  We experimentally demonstrate fabrication of tunable high contrast periodic
fishnet metasurfaces with 3 um period on 200 nm thick Ge2Sb2Te5 films sputted
onto glass and sapphire substrates using direct laser writing technique. We
find that the use of sapphire substrate provides better accuracy of metasurface
segments due to high thermal conductivity. The advantages of the demonstrated
method consist in its simplicity, rapidity, robustness, and the ability of
tuning of fabricated structures. This is of crucial importance for the creation
of robust and tunable metasurfaces for applications in the field of
telecommunications and information processing.
