A polymeric matrix material exhibits low loss at optical frequencies and facilitates the fabrication of all-dielectric metamaterials. The light weight high strength particles of the invention are basically comprised of sintered mixtures of a base material and hollow microspheres. The memory stores a message agreed to between the buyer and seller representing a payment plan and deliverable plan. Calculating differential between a current component in a detecting period and an offset current, which is the current component in a resetting period in sampling, allows an offset component included in the pixel signal to be removed and only pure signal Isig to be picked up at an output terminal Iout, so that the FPN restraining function can be fulfilled.