An improved transmitting multi-layer thin-film filter
Zhang Yinga),b), Qi Hong-Jia), Yi Kuia), Wang Yan-Zhia), Sui Zhanc), Shao Jian-Daa)†
       
(a) Transmission and (b) angular spectra of short and long wave-pass cutoff filter-combination device with a period number of 35 and an oblique angle of incidence of 45° after local optimization.