Optical nonlinearity in the nematic phase of bent-core mesogens

Autor:	Oriano Francescangeli, Liana Lucchetti, Eric A. Scharrer, Francesco Simoni, Francesco Vita
Rok vydání:	2015
Předmět:	Optics Materials science Liquid crystal business.industry Mesogen Phase (matter) Bent molecular geometry Nonlinear optics Self-phase modulation business Refractive index Atomic and Molecular Physics and Optics Gaussian beam
Zdroj:	Optics Letters. 40:2953
ISSN:	1539-4794 0146-9592
Popis:	Nonlinear optical response of the cybotactic nematic phase of a bent-core mesogen has been investigated for the first time through self-phase modulation induced by a Gaussian beam. The material exhibits a high nonlinear response achieving a nonlinear index n(2)≈5×10(-5) cm(2)/W and an unconventional behavior characterized by two different regimes. While the high-intensity regime can be easily explained in terms of a thermal indexing effect, the low-intensity regime is metastable and characterized by an unusual dependence on the irradiation energy. It is suggested that a change of the director configuration, possibly due to a light-induced modification of surface anchoring, is responsible for the observed behavior.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4927f23258d3fea369cfe805a52c7939 https://doi.org/10.1364/ol.40.002953 Zobrazit plný text záznamu