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25 June 2020 Spectral separation of surface-plasmon-polariton modes to achieve ultranarrow dual-band absorbers
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Abstract

We designed and studied a narrowband absorber with two absorption peaks for mid-infrared spectroscopy and multispectral detection applications. The absorber is composed of a silicon grating loaded on a continuous gold film. The grating has two silicon strips in each unit cell, with the same height but different widths. Numerical results indicate that the absorption peaks under normal incidence locate at wavelengths of ∼3.863 and ∼4.004  μm, with bandwidths of ∼28 and ∼33  nm, respectively. Both peaks exhibit high absorptivities of >0.996. We found that the excited surface-plasmon-polariton modes traveling in different directions in the structure are spectrally separated and result in the two absorption peaks.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 1934-2608/2020/$28.00 © 2020 SPIE
Xin He, Jinliang Jie, Junbo Yang, Yunxin Han, and Sen Zhang "Spectral separation of surface-plasmon-polariton modes to achieve ultranarrow dual-band absorbers," Journal of Nanophotonics 14(2), 026020 (25 June 2020). https://doi.org/10.1117/1.JNP.14.026020
Received: 24 March 2020; Accepted: 15 June 2020; Published: 25 June 2020
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