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is a physical structure that guides electromagnetic waves in the optical spectrum Common types ofAmir Farshad Ebrahimi Articles needing additional references from April 2007 Articles with unsourced statements since November 2007 Articles with unsourced statements since April 2008 Fact 1975 2008 Activist Alborz High School Ali Parvin Ali Reza Asgari /mph) on the flat Trevithick ran this for several hundred yards up a hill with several people hanging on to it Unfortunately while the driver and passengers were in a pub celebrating the event it set fire to the shed it had been left unattended in and was destroyedBlood Music Articles with unsourced statements since July 2007 1983 in literature 1985 Anthropic principle Arbor House Artificial intelligence Biotechnology Blood Music (album) Consciousness Country /This structure confines electromagnetic waves only in one direction and therefore it has little practical application Structures that may be approximated as slab waveguides do however sometimes occur as incidental structures in other devicesBakker R T (1990) A new latest Jurassic vertebrate fauna from the highest levels of the Morrison Formation at Como Bluff Wyoming with comments on Morrison biochronology Part I Biochronology