Abstract

A theory of light reflection and transmission by an optically thin nanocomposite slab that contains randomly distributed metal nanoparticles (NPs) is developed. The underlying model treats NPs as point dipoles and employs a dyadic Green’s function known analytically for a slab that allows one to obtain the refection and transmission coefficients in a fully analytical form. The model also takes into account the enhanced decay of localized surface plasmons in dense NP arrays and light scattering at the slab surface roughness. It is demonstrated that the first effect leads to broadband perfect absorption observed in such nanocomposites, whereas the second one is responsible for its omnidirectional character and polarization insensitivity. These findings open up new possibilities to engineer broadband perfect absorption in plasmonic nanocomposites.

© 2021 Optical Society of America

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References

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Data Availability

Data underlying the results presented in this paper are available in Ref. [15].

15. M. K. Hedayati, M. Javaherirahim, B. Mozooni, R. Abdelaziz, A. Tavassolizadeh, V. S. K. Chakravadhanula, V. Zaporojtchenko, T. Strunkus, F. Faupel, and M. Elbahri, “Design of a perfect black absorber at visible frequencies using plasmonic metamaterials,” Adv. Mater. 23, 5410–5414 (2011). [CrossRef]  

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Equations (65)

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