An optical switch which uses internal reflection at a junction formed by two waveguides is discussed. The waveguides may be formed from various materials such as polymers and other combinations of monomers. Substantially total internal reflection may be produced at the junction between the two waveguides...http://www.google.de/patents/US20020085794?utm_source=gb-gplus-sharePatent US20020085794 - NxN optical switching device based on thermal optic induced internal reflection effect
