Abstract

In this paper, we propose and numerically investigate a novel concept for a mid-infrared bandpass filter based on a single stepwise linearly chirped Bragg grating, which can be used to create narrowband emitters in the mid-infrared region. We devised the filter on a silicon platform for a transmission wavelength of 4.26 μm, which can be used for carbon dioxide sensing. In order to comply with industrial design rules, we limited the resolution of the design grid to $\text{1 nm}$ , which made it necessary to repeat each individual grating pitch in order to optimize the performance. The devised filter features a transmission band of $\text{100 nm}$ , tailored to the absorption band of carbon dioxide, in combination with a spectrally broad rejection band.

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