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The swift excitation of the transparent dielectrics by intense short laserpulse produces ultra-fast re-structuring of the electronic landscape generatinga wealth of material states continuously changing in space and in time inaccord with the variations of the intensity. These unconventional transientmaterial states combine simultaneously dielectric and metal properties(Die-Met). The laser excitation transforms a transparent dielectric intoelectrically inhomogeneous state early in the pulse time [1]. The permittivityof excited material varies in time and in space changing from positive tonegative values that strongly affects the interaction process.  The interplay between the transient permittivity gradient and polarisation ofthe incident laser becomes the major process of the new interaction mode. In aparticular relation between the polarization and the permittivity gradient theincident field amplitude grows up while the wave is approaching to the surfacewhere the real part of permittivity turns to zero. That results in the localincrease in the absorbed energy density. The complex 3D structure of thepermittivity makes a transparent part of excited dielectric (at ${\epsilon}0 >{\epsilon}re > 0$) optically active. The electro-magnetic wave passing throughsuch a medium gets a twisted trajectory and accrues the geometric phase [2].The plane of polarisation rotation and phase depends on the 3D permittivitystructure [3]. Measuring the polarisation and phase of the probe beam allowsquantitatively identify this new transient state. We discuss the revelations ofthis effect in different experimental situations and possible applications.

Ultra-fast re-structuring the electronic landscape of transparent dielectrics: new material states (Die-Met)