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We show that the electric field driven surface instability of visco-elasticfilms has two distinct regimes: (1) The visco-elastic films behaving like aliquid display long wavelengths governed by applied voltage and surfacetension, independent of its elastic storage and viscous loss moduli, and (2)the films behaving like a solid require a threshold voltage for the instabilitywhose wavelength always scales as ~ 4 x film thickness, independent of itssurface tension, applied voltage, loss and storage moduli. Wavelength in anarrow transition zone between these regimes depends on the storage modulus.

Electric field Induced Patterns in Soft Visco-elastic films: From Long Waves of Viscous Liquids to Short Waves of Elastic Solids