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.
We show that the results of this research have had a great impact and interest on many researchers around the world.

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).
https://doi.org/10.1002/tee.23345