Patent ID: 8779483

Claim:
A plasmonic image pixel for gathering light in a first frequency range and light in a second frequency range, comprising: a p-type semiconductor layer having a surface; and a patterned metal layer formed on the surface of the p-type semiconductor layer, wherein the patterned metal layer has a first region including first openings and a second region including second openings, wherein the first region of the patterned metal layer comprises a plurality of metal portions, wherein each metal portion in the plurality of metal portions has a first lateral width, wherein each of the first openings has a second lateral width, wherein the first lateral width is substantially equal to the second lateral width, wherein the patterned metal layer is configured to use plasmons to direct the light in the first frequency range and not light in the second frequency range into the first openings and to direct the light in the second frequency range and not light in the first frequency range into the second openings, and wherein a given one of the first openings is completely surrounded by four metal portions of the plurality of metal portions.