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Abstract
The dynamic scattering mode (DSM) in nematic liquid crystals of negative dielectric anisotropy has been the subject of extensive fundamental and applied research, but almost all of these experiments have been performed in the visible spectral domain. In this wavelength range, when an increasing voltage (dc or low frequency ac) exceeding a threshold below 10 V is applied to a nematic thin layer held between two transparent electrodes, the incident light is scattered due to electrohydrodynamic instabilities, and the cell transmission decreases rapidly towards a low value (a few percent); this latter then remains constant, even if the applied voltage is high (80 V, for example).