The paper was published in Optics Letters

Title: Tunable Fabry–Perot interferometer operated in the terahertz range based on an effective refractive index control using pitch-variable subwavelength gratings
Authors: Ying Huang, Yangxun Liu, Taiyu Okatani, Naoki Inomata, and Yoshiaki Kanamori
Journal: Optics Letters Vol. 49, Issue 4, pp. 951-954 (2024)