Patent ID: 7456383

Claim:
A wavelength separation device comprising: a metal film or a plurality of metal islands having a plurality of openings having a width that is less than at least one first predetermined wavelength of incident radiation to be provided onto the film or the islands; wherein: the metal film or islands are configured such that the incident radiation is resonant with at least one plasmon mode on the metal film or metal islands; transmission of radiation having at least a second peak wavelength and a third peak wavelength different from the second peak wavelength is enhanced through the plurality of openings in the metal film or the plurality of metal islands due to the resonance with the at least one plasmon mode; the metal film or metal islands comprise at least two cells; a first period of first openings in the first cell is different than a second period of second openings in a second cell; a transmission of the radiation having the second peak wavelength through the first openings in the first cell is enhanced due to the first period; and a transmission of the radiation having the third peak wavelength through the second openings in the second cell is enhanced due to the second period.