An article includes a substrate; and a color layer deposited on the substrate, wherein the color layer has an L* value between about 28 to about 32, an a* value between about \u22121 to about 1, and a b* value between about \u22121 to about 1 in the CIE L*a*b* color space. Various different fencing techniques can be used, and fencing mechanism can be customized. The inset center is shaped and inset to define an open cavity to closely accommodate the transponder. The method further comprises combining a returned signal received from the target with the delayed or frequency shifted local oscillator laser signal to form a combined received signal, and capturing the combined received signal with a plurality of image sensors. A method of positioning and aligning an imaging system is also provided.