2D Scanning by Subwavelength Superoscillatory Focused Beams for Wireless Power Delivery

Miniature implantable medical neurostimulation devices offer new therapy options to patients with otherwise untreatable neurological or psychiatric disorders. However, powering such devices, which may be implanted deep in the brain, remains a major challenge. We demonstrate an energy focusing approach for wireless power transmission purposes, envisioned to be deployed in wearable head-mounted devices. A 2D focusing technique is introduced within a A× λ─size cavity at 1 GHz that utilizes the principle of superoscillations. This mode of power transmission enables reaching deep inside the cavity while allowing for arbitrarily steering of the focal point. Through meticulous analysis, the 2D-focused waveform's full width at the half-maximum (FWHM) is determined as 0.38λ.