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Abstract
Channel drop filters in a plasmon-polaritons metal are studied. It shows that light
can be efficiently dropped. Results obtained by the FDTD method are consistent with
those from coupled mode theory. It also shows, without considering the loss of the
metal, that the quality factor for the channel drop system reaches 4000. The quality
factor decreases significantly if we take into account the loss, which also leads
to a weak drop efficiency.