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Switchable selective backscatter modulation via the Kerker effect
K. J. Cowan, C. M. Hooper, C. P. Gallagher, S. J. Berry, A. P. Hibbins, A. W. Powell
https://arxiv.org/abs/2607.18900 https://arxiv.org/pdf/2607.18900 https://arxiv.org/html/2607.18900
arXiv:2607.18900v1 Announce Type: new
Abstract: We design a reflective scatterer that operates only in the backscatter direction using modulation of the Kerker effect. This being a phenomena where the resonant modes of a scattering object produce total destructive interference in the backscatter direction. Our design consists of a dielectric shell and an interior metal element that provide the required dipolar contributions for Kerker interference with angular stability. By incorporating a PIN diode, we obtain a scatterer that exhibits strong amplitude modulation in the backscattering direction that is weaker at other bistatic angles. Backscatter modulation is a key technology to connect everyday objects but can be vulnerable to eavesdropping, the device presented in this work may help guard against such flaws.
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