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Open AccessArticle

Negative Effective Mass in Plasmonic Systems

Department of Chemical Engineering, Ariel University, Ariel 407000, Israel
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Materials 2020, 13(8), 1890; https://doi.org/10.3390/ma13081890
Received: 28 March 2020 / Revised: 13 April 2020 / Accepted: 15 April 2020 / Published: 17 April 2020
(This article belongs to the Special Issue Metamaterials and Devices)
We report the negative effective mass (density) metamaterials based on the electro-mechanical coupling exploiting plasma oscillations of a free electron gas. The negative mass appears as a result of the vibration of a metallic particle with a frequency of ω, which is close the frequency of the plasma oscillations of the electron gas m 2 relative to the ionic lattice m 1 . The plasma oscillations are represented with the elastic spring k 2 = ω p 2 m 2 , where ω p is the plasma frequency. Thus, the metallic particle vibrated with the external frequency ω is described by the effective mass m e f f = m 1 + m 2 ω p 2 ω p 2 ω 2 , which is negative when the frequency ω approaches ω p from above. The idea is exemplified with two conducting metals, namely Au and Li. View Full-Text
Keywords: metamaterials; negative effective mass; plasma oscillations; low frequency plasmons metamaterials; negative effective mass; plasma oscillations; low frequency plasmons
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Bormashenko, E.; Legchenkova, I. Negative Effective Mass in Plasmonic Systems. Materials 2020, 13, 1890.

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