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The SPP mode and guided waves at the top-boundary area of a HAN cell. The inset is a HLGM-HAN-LC cell with a metal tunnel barrier.
(a) The model results of the reflectivity in the SPP mode area for two different tilt angle profiles, which are shown in the inset. The parameters for the modeling are , for the top glass plate , for thin silver film with thickness , for the layer with thickness , for LC and with a thickness and at the top and at the bottom, through the cell, for the bottom glass plate , for the ITO coating with thickness . The very thin lecithin layer can be ignored as far as its optical effect is concerned. (b) The optical -field distribution at the incident angle .
The whole incident angle range of the reflectivity data (circles) and fitting result (solid line) for no voltage applied. The inset is the detail of fitting results and experimental data in the TM-type guided mode region. The parameters of the sample geometry from the fit are: silver film , ; LC (E7) , , with twist angle (out-of-plane geometry); and ITO are same as in Figure 2(a).
The reflectivity data (circles) and model fit (solid) at . The dotted line is the model coupling spectrum for the tilt angle distribution shown in the inset by the dash-dotted line. The inset is the detail of the tilt angle distributions near the upper boundary. The solid line and dotted lines are for applied voltage of 1.00 and , respectively, while the dash-dotted line is an imaginary profile with the surface tilt angle set at 86°.
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