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We study collisionless absorption of short laser pulses of various intensity,wavelength ($\lambda$) and polarization in a deuterium cluster using moleculardynamics (MD) simulation. For a given laser energy and a pulse duration$\approx$ 5-fs (fwhm), it is found that maximum laser absorption does nothappen at the welknown static Mie-resonance or linear resonance (LR) wavelengthof $\lambdaM\approx 263$~nm (for deuterium cluster) irrespective of linearpolarization (LP) and circular polarization (CP) state of laser. As the laserintensity increases, the absorption peak is gradually red-shifted to a higher$\lambda$ in the marginally over-dense regime of $\lambda\!\! \approx\!\!(1\!\!-\!\!1.5)\lambdaM$ from the expected static~$\lambdaM$ owing togradual outer ionization and cluster expansion; and above an intensity theresonance absorption peak disappears (sometimes followed by {\em even} a growthof absorption) when outer ionization saturates at 100\% for both LP and CP.This disappearance of the resonance absorption peak should not bemisinterpreted as the negligible (or no) role of Mie-resonance. In fact, inthis marginally over-dense band of $\lambda\!\! \approx\!\!(1\!\!-\!\!1.5)\lambdaM$, some electrons undergo dynamic Mie-resonance(dynamic LR) and others anharmonic resonance when they are freed. It is alsofound that before the absorption peak, laser absorption due to LP and CP lasersare almost equally efficient (CP case being inappreciably higher than LP) forall intensities and $\lambda$. However, after the absorption peak, at lowerintensities, absorption due to LP inappreciably dominates absorption due to CPwith increasing~$\lambda$ which gradually reverses at higher intensities. MDresults are also supported by a naive rigid sphere model of cluster.

Collisionless absorption of short laser pulses in a deuterium cluster:  dependence of redshift of resonance absorption peak on laser polarization,  intensity and wavelength