A Route to Unusually Broadband Plasmonic Absorption Spanning from Visible to Mid-infrared
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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 varying from 478 to 3278 nm that yields an ultra-wide band with the width of 2800 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 yielding 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. This makes it rather promising for practical applications.
KeywordsLocalized surface plasmons Nanodisk array Impedance matching Guided-mode resonance
Ekmel Ozbay acknowledges partial support from the TUBA. Amin Khavasi also acknowledges Research Office of Sharif University of Technology.
Narodowe Centrum Nauki (NCN), Poland (DEC-2015/17/B/ST3/00118–Metasel); Turkish Academy of Sciences (TUBA); Research Office of Sharif University of Technology.
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