廖莎莎, 黄琮, 冯玉婷, 张伍浩, 赵帅, 刘真伟 - Acta Optica Sinica, 2023 - researching.cn
… Ultracompact bandwidthtunable filter based on subwavelength grating-assisted contradirectional …
Therefore, it is of great practical significance to study the contra-directional coupling …