Mechanisms for one-dimensional photon sorting are theoretically studied inthe framework of a couple mode method. The considered system is a nanopatternedstructure composed of two different pixels drilled on the surface of a thingold layer. Each pixel consists of a slit-groove array designed to squeeze alarge fraction of the incident light into the central slit. The Double-Pixel isoptimized to resolve two different frequencies in the near infrared. Thissystem shows a high transmission efficiency and a small crosstalk. Its responseis found to strongly depend on the effective area shared by overlapping pixels.Three different regimes for the process of photon sorting are identified andthe main physical trends underneath in such regimes are unveiled. Optimalefficiencies for the photon sorting are obtained for a moderate number ofgrooves that overlap with grooves of the neighbor pixel. Results could beapplied to optical and infrared detectors.
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