Gamaly, Eugene GJuodkazis, SauliusMisawa, HiroakiLuther-Davies, BarryRode, Andrei VHallo, LudovicNicolai, PhilippeTikhonchuk, Vladimir T2015-12-081567-1739http://hdl.handle.net/1885/33398Formation of three-dimensional (3D) patterns of 0.2-0.5 μm diameter voids inside a transparent solid has been demonstrated. The nano-voids could be created with a spacing ∼2 μm thus suggesting the possibility of permanent 3D optical memory with densitKeywords: Electric breakdown; Hydrodynamics; Microfabrication; Optical data storage; Sapphire; Shock waves; Ultrashort pulses; Femtosecond laser microfabrication; Nano-voids; Nanostructuring; Plasma hydrodynamics; Dielectric materials Dielectric breakdown; Femtosecond laser microfabrication; Nano-structuring; Sapphire; Shock waves200810.1016/j.cap.2007.10.0712015-12-08