Optimizing thin-film material combinations for immersed narrow-bandpass filters in the VIS and NIR range

Rico Benz; Maryam Nazari; Tatiana Amochkina; Michael Trubetskov

doi:10.1117/12.3016993

24 June 2024 Optimizing thin-film material combinations for immersed narrow-bandpass filters in the VIS and NIR range

Rico Benz, Maryam Nazari, Tatiana Amochkina, Michael Trubetskov

Proceedings Volume 13020, Advances in Optical Thin Films VIII; 1302006 (2024) https://doi.org/10.1117/12.3016993
Event: SPIE Optical Systems Design, 2024, Strasbourg, France

Abstract

Narrow bandpass filters featuring broadband blocking ranges find extensive applications in spectroscopy, imaging, illumination, distance measurements, remote sensing, space and earth observations. The interest in bandpass filters with low angular shift is permanently growing; but as narrow filter width and large angular fields are inherently conflicting requirements, researchers explore various approaches to reduce this shift. We develop immersed bandpass filters exhibiting (i) a narrow high transmittance range at 825-875 nm, (ii) blocking ranges at 200-780 nm and 900-1100 nm, and (iii) low blue shift for angles of incidence up to 25°. However, the design solution should also allow for the possibility of shifting the transmission range further into the visible or near-infrared regions. Due to the immersed nature of the filter, it is difficult to effectively address such a complex task using two materials only; at least three materials should compose the coating. To provide an ultra-broadband blocking range, absorbing thin film materials should be involved. At the same time, these materials should be transparent outside of this range to maintain the high transmittance. Therefore, in the design process, a balanced compromise should be found. Not all theoretical solutions or/and materials combinations can be realized due to limitations of the production tools. The monitoring concept as well as design robustness should be considered; the number of layers cannot be very high. Double-sided optical elements composed as front side filter and back side blocker hold promise in this regard. The solutions are oriented at Ion Beam Sputtering deposition technique, not equipped with load lock solution.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Rico Benz, Maryam Nazari, Tatiana Amochkina, and Michael Trubetskov "Optimizing thin-film material combinations for immersed narrow-bandpass filters in the VIS and NIR range", Proc. SPIE 13020, Advances in Optical Thin Films VIII, 1302006 (24 June 2024); https://doi.org/10.1117/12.3016993

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