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Experimental setups: (a) irradiation setup and (b) retardation spectrum measurement setup.
(a) ×70 000 SEM micrograph of a typical nonirradiated chalcogenide thin film prepared for this study having 20 nm thickness. [(b)–(d)] ×10 microscope images of the LC device oriented at 45° between two cross polarizers: (b) shows the transition between irradiated and nonirradiated areas; (c) irradiated area alone; (d) nonirradiated area alone. [(e) and (f)] ×10 microscope images of LC device oriented at extinction position between two crossed polarizers in irradiated (e) and in nonirradiated (f) areas.
(a) Normalized transmission spectra at different voltages between crossed polarizers at 45° azimuthal orientation. (b) LC cell response near the Frederick’s threshold at 521 nm. The solid line is showing measurement results, and the dashed line is a linear fit plot to determine the threshold voltage by extrapolation.
Images of the interferogram when a square wave voltage of 0 and 1.65 V was applied with the LC was orientated such that the photoaligning light polarization was perpendicular [(a) and (b)] and parallel [(c) and (d)] to the polarizer. The dashed white lines are to guide the eye showing that there is no phase shift between (a) and (b) while there is nearly quarter fringe shift between (c) and (d). This confirms that the LC molecules are orientated along the photoaligning polarization direction.
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