Sensing Properties and Sensitivity Improvement of an Asymmetric Waveguide with Dispersive Left-handed Material

Optical sensors supporting resonant phenomena have been extensively employed for characterizing surface effects manifested in the vicinity of a metallic layer and a dielectric of opposite permittivities. To get appreciable sensing performance in terms of detection accuracy and resolution highly required in various applications such as biochemical and gas sensing, various plasmonic materials were proposed in the literature. Importantly, the proper responses of possible arrangements between active layers and dielectric media when stimulated with an external incident light differ on the field profiles, energy distribution and dispersion properties.