The reflection spectrum of the cholesteric Grandjean texture has been obtained as a function of mechanical shear. Data are explained in terms of a layered structure consisting of tilted and untilted helical Grandjean texture and a dynamic focalhyphen;conic texture for shear rates less than 103secminus;1. The correlated helical structure is shown to tilt under applied shear with little distortion. At shear rates greater than 103secminus;1, homeotropic texture is generated. A theoretical model is proposed which explains observed spectral intensity and wavelength data.
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