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arXiv · 1810.07139

A Route to Unusually Broadband Absorption Spanning from Visible to Mid-Infrared

Majid Aalizadeh·Amin Khavasi·Andriy E. Serebryannikov·Guy A. E. Vandenbosch·Ekmel Ozbay
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Abstract

In this paper, a route to ultra-broadband absorption is suggested and demonstrated by a feasible design. The high absorption regime (absorption above 90%) for the suggested structure ranges from visible to mid-infrared (MIR), i.e. for the wavelength from 478 to 3,278 nm that yields an ultra-wide bandwidth of 2,800 nm. The structure consists of a top-layer-patterned metal-insulator-metal (MIM) configuration, into the insulator layer of which, an ultra-thin 5 nm layer of Manganese (Mn) is embedded. The MIM configuration represents a Ti-Al2O3-Ti tri-layer. It is shown that, without the ultra-thin layer of Mn, the absorption bandwidth is reduced to 274 nm. Therefore, adding only a 5 nm layer of Mn leads to a more than tenfold increase in the width of the absorption band. It is explained in detail that the physical mechanism contributing to this ultra-broadband result is a combination of plasmonic and non-plasmonic resonance modes, along with the appropriate optical properties of Mn. This structure has the relative bandwidth (RBW) of 149%, while only one step of lithography is required for its fabrication, so it is relatively simple to fabricate. This makes it rather promising for practical applications.

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BibTeXRIS

Majid Aalizadeh, Amin Khavasi, Andriy E. Serebryannikov, Guy A. E. Vandenbosch, Ekmel Ozbay. 2018-10-16. A Route to Unusually Broadband Absorption Spanning from Visible to Mid-Infrared. https://arxiv.org/abs/1810.07139

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