Visible and near-IR range linear variable filter with two-dimensional modeling

Ko, Cheng−Hao; Tsai, Jih-Run; Wang, Bang-Ji; Lin, Shin-Fa; Hong, Chang Sun; Chiu, Wei-Huai

doi:10.1117/12.2322049

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2021

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“…However, the only way to produce a filter with arbitrary specified properties in terms of rejection, width and sharpness consists to use a standard all-dielectric approach formed with a multi-cavity Fabry-Perot structure associated with additional dielectric short and long wavelength pass blocking filters. In that case, the thickness of all the layers must be tuned by a common factor, resulting in a proportional wavelength shift, to produce a variable filter [5,6].…”

Section: Introductionmentioning

confidence: 99%

Application of static masking technique in magnetron sputtering technology for the production of linearly variable filters

et al. 2021

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Variable filters are key components for compact spectral imagers. In this paper, we present a method for the fabrication of linearly variable filters based on Bühler HELIOS machine (plasma assisted reactive magnetron sputtering). These filters are obtained by producing a variation of the thickness of all the layers of the coating, using adapted masks placed in between the sputtering targets for the low and high refractive index materials and the substrates. Variable band pass filter from 550 nm up to 1000 nm is demonstrated.

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Section: Introductionmentioning

confidence: 99%