Tunable multispectral narrowband absorber and directional absorption enabled by layered quasi-periodic structure and phase-change materials

•Excite the Optical Tamm States effect of the top GST material through quasi-periodic photonic crystal structure coatings.•Realize the active tunable performance of multi-spectral selective narrowband absorber.•Demonstrate the highly directional absorption of the designed coatings under S polarizati...

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Bibliographic Details
Published in:	Optics and laser technology Vol. 176; p. 110948
Main Authors:	Dong, Chao, Dong, Shi-Qing, Wang, Fang, Ke-ShengShen, Liu, Hong-Chao, Liu, Yu-Fang, Lu, Hai
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-09-2024
Subjects:	Directional absorption Infrared detection Optical Tamm States Phase-change Quasi periodicity Infrared detection Quasi periodicity Optical Tamm States Phase-change Directional absorption
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Summary:	•Excite the Optical Tamm States effect of the top GST material through quasi-periodic photonic crystal structure coatings.•Realize the active tunable performance of multi-spectral selective narrowband absorber.•Demonstrate the highly directional absorption of the designed coatings under S polarization at 75–80°. Based on the Optical Tamm States (OTS) effect of phase-change material (PCM) Ge-Sb-Te (GST), a tunable multispectral selective narrowband absorber is proposed. The application wavelength range is combined with the solar spectral distribution in this study. Compared with other absorbers with complex shapes, this planar device is easier to manufacture, making it possible for the photolithographic, large-scale, cost-effective manufacturing process. Through the phase change of GST, the multi-spectral narrowband absorption of the harmful gas SO2 (1.35 μm), NO2 (1.59 μm), NO (1.91 μm) and CO (2.1 μm) of the vehicle exhaust was finally realized. Meanwhile, it shows good directivity and polarization performance in the wavelength range of 1.7–2.0 μm, and finally high S-polarization absorptivity (>90 %) at 75–80° incident angle was achieved. The present work is of potential application value in the research areas of infrared detection, energy management, information encryption and so on.
ISSN:	0030-3992
DOI:	10.1016/j.optlastec.2024.110948