CINECA IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishA new kind of a liquid crystal cell has been made by using a standard sandwich configuration with one of the ITO electrodes, covered by a thin layer of tungsten trioxide deposited by r.f. sputtering in a reactive atmosphere of Ar and O-2 gas. In this kind of cell the optical polarisation switching of the cell (observed under a crossed polarizer microscope) occurs only for one of the two directions of the a.c, applied field, while in the usual liquid crystal cells the electro-optic response does not depend on the sign of field. The inhibiting switching configuration corresponds to the anodic polarisation of tungsten trioxide film in which the de-intercalation of cations occurs. Preliminary impedance measurements reveal an ionic diffusion process in such devices (Warburg impedance behavior). These preliminary results suggest speculations about a reverse internal electric field, which is responsible for the increased threshold of optical switching in one direction only of the applied field. (C) 1999 Elsevier Science Ltd. All rights reserved.
A new kind of a liquid crystal cell has been made by using a standard sandwich con®guration with one of the ITO electrodes, covered by a thin layer of tungsten trioxide deposited by r.f. sputtering in a reactive atmosphere of Ar and O2 gas. In this kind of cell the optical polarisation switching of the cell (observed under a crossed polarizer microscope) occurs only for one of the two directions of the a.c. applied ®eld, while in the usual liquid crystal cells the electro-optic response does not depend on the sign of ®eld. The inhibiting switching con®guration corresponds to the anodic polarisation of tungsten trioxide ®lm in which the de-intercalation of cations occurs. Preliminary impedance measurements reveal an ionic diusion process in such devices (Warburg impedance behavior). These preliminary results suggest speculations about a reverse internal electric ®eld, which is responsible for the increased threshold of optical switching in one direction only of the applied field.
Insertion of thin films of WO3 in liquid crystal cells / Cazzanelli, E; Scaramuzza, Nicola; Strangi, Giuseppe; Versace, Consolato Carlo; Pennisi, A; Simone, F.. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - 44:18(1999), pp. 3101-3109.
Scheda prodotto non validato
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo
| Titolo: | Insertion of thin films of WO3 in liquid crystal cells |
| Autori: | |
| Data di pubblicazione: | 1999 |
| Rivista: | |
| Citazione: | Insertion of thin films of WO3 in liquid crystal cells / Cazzanelli, E; Scaramuzza, Nicola; Strangi, Giuseppe; Versace, Consolato Carlo; Pennisi, A; Simone, F.. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - 44:18(1999), pp. 3101-3109. |
| Abstract: | A new kind of a liquid crystal cell has been made by using a standard sandwich configuration with one of the ITO electrodes, covered by a thin layer of tungsten trioxide deposited by r.f. sputtering in a reactive atmosphere of Ar and O-2 gas. In this kind of cell the optical polarisation switching of the cell (observed under a crossed polarizer microscope) occurs only for one of the two directions of the a.c, applied field, while in the usual liquid crystal cells the electro-optic response does not depend on the sign of field. The inhibiting switching configuration corresponds to the anodic polarisation of tungsten trioxide film in which the de-intercalation of cations occurs. Preliminary impedance measurements reveal an ionic diffusion process in such devices (Warburg impedance behavior). These preliminary results suggest speculations about a reverse internal electric field, which is responsible for the increased threshold of optical switching in one direction only of the applied field. (C) 1999 Elsevier Science Ltd. All rights reserved. |
| Handle: | http://hdl.handle.net/20.500.11770/144302 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
http://hdl.handle.net/20.500.11770/144302
Copyright © 2021