EEE 537 L2 Materials for Optoelectronics

EEE 537 L2 Materials for Optoelectronics - Chapter 1...

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Chapter 1: Materials for Optoelectronics Anything else ? Flow like a liquid Order in all ranges SRO d LRO i But with orientational order No center-of-mass order SRO, and LRO in a domain Order (Symmetry) determines/dictates properties! Short range order (SRO): scale of a few atoms Long range order (LRO) : thousands of atoms c1 c2
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Slide 1 c1 information can be found at : http://www.britannica.com/ebc/article-51804 cning, 8/7/2007 c2 Liquid crystals are also not quite liquid and not quite solid. Physically, they are observed to flow like liquids, but they have some properties of crystalline solids. Liquid crystals can be considered to be crystals which have lost some or all of their positional order, while maintaining full orientational order. For example, imagine a large number of toothpicks put into a rectangular box and shaken. When you open the box, the toothpicks will be facing in about the same direction, but will have no definite spatial organization. They are free to move, but like to line up in about the same direction. This is a primitive model for nematic liquid crystals. http://www.lci.kent.edu/lc.html cning, 8/8/2007
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