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A comparative experimental and theoretical investigation is presented thatcentres on the effects of structuring black silicon surfaces with linearly,circularly and azimuthally polarized laser pulses under SF6 ambient atmosphere.It is shown that the asymmetric elliptical micro-cone formations induced bylinearly polarized beams result in variable light absorption due to theirspatial asymmetry. By contrast, the use of azimuthally polarized beams leads toan omni-directionality of the elliptical cone orientation which is dependent onthe local electric field during laser scanning. The locally variant electricfield state that is azimuthally polarized leads to a selective conicalorientation for the induced structures. The omni-directional conicaldistribution induced by azimuthal polarization produces similar,angle-independent absorption in the visible spectrum with the symmetricalconical structures that could only be realized with circularly polarized beams.

Polarization dependent spike formation on black silicon via ultrafast laser structuring