Asymmetric phase modulation of light with parity-symmetry broken metasurfaces

Elena Mikheeva, Rémi Colom, Karim Achouri, Adam Overvig, Felix Binkowski, Jean Yves Duboz, Sébastien Cueff, Shanhui Fan, Sven Burger, Andrea Alù, Patrice Genevet

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The design of wavefront-shaping devices is conventionally approached using real-frequency modeling. However, since these devices interact with light through radiative channels, they are by default non-Hermitian objects having complex eigenvalues (poles and zeros) that are marked by phase singularities in a complex frequency plane. Here, by using temporal coupled mode theory, we derive analytical expressions allowing to predict the location of these phase singularities in a complex plane and as a result, allowing to control the induced phase modulation of light. In particular, we show that spatial inversion symmetry breaking—implemented herein by controlling the coupling efficiency between input and output radiative channels of two-port components called metasurfaces—lifts the degeneracy of reflection zeros in forward and backward directions, and introduces a complex singularity with a positive imaginary part necessary for a full 2π-phase gradient. Our work establishes a general framework to predict and study the response of resonant systems in photonics and metaoptics.

Original languageEnglish
Pages (from-to)1287-1293
Number of pages7
JournalOptica
Volume10
Issue number10
DOIs
StatePublished - 20 Oct 2023

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