DIRE—the dye-induced reorientation effect—occurs when the optical-field-induced reorientation of liquid crystals (LCs) is enhanced by dyes such as the thiophene-based oligomer TR5 shown in the Figure. The synthesis of TR5 is described and its DIRE characterized. It is shown that TR5 provides a new way of controlling LC alignment using low-intensity light (see also cover).
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Zhang et al. (2000) studied this question.