Holography of Wi-fi Radiation

Physical Review Letters
Philipp M Holl, Friedemann Reinhard

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.

References

Jul 29, 1996·Physical Review Letters·M MorinagaS Matsui
Dec 6, 2001·Nature·B SurJ Katsaras
May 15, 1948·Nature·D GABOR

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Citations

Oct 28, 2019·Light, Science & Applications·Lianlin LiTie Jun Cui
Apr 21, 2019·Plant Science : an International Journal of Experimental Plant Biology·Thomas RoitschEric S Ober

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