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What is Nonreciprocity? Part II

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arxiv 1804.00238 v2 pith:3HHSBE22 submitted 2018-04-01 physics.optics

Christophe Caloz , Andrea Alù , Sergei Tretyakov , Dimitrios Sounas , Karim Achouri , Zoé-Lise Deck-Léger This is my paper · ORCID
classification physics.optics
keywords partsystemslinearemphnonreciprocityaddressesawplbreaking
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This paper is the second part of a two-part paper on \emph{Electromagnetic (EM) Nonreciprocity (NR)}. Part~I has defined NR, pointed out that linear NR is a stronger form of NR than nonlinear (NL) NR, explained EM Time-Reversal (TR) Symmetry (TRS) Breaking (TRS-B), described linear Time-Invariant (TI) NR media, generalized the Lorentz reciprocity theorem for NR, and provided a physical interpretation of the resulting Onsager-Casimir relations~\cite{Caloz_AWPL_NR_I_2018}. This part first explains the TR specificity of lossy and open systems. Next, it proposes an extended version of the S-parameters for \emph{all NR} systems. Then, it presents the fundamentals of linear-TI (LTI) NR, linear Time-Variant (LTV) Space-Time (ST) modulated NR and NL NR systems. Finally, it addresses confusions between with systems.

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  1. Direct interferometric measurement of non-reciprocity induced by a plasmonic metasurface with false chirality

    physics.optics 2025-06 reject novelty 6.0 of 10

    A static plasmonic metasurface with a gradient of rotated apertures is claimed to break time-reversal symmetry and exhibit non-reciprocity, detected as a phase shift in a Sagnac interferometer.

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