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arXiv · 1108.3498

Subwavelength position sensing using nonlinear feedback and wave chaos

Seth D. Cohen·Hugo L. D. de S. Cavalcante·Daniel J. Gauthier
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Abstract

We demonstrate a position-sensing technique that relies on the inherent sensitivity of chaos, where we illuminate a subwavelength object with a complex structured radio-frequency field generated using wave chaos and a nonlinear feedback loop. We operate the system in a quasi-periodic state and analyze changes in the frequency content of the scalar voltage signal in the feedback loop. This allows us to extract the object's position with a one-dimensional resolution of ~λ/10,000 and a two-dimensional resolution of ~λ/300, where λ is the shortest wavelength of the illuminating source.

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Seth D. Cohen, Hugo L. D. de S. Cavalcante, Daniel J. Gauthier. 2011-08-17. Subwavelength position sensing using nonlinear feedback and wave chaos. https://doi.org/10.1103/physrevlett.107.254103

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