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It is important to point out that the observed sharp drop reaching a minimum (state filling) is pulse width limited, which is expected since we are probing the same energy states that we are exciting.
This is further supported by the sharp rise (pulse width limited) to a maximum PA signal seen for probing photon energies smaller than 2.25 eV, suggesting that once the carriers are generated they provide PA signal.
At first sight, the behavior appears to be similar for all probing wavelengths; that is, there seems to be a fast decrease (pulse width limited) in optical absorption reaching a minimum, followed by a fast recovery toward a plateau within 5 to 10 ps, and then returning back to its equilibrium value over several nanoseconds.
This pulse width limited fast drop suggests that the exciton relaxation within the valence and conduction bands of polymer is beyond our time resolution.
Here our task is the investigation of light transmission along the length of a perfected PC slab with a width limited by a high-dielectric-constant material at boundaries.
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For both probing regions there is an initial sharp change which is pulse-width limited reaching a maximum value, and then followed by a slow recovery toward equilibrium which persists over tens of picoseconds.
From these data, it is obvious that when we probe at resonant with the singlet exciton transition (600 nm) we observe a pulse-width limited drop of absorption which is attributed to state filling by the Coulomb-correlated electron hole pairs at the particular probing energy state.
It is well-known that in this system exciton dissociation happens within a few fs whereas the resolution of our system is pulse-width limited (~150 fs) and therefore our measurements at 0 ps time are possibly affected by charged carriers generated from exciton dissociation.
For the shortest probing wavelengths, we observe a pulse width-limited, sharp decrease in the induced absorption followed by a recovery toward equilibrium over a time scale of hundreds of ps.
With road-width limited, the last place any competitor will wish to find himself is in that long line of forlorn riders snaked out in single file behind the main group, hanging on for grim death just to stay in touch with the wheel in front.
This suggests that we are probing states that are much different than those we are probing with the shorter wavelengths where the maximum signal appears to be instantaneous (pulse-width limited).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com