Above-light-line Nonlinear Surface Polaritons near a Conductive Interface: Threshold Case
Main Article Content
We investigate the TM-polarized nonlinear surface polaritons (NLSP) propagating along a
guided structure consisting of a magnetic optically linear medium and a non-magnetic optically
nonlinear medium with saturable permittivity separated by a flat conductive layer of zero
thickness. We consider those values of hosting media bulk material parameters for which the
NLSP existence (for zero sheet conductance) has threshold character with respect to the waves
intensity. Based on the exact solution of Maxwell's equations we show that the energy and
propagation properties of the NLSP near the above-light-line condition (1 > n > 0) depend
considerably on the surface conductivity of the layer, even the threshold character of the NLSP
can be lost; for certain sheet conductance values these waves can exist in a linear limit. The
NLSP propagation constant is defined by both the surface conductivity and field intensity and
can be varied in a wide diapason, which gives an opportunity to obtain and control the important
for quantum information processing 0 n condition. For a chosen value of the NLSP
propagation constant the NLSP field intensity and energy flux decries when the surface
conductivity grows; saturation of the nonlinear permittivity leads to an increase of the NLSP
energy flux compared with Kerr-like nonlinearity.
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