Two different types of lasing modes, vertical Fabry-Perot cavity and random lasing, were observed in ZnO epi-films of different thicknesses grown on Si (111) substrates. Under optical excitation at room temperature by a frequency tripled Nd:YVO₄ laser with wavelength of 355 nm, the lasing thresholds are low due to high crystalline quality of the ZnO epitaxial films, which act as microresonators...

Optical constants and roughness study of dc magnetron sputtered iridium films" (2002). Faculty Publications from the Department of Electrical and Computer Engineering. 5. Extremely smooth thin films of iridium have been deposited onto superpolished fused silica substrates using dc magnetron sputtering in an argon plasma. The influence of deposition process parameters on film microroughness has ...

We observe asymmetric color filtering under unpolarized incidence in a structured metallic (Ag) film, where the center of an optically thick circular Ag disk surrounded by a step gap appears dark when observed from one side, and bright from the other. The latter situation corresponds to abnormally high optical transmission through the optically thick film. We explain this by a three-step proces...

in this paper, we proposed a novel structure for designing all optical filter based on photonic crystal structure. in designing the proposed filter, we simply employed a point defect localized between input and output waveguides as wavelength selecting part of the filter. the initial form of this filter is capable of selecting optical waves at =1560 nm, the transmission efficiency of the filte...

The NiO/PVA thin film was prepared by drop-casting the nickel oxide nanoparticles synthesized chemical precipitation method. structural and optical characteristics of were investigated using XRD UV-VIS absorption. nonlinear property Nickel studied open aperture Z-scan method at 532 nm. two-photon absorption coefficient calculated with different intensities. With increasing input intensity, valu...

The performance of novel solid state Thick-Film pH sensors for water quality sampling that are designed for deployment in remote catchment areas is described. These miniaturised screen printed planar pH sensors are an alternative to conventional glass pH electrodes that have many disadvantages such as high-cost, large size, mechanical fragility and limited shape. The approach adopted here for i...

Abstract The effect of Ag content on the linear and nonlinear optical characteristics thermal evaporated Se 90− x Te 10 thin films, 100 nm thick, (where = 0, 2, 4, 6, 8 at.%) has been examined. measurements were reviewed in wavelength range 390–2500 based transmittance reflectance data, amorphous state as-prepared film was confirmed by X-ray diffraction. absorption coefficient, extinction bandg...

Flexible electronic displays and touch screens are increasingly used in demanding outdoor environments. Design engineers are challenged to develop optical systems that meet a wide thermal range (-55° to + 85° C) and comply with diverse optical, electrical and mechanical parameters. This paper discusses the optical and mechanical properties of substrates and thin and thick film coatings used in ...