A sensor device includes a substrate having first and second regions of first and second conductivity types, respectively. A junction having a band-gap is formed between the first and second regions. A plasmon source generates plasmons having fields. At least a portion of the plasmon source is formed...http://www.google.de/patents/US7586167?utm_source=gb-gplus-sharePatent US7586167 - Detecting plasmons using a metallurgical junction
