High‐performance integrated mid‐infrared filter arrays. Issue 23 (3rd October 2022)

• Record Type: Journal Article
• Authors: Hakkel, Kaylee D.; van Elst, Don M.J.; Petruzzella, Maurangelo; Ebermann, Martin; Pagliano, Francesco; van Klinken, Anne; Fiore, Andrea
• Is Part Of: Electronics letters. Volume 58:Issue 23(2022)
• Page Start: 884
• Page End: 886
• Publication Date: 2022-10-03
• Subjects: Electronics -- Periodicals; 621.381
• DOI: 10.1049/ell2.12626
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract: A static filter array is developed based on Fabry–Perot cavities operating in the mid‐infrared range from 2 to 4.5 µm, matching the absorption region of several gases relevant for air quality monitoring. The filters include two distributed Bragg reflectors and a high‐index tuning element with varying thickness in between. The filters display high peak transmittance ( > 80 % $>80\%$ ) and controllable peak width. The robustness, ease of fabrication and the possibility to tune the optical response to a specific application make the integrated filter arrays suitable for compact sensing systems.