Using Tungsten Oxide Based Thin Films for Optical Memory and the Effects of Using IR Combined with Blue/Blue-Green Wavelengths

Abstract

Inflation symmetry is one of the peculiar features of the diffraction pattern of a quasicrystal. However, it is not an exclusive property of quasicrystalline structures and it may be present in incommensurately modulated structures, as shown recently in the Al-Mg system (Donnadieu P et al 1996 J. Physique I 6 1153-64). The conditions that a single modulation parameter of an incommensurate structure must fulfil in order to have inflation symmetry are determined. Although the number of possible distinct inflation-symmetric quasilattices is infinite, from physical/experimental arguments it can be concluded that, in practice, only a few of them can be experimentally observed, the reported phase of the Al-Mg system being one of these particular cases. A quantitative criterion to classify the modulation parameters that give rise to quasilattices with observable inflation symmetry is proposed. The generalization of the analysis of incommensurate structures with more than one single modulation parameter is also discussed. Finally, the inflation parameters of diffraction patterns with rotational point groups of finite order, C N , are compared with the parameters of the one-dimensional case.

Confocal spectromicroscopy of amorphous and nanocrystalline tungsten oxide films

“…However, other compounds are subject of continuous investigation for optical recording media [4]. In particular, tungsten oxide, well known for its electrochromic properties [6], was studied in [7][8][9][10][11]. The use of a reversible photoredox reaction under two-wavelength laser excitation of tungsten oxide in air was proposed for optical memory media in [7,8].…”

“…In particular, tungsten oxide, well known for its electrochromic properties [6], was studied in [7][8][9][10][11]. The use of a reversible photoredox reaction under two-wavelength laser excitation of tungsten oxide in air was proposed for optical memory media in [7,8]. The reflectance change upon heat treatment of WO 3 /metal thin-film bilayered structures was studied in [9].…”

Structure and optical properties of mesoporous tungsten oxide

“…When the UV-light is removed, WO 3 recovers to its original transparent state again. This important chromogenic behavior has received considerable interest for technological applications for 'smart' window, large area displays and erasable optical storage devices [6][7][8].…”

Preparation of inorganic solid state thin film for electrochromic application

“…Electrochromic devices using amorphous tungsten trioxide WO 3 thin films have attracted considerable attention because of their superior characteristics such as wide view angle, low power consumption, longer memory effect and less stress for our eyes [1][2][3][4][5][6][7][8][9][10]. In the stoichiometric WO 3 system, the tungsten ion has a valence state of W 6+ .…”