Liquid Crystal Colloids Studied by THz Time-Domain Spectroscopy

Autor:	Hiroshi Yokoyama, Mischa Bonn, Mattijs Koeberg, Masahito Oh-e, Euan Hendry
Rok vydání:	2008
Předmět:	Chemistry Liquid crystal Terahertz radiation Attenuation coefficient Analytical chemistry General Materials Science General Chemistry Dielectric Condensed Matter Physics Spectroscopy Refractive index Spectral line Terahertz spectroscopy and technology
Zdroj:	Molecular Crystals and Liquid Crystals. 480:21-28
ISSN:	1563-5287 1542-1406
Popis:	THz time-domain spectroscopy is used to measure the frequency dependent (0.2–2.0 THz) complex refractive index of a pure liquid crystal (LC), 4′-n-pentyl-4-cyanobiphenyl (5CB), and its LC colloids with SiO2 particles. While the refractive index of the pure LC is found to vary markedly due to distinct orientated domains within the sample, the LC colloids provide us with very stable and reproducible spectra, from which we can reliably deduce the optical constants of pure 5CB using effective medium theory. While the absorption coefficient is found to be very small, the refractive index of 5CB decreases considerably over our probe frequency range.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::61cc44f074e92cd077507f9e6f45ee4b https://doi.org/10.1080/15421400701821317 Zobrazit plný text záznamu