Longitudinal electromagnetic waves with extremely short wavelength Article Swipe
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· 2021
· Open Access
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· DOI: https://doi.org/10.1103/physrevb.104.l100304
· OA: W3137977447
Electromagnetic waves in vacuum and most materials have transverse\npolarization. Longitudinal electromagnetic waves with electric field parallel\nto wave vector are very rare and appear under special conditions in a limited\nclass of media, for example in plasma. In this work, we study the dispersion\nproperties of an easy-to-manufacture metamaterial consisting of two\nthree-dimensional cubic lattices of connected metallic wires inserted one into\nanother, also known as an interlaced wire medium. It is shown that the\nmetamaterial supports longitudinal waves at extremely wide frequency band from\nvery low frequencies up to the Bragg resonances of the structure. The waves\nfeature unprecedentedly short wavelengths comparable to the period of the\nmaterial. The revealed effects highlight spatially dispersive response of\ninterlaced wire medium and provide a route toward generating electromagnetic\nfields with strong spatial variation.\n
