Subwavelength position sensing using nonlinear feedback and wave chaos

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.

4 pages, 4 figures

References in corpus (2)

• Complex Dynamics and Synchronization of Delayed-Feedback Nonlinear Oscillators
• Sensing Small Changes in a Wave Chaotic Scattering System

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