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@@ -631,8 +631,6 @@ license.
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resulting assymetry becomes smallar and the synced with the period of
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incident light variation of $G_{N_e}$ decreases.
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- %A bookmark by Kostya
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-
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Higher excitation conditions are followed with large values of
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electric field amplitude, which lead to apperance of high EHP
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densities causing a significant change of optical properties of
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@@ -660,7 +658,7 @@ license.
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this finishes spilling the NP`s volume with plasma reducing the
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asymmetry, see Fig.~\ref{plasma-grid}(d).
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- For $R=100$~nm the evolution to during the final stage goes in a
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+ For $R=100$~nm the evolution during the final stage goes in a
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similar way, with a notable exception regarding MD resonance. As
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soon as presence of EHP incresases the absorption, it suppresses the
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MD resonance with symmetric filed pattern, thus, the asymmetry factor
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@@ -669,18 +667,22 @@ license.
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mark.
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The last NP with $R=115$~nm shows the most complex behavior during
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- the Stage~4.
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-
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- as a result, the we observe the forward shifting of
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- EHP density maximum. Therefore, EHP is localized in the front part of
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- the NP, influencing the asymmetry factor $G_{N_e}$ in
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- Fig.~\ref{time-evolution}. Approximately at the pulse peak, the
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- critical electron density $N_{cr} = 5\cdot{10}^{21}$~cm$^{-3}$ for
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- silicon, which corresponds to the transition to quasi-metallic state
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- $Re(\epsilon) \approx 0$ and to the electron plasma resonance, is
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- overcome. Further irradiation leads to a decrease in the asymmetry
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- parameter down to $G_{N_e} = 0$ for higher EHP densities, as one can
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- observe in Fig.~\ref{plasma-grid}(d, h, l).
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+ the Stage~4. The superposition of Mie field pattern with the one from
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+ Stage~1 results into the presence of two EHP spatial maxima, back and
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+ front shifted. They serve to be a starting seed for EHP formation,
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+ the interplay between them forms a complex behavior of the assymetry
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+ factor curve. Namely, it changes the sign from negative to positive
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+ and back during the last stage. This numerical result can hardly be
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+ explained in a simple qualitative manner, it is too complex to
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+ account all near-field interaction of incident light with two EHP
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+ regions inside a single NP. However, it is intersing to note, that in
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+ a similar way as it was for $R=100$~nm the increased absorption
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+ should ruin ED and MD resonances, responsible for the back-shifted
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+ EHP. As soon as this EHP region is quite visible on the last snapshot
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+ in Fig.~\ref{plasma-grid}(l), this means that EHP seeds are
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+ self-supporting.
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+
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+ %A bookmark by Kostya
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As the EHP acquires quasi-metallic properties at stronger excitation
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$N_e > 5\cdot{10}^{21}$~cm$^{-3}$, the EHP distribution evolves
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