Microdroplet Actuation via Light Line Optoelectrowetting (LL-OEW)

Figure 7

Calculated 3D color-plot of the contact angle change Δθ for variable supply voltage (V) and variable modulation frequency ν. The values of the calculated contact angle change Δθ are given in the third dimension, but are also color-coded (see color scale on the right). The other parameters are very similar to those from the situation for Figure 6: (i) droplet's area above the electrode (projected on the electrode): A ≈ 3.14 10⁻⁶m² with an illuminated fraction of 10%; (ii) surface energy of the liquid droplet in ambient/air: γ_la ≈ 0.07 N/m; (iii) Ohmic path resistance beyond double-layer: R_Path = 5.0 MΩ; (iv) Ohmic resistance of photoconductive a-Si :H layer without illumination: 12 MΩ; (v) Ohmic resistance of photoconductive a-Si :H layer with illumination: 0.12 MΩ.