Superanomalous skin effect for surface plasmon-polaritons

Professor I. A. Larkin

Institute of Microelectronics, Russian Academy of Sciences

2018年12月20日（周四）下午3：30

It is commonly assumed that surface plasmon-polariton (SPP) excitations on a metal-dielectric interface decay exponentially inside the metallic sample. Here we show that at high frequency and wave vector the SPP field decays much slower, being inversely proportional to the distance to the interface modified by an additional logarithmic factor. This dependence differs from the standard anomalous skin effect where field decays as (1/z)^2. We provisionally referred to it as “superanomalous”. Its origin is the non-locality and the logarithmic singularity of the dielectric permittivity in metals. This type of decay is pronounced for SPP modes of higher frequencies, but is suppressed for red – infrared light range.