Abstract
Vanishing of the forward as well as the backward-scattered laser light from a dispersion of micron sized magnetic particles in a ferrofluid is observed at a certain critical magnetic field ${H}_{\mathrm{c}}$. Upon increasing the field the forward-scattered intensity remains zero but the backward-scattered intensity enhances by a large amount. The transmitted intensity remains zero up to a certain field value and exhibits a stop band of field similar to a stop band of frequencies observed in other photonic materials. Results are discussed in light of existing theories. The remarkable simplicity of tuning the effects will be useful to develop photonic devices.
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