@prefix sampledescriptionvocabulary1: <https://purls.helmholtz-metadaten.de/skosmos/sdv/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ns0: <http://server/unset-base/> .

sampledescriptionvocabulary1:PhotonicCrystal
  skos:prefLabel "Photonic crystal" ;
  skos:definition "A photonic crystal is an optical nanostructure in which the refractive index changes periodically. This affects the propagation of light in the same way that the structure of natural crystals gives rise to X-ray diffraction and that the atomic lattices (crystal structure) of semiconductors affect their conductivity of electrons. Photonic crystals occur in nature in the form of structural coloration and animal reflectors, and, as artificially produced, promise to be useful in a range of applications. (Wikipedia)"^^ns0:None ;
  skos:broader sampledescriptionvocabulary1:MaterialType ;
  a skos:Concept .

sampledescriptionvocabulary1:MaterialType
  skos:prefLabel "Material type" ;
  a skos:Concept ;
  skos:narrower sampledescriptionvocabulary1:PhotonicCrystal .