A planar plasmonic device includes a first material layer having a surface configured to receive at least one photon of incident light. A patterned plasmonic nanostructured layer is disposed adjacent and optically coupled to the first material layer. The patterned plasmonic nanostructured layer includes a selected one of: a) at least a portion of a surface of the patterned plasmonic nanostructured layer includes a textured surface, and b) at least one compound nanofeature including a first material disposed adjacent to a second material within the compound nanofeature.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT
 This invention was made in part with Government support under Grant Numbers NEU-0-99010-05 awarded by National Renewable Energy Laboratories (NREL); ECCS-0824091 awarded by the National Science Foundation (NSF); DE-AC36-08GO28308 awarded by the Department of Energy. The Government has certain rights in this invention.