The invention provides a photonic structure comprising a first region (3) formed from a material having a first refractive index; and an array of sub-regions (5) formed in the first region, each sub-region having a refractive index different to the first refractive index; wherein...http://www.google.de/patents/US20050094956?utm_source=gb-gplus-sharePatent US20050094956 - Photonic band structure devices
