Stepwise graded refractive–index profiles for design of a narrow–bandpass filter

Xinrong Wang, Hiroshi Masumoto, Yoshihiro Someno, Lidong Chen, Toshio Hirai

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A combination of stepwise graded refractive-index profiles and a cavity structure is used for designing narrow-bandpass filters of TiO2/SiO2 multilayer films upon BK7 glass substrates. Symmetrical profiles of stepwise graded refractive indices result in high transmittance of passbands for the designed filters. The bandwidth of the narrow-bandpass filter is controlled by adjustment of parameters such as the thickness and the number of layers in the multilayer stack. This design is proposed as a new and simple method for coating synthesis of optical filters.

Original languageEnglish
Pages (from-to)3746-3752
Number of pages7
JournalApplied Optics
Issue number22
Publication statusPublished - 2001 Aug 1


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