide range of photoexcitation intensities Iex . (Iex values do not include reflection loss.) Greyscale values are estimates of radiative efficiency—the ratio of photons emitted to photons absorbed.
Radial profiles of the PL contrast maps shown in Figs. 1 and 2 .
(a) Detailed PL contrast profiles of the lowest excitation maps after laser modification. Note the clear change from single to double exponential behavior as the excitation intensity is reduced. (b) Effective diffusion lengths before and after modification derived from the exponential fits shown in Figs. 3 and (a). Note that the double exponential fit in (a) produces 2 effective lengths for the lowest excitation post-modification result.
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