Figure 4: Fluorescence intensity and feature size of the field-induced fluorescent patterns.

(a) Cyclic electric fields applied to the EMCR film and (b) the corresponding fluorescence intensity. The green shadow domains indicate that the EMCR film is under green light (~545 nm) for 3 min. (c) Crater wavelengths and internal diameters of the fluorescent rings as a function of the thickness of the buffer substrate. (d) Fluorescence intensity and (e) calculated first invariant of the EMCR film along a radial path of the fluorescent ring. (f) The maximum first invariant in EMCR film as a function of applied electric field. The critical electric field for wrinkling instability is E₀=33.5 kV mm⁻¹.