Their thicknesses define the location of the dispersion line in the band gap.
Figure 2(a) shows the relation of the BSW dispersion line in the photonic bandgap for different thicknesses of top layer (red curve) and additional layer (blue curve).
It is revealed in the dispersion diagram, Fig. 1(b) that by increasing the thickness of the additional layers, the BSW dispersion line moves towards the edge of the band gap which means higher propagation constant at a fixed wavelength.
A low-loss and flat dispersion line-defect photonic crystal waveguide is proposed with a simplified waveguide-design on silicon-on-insulator (SOI) based on hexagonal lattice of 2D photonic crystals.
For example, referring to the propagation length plot and the dispersion band diagram [Figs. 1(b) and 4(c) inset], the propagation length for a 30 nm-thick TiO2 layer is the longest compared to other thicknesses and the dispersion line lies at the middle of the bandgap.
The evaluation of the data was performed with the WVASE32 software applying stratified layer optical model, taking into account the substrate and an organic layer, where the real part of the refractive index was described using a Cauchy dispersion line shape.
A novel, simple, fast, and miniaturized method, termed in-line micro-matrix solid-phase dispersion (in-line MMSPD), coupled with high performance liquid chromatography (HPLC) was developed for the simultaneous extraction and determination of Sudan dyes (i.e. Sudan I IV, Sudan orange G, Sudan black B, and Sudan red G) with the aid of an experimental design strategy.
In contrast, the adsorption spectrum of rGO-Au nanocomposite dispersion (red line) peaks at ~570 nm, indicating that the Au nanoparticles firmly attach to the surface of the rGO sheets.
To address this issue, a specific dispersion compensation line was developed allowing compensation of the second and third orders of dispersion as well as management of self-phase modulation in the fiber [ 19].
The first excitation-wavelength-tunable nonlinear fiber-optic spectrometer has been developed, featuring a specific dispersion compensation line, which allows an excitation wavelength tunability from 800 to 900 nm.
