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Design and Fabrication of a Narrow Bandpass Filter with Low Dependence on Angle of Incidence

Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 106, Taiwan
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Coatings 2018, 8(7), 231; https://doi.org/10.3390/coatings8070231
Received: 31 May 2018 / Revised: 23 June 2018 / Accepted: 27 June 2018 / Published: 29 June 2018
(This article belongs to the Special Issue Design, Manufacturing and Measurement of Optical Film Coatings)
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Abstract

A multilayer narrow bandpass filter that consists of silver and silicon thin films is designed using the admittance tracing method. Owing to the low loss of silicon in the infrared range, the peak transmittance at a wavelength of 950 nm exceeds 85%. To eliminate the sidebands that are adjacent to the passband, a compact four-layered structure is proposed to generate an angle-insensitive spectrum. In fabrication, a silver-silicon multilayer is deposited to approach the design. View Full-Text
Keywords: interference coatings; multilayer design; spectral properties interference coatings; multilayer design; spectral properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jen, Y.-J.; Lin, M.-J. Design and Fabrication of a Narrow Bandpass Filter with Low Dependence on Angle of Incidence. Coatings 2018, 8, 231.

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