Space-time gradient metasurfaces

By Y. Hadad, Dimitrios L. Sounas, Andrea Alù. 2015

336 citations recorded by the source corpus.

Metasurfaces characterized by a transverse gradient of local impedance have recently opened exciting directions for light manipulation at the nanoscale. Here we add a temporal gradient to the picture, showing that spatio-temporal variations over a surface may largely extend the degree of light manipulation in metasurfaces, and break several of their constraints associated to symmetries. As an example, we synthesize a non-reciprocal classical analogue to electromagnetic induced transparency, opening a narrow window of one-way transmission in an otherwise opaque surface. These properties pave the way to magnetic free, planarized non-reciprocal ultrathin surfaces for free-space isolation.

Subfields: Aerospace Engineering, Biomedical Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/e75ba0822631237f50a1853db7d301968f9d1421

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In Aerospace Engineering

In Biomedical Engineering

In Electronic, Optical and Magnetic Materials

Citations in the corpus

Spacetime Metamaterials—Part II: Theory and Applications (2020, background): “nonreciprocal specular reflection or/and transmission [70], [71] and spatial nonreciprocal circulation [72].”
Large optical nonlinearity of nanoantennas coupled to an epsilon-near-zero material (2018, methodology): “Thus, by combining both strategies one could design an all-optical space-time gradient metasurface to break the geometrical and temporal symmetry on-chip [38, 39], design ultrafast temporal holograms, and control the directivity of emission using an optical gate signal [40, 41].”
Mixer-Duplexer-Antenna Leaky-Wave System Based on Periodic Space-Time Modulation (2016, background): “Several applications of space-time modulated nonreciprocal structures have been subsequently reported, including isolators [10], circulators [16], [17], nonreciprocal metasurfaces [18]–[21], and nonreciprocal antennas [22]–[26].”
Phase-Induced Frequency Conversion and Doppler Effect With Time-Modulated Metasurfaces (2020, neutral): “time-modulated metasurface ([24], [25], [54]–[56] and references within).”
Tailoring Structure‐Borne Sound through Bandgap Engineering in Phononic Crystals and Metamaterials: A Comprehensive Review (2022, background): “Time-varying photonic meta-surfaces then emerged to show exotic optical functionalities such as unidirectional electromagnetic induced transparency [346], strong and broadband nonreciprocal wave transmission [347–349], frequency mixing [350], compact flat prism [351], and controlled linear frequency”
Perfect control of reflection and refraction using spatially dispersive metasurfaces (2016, background): “Initial work on spacetime modulated metasurfaces [57,58] produced interesting and promising results, and we expect that developing this route may lead to realizations of theoretically perfectly operating lossless nonuniform metasurfaces.”