A photonic crystal optical switch having a periodic dielectric structure including at least one input waveguide. First and second waveguide arms branch from the input waveguide in which the relative optical path lengths of electromagnetic radiation within the arms are controlled by stimuli. At least...http://www.google.com.au/patents/US6917431?utm_source=gb-gplus-sharePatent US6917431 - Mach-Zehnder interferometer using photonic band gap crystals
