Evanescent Wave Sensors with a Left-Handed Material as a Substrate

摘要

In this work, we examine analytically the propagation of TE and TM polarized waves in a three-layer slab waveguide with the substrate layer made of a left-handed material of negative and complex permittivity and permeability. The dispersion relation, the penetration depth, and the power flowing through each layer are derived. The effect of the negative optical parameters of the substrate on these parameters is studied in detail. The structure is also treated as an evanescent wave optical sensor. The sensitivity of this sensor is presented and studied with different parameters of the structure.