Angle-insensitive and solar-blind ultraviolet bandpass filter

Sangsik Kim, Mengren Man, Minghao Qi, Kevin J. Webb

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

We present a metal-dielectric stack ultraviolet (UV) bandpass filter that rejects the longer wavelength, visible spectrum and is thin and relatively insensitive to the angle of incidence. Parametric evaluations of the reflection phase shift at the metal-dielectric interface provide insight and design information. This nontrivial phase shift allows coupled Fabry-Perot resonances with subwavelength dielectric film thickness. Furthermore, the total phase shift, with contributions from wave propagation and nontrivial reflection phase shift, is insensitive to the angle of incidence. Filter passbands in the UV can be shifted to visible or longer wavelengths by engineering the dielectric thickness and selecting a metal with an appropriate plasma frequency.

Original languageEnglish
Pages (from-to)5784-5787
Number of pages4
JournalOptics Letters
Volume39
Issue number19
DOIs
StatePublished - Oct 1 2014

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