A detailed analysis of the optical properties of silicon rich oxides (SRO) thin films and the factors that influence them is presented. SRO films with different Si content were synthesized via LPCVD (low pressure chemical vapor deposition) on sapphire substrates.…

We study a novel electro-optic structure with potential applications for ray steering, optical multiplexers, logic gates or switches. Our idea is based on the electrical tuning of refraction in a two-dimensional photonic crystal infilled by a liquid-crystal, with a direct-current…

Thin and adherent coatings of molybdenum black solar selective coatings have been produced on copper substrates by immersion in solutions with different concentration of ammonium molybdate. The copper sheet was polished prior to immersion in the molybdate solution. XRD analyses…

Silver nanoparticles were synthesized using a green chemistry method. Stable silver nanoparticles in a colloidal aqueous solution were prepared successfully by the chemical reaction of silver nitrate (AgNO3) and Opuntia ficus indica aqueous extract, used as both, reducing and stabilizing…

The results obtained from the growth and characterization of AlχGa1–χ As/GaAs multilayer structures by a Metalorganic Chemical Vapor Deposition (MOCVD) system based on metallic arsenic are presented. The MOCVD system was adapted in order to be used for the growth…

Cadmium sulphide (CdS) thin films were prepared by means of the chemical spray pyrolysis technique. The substrate temperature was varied in the range from 200 to 400°C. The structural properties of the semiconductor were characterized by X-ray diffraction; XRD patterns…

Aggregation of 1-N-methylamino-4'-nitroazobenzene (RED-H) was studied by UV-vis spectroscopy in solution, using different methanol: water mixtures as solvents, at different concentrations. In 100 % methanol, methanol: water 80:20 and 60:40, RED-H exhibited an maximum absorption wavelength at λ = 477…

Thin films of n-type CdSe have been grown on Corning glass substrate by chemical bath deposition, prepared with Sodium Seleno-Sulphate (Na2SSeO3), Cadmium Chloride (CdCl2) and Indium Tri-Chloride (InCl3), mixed in an aqueous environment. The effects of different In doping concentrations…

Non linear optical (NLO) properties of a new series of pnPEGMAN polymers: p2PEGMAN or Poly[(E)-2-(2-(methyl(4-((4-nitrophenyl) diazenyl)phenyl) amino)ethoxy)ethyl methacrylate], p3PEGMAN or Poly[(E)-2-(2-(2-(methyl(4-((4-nitrophenyl)diazenyl)phenyl) amino) ethoxy)ethoxy)ethyl methacrylate], p4PEGMAN or Poly[(E)-2-(4-((4-nitrophenyl)diazenyl)phenyl)-5,8,11-trioxa-2-azatridecan-13-yl methacrylate] and p6PEGMAN or Poly[(E)-2-(4-((4-nitrophenyl) diazenyl) phenyl) -5,8,11,14,17-pentaoxa -2-azanonadecan -19-yl methacrylate] were studied…

This work gives a novel criterion to predict the formation of alkali halide solid solutions and discusses some results obtained in the development of ternary and quaternary miscible crystalline dielectric mixtures of alkali halides. These mixtures are miscible in any…