The following paper has been certified as “Top Downloaded Article 2021” and received the certificate.

The following paper published in the journal "IEEJ Transactions on Electrical and Electronic Engineering" was one of the most downloaded papers published between January 1, 2021 and December 31, 2021.
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Yoshiaki Kanamori,
“(Invited Review Paper) High-Efficiency Optical Filters Based on Nanophotonics,”
IEEJ Transactions on Electrical and Electronic Engineering, vol. 16, no. 5, pp. 662-672 (2021).