A method for characterizing a polariton wave within a material includes: generating the polariton wave; and imaging the polariton wave with optical radiation to produce a spatially-resolved image of portions of the optical radiation affected by the polariton wave. The method can be used to identify inhomogeneities...http://www.google.es/patents/US6356349?utm_source=gb-gplus-sharePatente US6356349 - Polariton wave imaging
