An improved transmitting multi-layer thin-film filter
Zhang Yinga),b), Qi Hong-Jia), Yi Kuia), Wang Yan-Zhia), Sui Zhanc), Shao Jian-Daa)†
       
Electric field distributions of transmitting phase-shift Rugate thin film filters with different period numbers ( n = 20, 25, 30, 35) at oblique angles of incidence (30°, 45°, and 60°).