Abstract
We propose a new concept of localized surface plasmon polariton (SPP) mode excitation in a spherical nanoparticle, which utilizes a collective mechanism of dissipative instability in an adjacent 2D plasma carrying a DC electric current. We show that 2D DC current becomes unstable at optical frequencies when the drift velocity exceeds the speed of sound in the 2D plasma. Dissipative instability emerges as a result of self-consistent 2D plasma oscillations coupled to the electromagnetic modes of the nanosphere, the material of which is absorbing at given frequency (i.e., the dielectric permittivity Imε > 0), and instability is absent in the case of transparent material. We derive the dispersion equation for this dissipative instability by a self-consistent solution of the Maxwell equations for the electromagnetic modes and the hydrodynamic equations for the 2D plasma current. Our estimates demonstrate attainment of very high instability increments Imω ~ 1015 s−1, which makes the proposed concept very promising for excitation of plasmonic nanoantennas.
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Smetanin, I.V., Bouhelier, A. & Uskov, A.V. Coherent Excitation of Optical Oscillations in a Metal Nanosphere by a 2D Electric Current. J Russ Laser Res 39, 484–491 (2018). https://doi.org/10.1007/s10946-018-9743-z
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DOI: https://doi.org/10.1007/s10946-018-9743-z