Ground-state exciton emission of In As quantum dots produced by focused-ion-beam-directed nucleation

Joanna Millunchick

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joannamm@umich.edu

2014 HH Dow

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J. Lee, T. W Saucer, A. J Martin, D. Tien, J. M Millunchick, and V. Sih (2013)

JOURNAL OF LUMINESCENCE, 133:117-120.

We report on scanning micro-photoluminescence measurements on InAsquantum dots that were patterned using an in vacuo focused ion beam. Thefocused ion beam produced a square array of holes with an array spacingof 2 gm, upon which multiple layers of InAs and GaAs were deposited.Two-dimensional mapping of the luminescence spatially and spectrallyresolves the emission from individual dots. At some positions, multipleemission peaks are observed, which could have originated from (i)different exciton transitions of the same quantum dot, or (ii) differentquantum dots. Power dependence measurements reveal that the emissionincreases linearly with power, and maps of the emission show that thepositions of each peak are spatially separated, suggesting that thepeaks are ground-state exciton emission from different dots. (c) 2011Elsevier B.V. All rights reserved.

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