Multiband absorbers for the long-wave infrared regime

Applied Optics
Victoria A Carey, M Mirotznik

Abstract

We present the development of a long-wave infrared regime multiband absorption filter with simultaneous wavelength and intensity selectivity. The approach employs a technique we call "spectral dithering" to place single-band absorbing pixels across a unit cell such that their weighted sum describes a multiband absorption spectrum. The number of absorption bands is proportional to the number of unique pixels present. Pixel patterning controls wavelength selectivity, whereas pixel distribution controls intensity selectivity. Using the rigorous coupled-wave method for modelling, a filter with three absorption bands between 6 and 14 μm is designed using the spectral dithering technique. The device is fabricated and experimentally verified using Fourier-transform infrared spectroscopy.

References

Jun 14, 2006·Optics Letters·Yuyan WangJoseph J Talghader
Nov 18, 2010·Optics Letters·Thomas Maier, Hubert Brueckl
Feb 26, 2016·Optics Express·N Pelin AyerdenReinoud F Wolffenbuttel

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