PHASE MODULATION TIME DEPENDENCE MEASUREMENT

Autor:	Timothy D. Wilkinson, G. M. Long, William A. Crossland
Rok vydání:	2004
Předmět:	Materials science Continuous phase modulation business.industry General Chemistry Condensed Matter Physics Molecular physics Ferroelectricity Interferometry symbols.namesake Fourier transform Optics Planar Liquid crystal Phase response symbols General Materials Science business Phase modulation
Zdroj:	Molecular Crystals and Liquid Crystals. 413:479-488
ISSN:	1563-5287 1542-1406
DOI:	10.1080/15421400490439130
Popis:	Phase modulation using liquid crystals has wide-ranging applications including correlation [1] and telecommunications [2,3]. At present, relatively slow (order 5ms) nematic cells demonstrate the advantage of continuous phase modulation but are sensitive to polarisation of the input light [4,5]. The alternative is to use faster ferroelectric cells which exhibit polarisation insensitivity but show only binary phase modulation [2]. This work demonstrates a novel technique for measuring the phase response time, which allows evaluation of different cell topologies. Rise and fall times are calculated in the Fourier plane from a wave-front splitting interferometer. Phase modulation measurements of in-house cells have been made for planar and hybrid aligned liquid crystal cells using nematic liquid crystals. The results demonstrate the capabilities of in-house cells, and also show agreement with theoretical predictions of cell behaviour.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0a5d9913a3343be8605d99f93ff07015 https://doi.org/10.1080/15421400490439130 Zobrazit plný text záznamu