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  • Featured in Physics
  • Open Access
  • Access by Xinjiang University

Holography of Wi-fi Radiation

Philipp M. Holl* and Friedemann Reinhard†

  • Technische Universität München, Walter Schottky Institut and Physik Department, Am Coulombwall 4, 85748 Garching, Germany

  • *Corresponding author. Philipp.Holl@wsi.tum.de
  • †Friedemann.Reinhard@wsi.tum.de
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Phys. Rev. Lett. 118, 183901 – Published 5 May, 2017

DOI: https://doi.org/10.1103/PhysRevLett.118.183901

Abstract

Wireless data transmission systems such as wi-fi or Bluetooth emit coherent light—electromagnetic waves with a precisely known amplitude and phase. Propagating in space, this radiation forms a hologram—a two-dimensional wave front encoding a three-dimensional view of all objects traversed by the light beam. Here we demonstrate a scheme to record this hologram in a phase-coherent fashion across a meter-sized imaging region. We recover three-dimensional views of objects and emitters by feeding the resulting data into digital reconstruction algorithms. Employing a digital implementation of dark-field propagation to suppress multipath reflection, we significantly enhance the quality of the resulting images. We numerically simulate the hologram of a 10-m-sized building, finding that both localization of emitters and 3D tomography of absorptive objects could be feasible by this technique.

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Physics Subject Headings (PhySH)

Focus

Imaging with Your Wi-Fi Hotspot

Published 5 May, 2017

The Wi-Fi signals that provide internet access can also produce images of the transmitter’s 3D surroundings, even through walls.

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Supplemental Material

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Phys. Rev. Lett. 118, 183901– Published 5 May, 2017
  • Received 25 September 2016
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Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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