Abstract

Blue phases are networks of disclination lines, which occur in cholesteric liquid crystals near the transition to the isotropic phase. They have recently been used for the new generation of fast switching liquid crystal displays. Here we study numerically the steady states and switching hydrodynamics of blue phase I (BPI) and blue phase II (BPII) cells subjected to an electric field. When the field is on, there are three regimes: for very weak fields (and strong anchoring at the boundaries) the blue phases are almost unaffected, for intermediate fields the disclinations twist (for BPI) and unzip (for BPII), whereas for very large voltages the network dissolves in the bulk of the cell. Interestingly, we find that a BPII cell can recover its original structure when the field is switched off, whereas a BPI cell is found to be trapped more easily into metastable configurations. The kinetic pathways followed during switching on and off entails dramatic reorganisation of the discli nation networks. We also discuss the effect of changing the director field anchoring at the boundary planes and of varying the direction of the applied field.

Autore Pugliese

• Gonnella Giuseppe

Tutti gli autori

• TIRIBOCCHI A.;GONNELLA G.

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2011

ISSN

1744-683X

ISBN

Non Disponibile

Numero di citazioni Wos

36

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

37

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile