TY - JOUR
T1 - Asymmetric phase modulation of light with parity-symmetry broken metasurfaces
AU - Mikheeva, Elena
AU - Colom, Rémi
AU - Achouri, Karim
AU - Overvig, Adam
AU - Binkowski, Felix
AU - Duboz, Jean Yves
AU - Cueff, Sébastien
AU - Fan, Shanhui
AU - Burger, Sven
AU - Alù, Andrea
AU - Genevet, Patrice
N1 - Publisher Copyright:
© 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.
PY - 2023/10/20
Y1 - 2023/10/20
N2 - 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.
AB - 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.
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U2 - 10.1364/OPTICA.495681
DO - 10.1364/OPTICA.495681
M3 - Article
AN - SCOPUS:85175426545
SN - 2334-2536
VL - 10
SP - 1287
EP - 1293
JO - Optica
JF - Optica
IS - 10
ER -