(a) Sample cell design consisting of two pieces of ITO coated glass separated by a combination of glass spacers (dark gray) and NOA65 optical adhesive (light gray). Two basic cell configurations were studied: type 1 consists of spacers embedded only within the epoxy, while type 2 consists of spacers embedded outside the epoxy. (b) Setup for ac and dc tuning experiments where the transmission spectra could be measured during the application of the voltage. (c) Diagram of the interferometry experiment with interferograms at various voltages.
The tuning spectra for CLCs with (a) 19.3% and (b) 8% of S811 by weight and elvamide as the alignment layer. (c) The dc voltage dependence of the notch depth and position for the 8% S811 sample. (d) The dependence of the maximum observed tuning range as a function of the initial notch location for samples using cell type 1 with polyimide alignment layers and cell gaps of approximately .
Normalized capacitance measurements made on cholesteric cells of (a) type 1 and (b) type 2 described in Fig. 1(a). The discrete behavior seen in the capacitance results is due to digitizing error from the capacitance meter.
Comparisons of the relative change in the notch position (circles) and the inverse change in cell capacitance (squares) for a (a) type 1 and (b) type 2 cell. The discrete behavior seen in the capacitance results is due to digitizing error of the capacitance meter.
The results of changing the substrate glass thickness on the relative tuning behavior of a CLC.
(a) Time dependence of the notch position as pressure is applied and released from a type 1 cell under a small dc bias of . (b) Using patterned ITO substrates and plastic spacers, the deformation of the glass substrate can be controlled to both red and blue tune the aligned cholesteric sample.
(a) The 1D simulated dependence of the normalized gap at the center of the cell as a function of the normalized voltage. (b) Comparisons of the simulated spatial distribution of the normalized gap for compared with experimental results of the spatial distribution of tuning range change at different positions within the cell.
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