Biomedical Engineering Reference
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Fig. 11.9 Comparison of the power dependence of F o at two different applied field. This is
accomplished by monitoring the 1 0 1 X 0 state and the 1 1 1 X + state simultaneously
Fig. 11.10 Schematic representation of the quasi-pump probe setup. A modulated (250 Hz) diode
pumped solid states (DPSS) laser is used to generate the optical field while a CW laser is used to
probe and monitor the indirect exciton
extinction of the optically generated electric field we were able to determine the
decay rate ofthe optically generated electric field within the device.
To determine the dynamics of the optically created field, time-resolved measure-
ments were performed in which the position of the interdot line was monitored
relative to a modulated excitation laser. A diode pumped solid-state (DPSS) laser
with energy above the WL (532 nm), modulated at 250 Hz, was used to create
the optically generated field (Fig. 11.10 ). However, due to the relatively short PL
lifetime of the exciton states in QDMs, typically on the order of nanoseconds,
we cannot use the interdot PL generated by the 532 nm excitation to monitor the
temporal behavior of F o . To be able to continue to observe the interdot exciton PL
we used the CW Ti:Sapphire laser with energy below the WL, around 920 nm, such
 
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