Spatiotemporal modulation for non-reciprocal radiation and scattering

Yakir Hadad, Jason C. Soric, Dimitrios L. Sounas, Andrea Alu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Lorentz reciprocity imposes constraints on radiation and scattering. For instance, a reciprocal antenna in a reciprocal medium will have identical radiation patterns in transmission and reception; therefore, in a dense environment a directive antenna will be prone to 'hear' its own echoes. Likewise, a scattering matrix in reciprocal medium will be symmetric, implying particularly that a metasurface that reflects plane wave A to plane wave B will necessarily do the reciprocal process, from B to A, with identical efficiency. Recent works have shown that weak spatiotemporal modulation in high-Q ring resonators can create drastic non-reciprocity. Here we show theoretically and experimentally that, by proper design, taking advantage of the light-cone filtering property, spatiotemporal modulation of low-Q radiating and scattering systems, can exhibit also significant non-reciprocity. Possible applications are in radio-frequency communication systems, as well as open new directions in nanophotonics, energy harvesting, and thermal management, when translated to different frequency regimes.

Original languageEnglish
Title of host publication2016 10th European Conference on Antennas and Propagation, EuCAP 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9788890701863
StatePublished - 31 May 2016
Externally publishedYes
Event10th European Conference on Antennas and Propagation, EuCAP 2016 - Davos, Switzerland
Duration: 10 Apr 201615 Apr 2016

Publication series

Name2016 10th European Conference on Antennas and Propagation, EuCAP 2016


Conference10th European Conference on Antennas and Propagation, EuCAP 2016


FundersFunder number
National Science FoundationECCS-1406235
Office of Naval ResearchN00014-15-1-2685
Air Force Office of Scientific ResearchFA9550-14-1-0105, FA9550-13-1-0204
Defense Threat Reduction AgencyHDTRA1-12-1-0022
Grainger Foundation2014-007/2000005584


    • antenna
    • reciprocity
    • time-modulation


    Dive into the research topics of 'Spatiotemporal modulation for non-reciprocal radiation and scattering'. Together they form a unique fingerprint.

    Cite this