Reflection-mode electro-optical plasmonic modulator: electromagnetic modelling by the method of single expression

The performed numerical analysis demonstrates an application of a surface plasmon phenomenon for efficient modulation of light intensity in the reflection mode. A supply of modulating high frequency electrical signal to an electro-optical thin layer located upon a thin metallic layer supporting surface plasmons is assumed. The narrow plasmonic and waveguide dips in the angular reflection spectrum are sensitive to the change of the permittivity of the cover electro-optical nano-layer. Numerical analysis is performed for the relevant metal-dielectric multi-nano-layer structure at the oblique incidence of transverse magnetic (TM) wave. For electromagnetic analysis the frequency-domain method of single expression (MSE) is used. The performed analysis permitted to obtain all necessary parameters relevant to the thicknesses of metallic and electro-optic material for efficient optical wave intensity modulation.