Differential scanning calorimetry measurements have been performed on elemental Se as well as on GexSe94 xIn6 (x 1⁄4 4, 8, and 11 at%) and on GeySe88 yIn12 (y 1⁄4 5, 7, and 9 at%) chalcogenide glasses. From the cooling rate dependence of the fictive temperature, the apparent activation energies, Dh*, and the fragility indices, m, as defined in the strong–fragile glass-forming liquid concept, ar...

The lifetime of 1.3 lm emission from Dy-doped Ge–As–S glass containing very small amount of Ga and CsBr reveals interesting temperature dependence; with the addition of Ga/CsBr up to 0.2 mol% the lifetime decreases with increasing temperature. When the concentration of Ga/CsBr reaches 0.3 mol%, however, the lifetime remains relatively constant regardless of temperature change. For further addit...

On the basis of Maxwell's equations and a plane wave expansion method, photonic band structure is computed for 3D chalcogenide photonic crystal with diamond lattice. The geometrical influence on the photonic bandgap is studied for three dimensional chalcogenide photonic crystal of diamond lattice for both chalcogenide spheres in air and air spheres in chalcogenide background. The air spheres in...

A highly nonlinear photonic crystal fiber with eight ring octagonal structure is proposed. Chalcogenide glass of As2S3 is used as the material for this photonic crystal fiber structure. The finiteelement method with perfectly matched boundary layer is employed to analyze the guiding properties. Non linearity of 13,584.5 per W-km is obtained at 1.55 μm with reasonable flattened dispersion of -25...

We give a simple demonstration of the formula relating the glass transition temperature, Tg, to the molar concentration x of a modifier in two types of glasses: binary glasses, whose composition can be denoted by XnYm+xMpYq, with X an element of III-rd or IV -th group (e.g. B, or Si, Ge), while MpYq is an alkali oxide or chalcogenide; next, the network glasses of the type Ax B1−x, e.g. Gex Se1−...

The realization of an all-solid microstructured optical fiber based on chalcogenide glasses was achieved. The fiber presents As(2)S(3) inclusions selected as low refractive index material (n = 2.4) embedded in a As(38)Se(62) glass matrix (n = 2.8). The single mode regime of the fiber was demonstrated both theoretically by multipole method calculations and experimentally by near field measuremen...

A time domain simulation algorithm for the investigation of propagation properties of nonlinear Surface-PlasmonPolaritons (SPP) mode through gallium lanthanum sulphide (GLS) layer in Ag-GLS-Ag waveguide is presented. GLS, a semiconducting chalcogenide glass is known as ultrafast nonlinear device due to their high material non-linearity with strong confinement and dispersion. The time domain sim...

Phase-change memories (PCM) are associated with reversible ultra-fast low-energy crystal-to-amorphous switching in GeTe-based alloys co-existing with the high stability of the two phases at ambient temperature, a unique property that has been recently explained by the high fragility of the glass-forming liquid phase, where the activation barrier for crystallisation drastically increases as the ...