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Patterned Dichroic Filters - Multiple Spectral Filters on a Single Component

Multispectral image sensors require cover glass lids with integrated color-selective dichroic filters. Materion Balzers Optics provides patterned color filters for the selective spectral filtering for different zones of cover glass lids. Such dichroic filters may include RGB, NIR, and PAN filters or monochrome UV or IR filters. Materion Balzers Optics offers different processes for arranging several spectral filters next to each other on one single component.

Monolithic Design (up to Eight Filters)

It is possible to arrange various optical filter coatings on one common substrate by using a sophisticated photolithography technique or vapor shadow masks. There are hardly any constraints concerning the geometric shape of the individual filters, which makes it fairly easy to take customer requirements into consideration. Plasma-assisted deposition of the dielectric layers guarantees high-performance filter characteristics with long-term stability.

Individual filter zones may be masked with an opaque (black) chrome layer.

Schematic of Monolithic Design

Assembly with Individual Filter Strips Arranged Next to Each Other

In applications with more than eight filter strips arranged next to each other or with extensive spectral requirements (such as a broad range of blocking wavelengths or high transmission in narrow wavelength ranges), the filters may be coated individually and subsequently put together in one assembly. Advantages of this procedure include the strict separation of the filters without crosstalk or bleed, good environmental stability for applications in extreme conditions, or even the combination of filters with challenging spectral properties in a single component.

Schematic of Assembly with Individual Filter Strips