Slab Waveguide Sensor with Left-handed Material Core Layer for Detection an Adlayer Thickness and Index

A four-layer slab waveguide structure with a lossy left-handed material (LHM) core layer is investigated as a surface sensor for detection any change in an adlayer thickness and refractive index. The sensitivities of the effective refractive index to any change in the refractive index/thickness of the adlayer are derived and studied with the parameters of the LHM. It is found that a slight change in the real parts of the permittivity and permeability of the LHM can significantly improve the sensitivity of the proposed sensor

Dispersion properties of slab waveguides with double negative material guiding layer and nonlinear substrate

The dispersion properties of transverse electric nonlinear waves in a three-layer slab waveguide which consists of a double negative material (DNM) guiding layer sandwiched between an intensity-dependent refractive index substrate and semi-infinite linear dielectric cover are investigated. The dispersion properties for self-focusing and self-defocusing substrate nonlinearity are presented. The effects of the negative parameters of the DNM on the dispersion characteristics are investigated

Scaling 5ules for a 6lab: aveguide 6tructure &omprising 1onlinear and 1egative, ndex 0aterials

We consider a Kerr-type nonlinear guiding layer surrounded by at least one medium made of a negative index material (NIM). Three different structures are investigated in this work. The first structure has a NIM cladding, the second has a NIM substrate, and the third has a NIM substrate and cladding. Three normalized parameters are used to study the dispersion characteristics of these waveguide structures. The dispersion curves are obtained and the effect of the NIM parameters on the guidance properties is presented. It is found that the dispersion characteristic of nonlinear waveguide structure with NIM cladding and dielectric substrate are similar to those for the same structure with NIM substrate and dielectric cladding. However, when both of them are NIMs new properties can be seen

Guided modes in slab waveguides with negative index cladding and substrate

In this work, three normalized parameters are used to study the dispersion characteristics of three different asymmetric slab waveguide structures. Each structure contains at least one layer made of left-handed material (LHM). The first structure comprises a LHM cladding layer, the second contains a LHM substrate layer, and the third has a LHM cladding and substrate. The results show that the dispersion characteristics of these structures differ from conventional guided waves in waveguide structures comprising right-handed materials. A number of unusual properties are observed including the dispersion characteristics of the fundamental mode for the first structure is different for different μc and μs. The fundamental mode exists and can only propagate within a small frequency range in the second structure. In the third structure, the fundamental mode does not exist whereas the first-order mode exists in a narrow

Scaling rules for a slab waveguide structure comprising nonlinear and negative index materials‏

We consider a Kerr-type nonlinear guiding layer surrounded by at least one medium made of a negative index material (NIM). Three different structures are investigated in this work. The first structure has a NIM cladding, the second has a NIM substrate, and the third has a NIM substrate and cladding. Three normalized parameters are used to study the dispersion characteristics of these waveguide structures. The dispersion curves are obtained and the effect of the NIM parameters on the guidance properties is presented. It is found that the dispersion characteristic of nonlinear waveguide structure with NIM cladding and dielectric substrate are similar to those for the same structure with NIM substrate and dielectric cladding. However, when both of them are NIMs new properties can be seen