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Photorefractive organic material for optical thresholding
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) The two possible director orientations in a surface stabilized ferroelectric liquid crystal. is the spontaneous polarization, is the director, and is the tilt angle between the director and the normal to the layers. (b) Driving scheme used to control polarization switching in doped samples. A sequence of alternating positive and negative pulses is used in order to minimize charge accumulation at the electrodes. (c) Schematic representation of the experimental setup. The SSFLC device is exposed to the interference pattern of two laser beams while simultaneously applying the electric field sequence shown in (b). Along the interference pattern, the resulting space-charge field, together with , controls the polarization switching, which occurs only in the regions where the total field is higher than the threshold. For clarity, the dimensions of the layers are out of scale.

Image of FIG. 2.
FIG. 2.

[(a) and (b)] Optical microscope pictures of a thick sample of doped L-15278, placed between crossed polarizers after the writing process (, , and ). in case (a) and in case (b). The period of the interference pattern was . (c) Schematic illustration of the director orientations in the exposed region after the writing process. and indicate the director orientations in the bright and dark regions, respectively.

Image of FIG. 3.
FIG. 3.

First order diffraction efficiency as a function of with , , and for two different illumination conditions ( and ).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photorefractive organic material for optical thresholding