A proxy system may use Layer 3 security mechanisms to establish secure communications between two devices. Instead, an operating voltage is selectively provided to the pixel’s readout circuitry, and the readout circuitry provides output signals based on charge or voltage of a storage node. The arrangement includes a feed tan having a smaller filtrate vessel positioned therein. The receiver combines small size with improved efficiency and sensitivity to provide a practical, low-cost, hand-held receiver capable of operation over distances of approximately three to five meters. In another embodiment, the P-N junction device includes a first terminal including a semiconductor layer positioned above an upper surface of a substrate and a remaining structure positioned in the substrate, the first terminal positioned over an opening in an isolation region; and a second terminal positioned over the opening in the isolation region adjacent the first terminal.