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Cross-sectional TEM images of 16-fold columnar QDs with InAs supply amount of (a) 2.0 ML and (b) 2.5 ML.
Polarized PL spectra of 16-fold columnar QDs with varying InAs supply amount.
Cross-sectional TEM images of 13-fold columnar QDs with preflow of (a) 1 s and (b) 60 s. Dislocation was labeled as .
Polarized PL spectra of 13-fold columnar QDs with varying preflow time.
Material gain of columnar-QD SOAs with varying barrier thicknesses.
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