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Structure of highly stacked InAs quantum dots.
Transmission change measurement as function of pump-probe time delay. The inset is an expanded trace around time delay at zero. Optical pulse energy and central wavelength are set to and .
PL spectrum (dotted line in the upper figure), maximum transmission change (filled circle in the upper figure), and transmittance (lower figure).
Intensity dependence of transmittance of stacked InAs quantum dots. Excitation wavelength is . The open squares and solid line are experimental results and fitted curve, respectively. (a) is for the sample with thick substrate and (b) is for the sample with substrate and antireflection coating. The inset of (a) is the transmittance of InP (311)B substrate without dot layer.
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