Effect of dynamically changing the substrate's easy axis on the response time of nematic samples

Autor(es)

de Souza, R. F. ^[1] ; Granado, S. A. ^[2] ; Evangelista, L. R. ^[1] ; Lenzi, E. K. ^[3] ; Li, Q. ^{[4, 5]} ; Zola, R. S. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Maringa, Dept Fis, Ave Colombo 5790, BR-87020900 Maringa, Parana - Brazil

^[2] Univ Tecnol Fed Parana, Dept Fis, Rua Marclio Dias 635, BR-86812460 Apucarana, Parana - Brazil

^[3] Univ Estadual Ponta Grossa, Dept Fis, BR-87030900 Ponta Grossa, PR - Brazil

^[4] Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44242 - USA

^[5] Kent State Univ, Liquid Crystal Inst, Kent, OH 44242 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS-CONDENSED MATTER; v. 30, n. 50 DEC 19 2018.
• Citações Web of Science: 1

Resumo

Recent discoveries of advanced photocontrolled materials have kindled a great deal of interest on their use as command surfaces that switch easy axis under light radiation. One noticeable point when using switchable surfaces on any application is how the dynamical process propagates to the bulk directors. In this paper, we theoretically study the effect of a relaxing easy axis over time on a nematic sample when finite anchoring energy and surface viscosity are included. We first consider the case where just one of the substrates decay over time in an initially distorted director organization. Next, we assume that both substrates can be switched simultaneously. From the calculated director we obtained the optical profile and finally the molecular response time of the material. The response time depends on both the materials and the surfaces properties including its decay time. Our results might be used for understanding and engineering liquid crystal displays and other electro-optical devices with photocontrolled alignment layers. (AU)

• Processo FAPESP: 14/50983-3 - INCT 2014: fluidos complexos
• Beneficiário: Antonio Martins Figueiredo Neto
• Linha de fomento: Auxílio à Pesquisa - Temático