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Lithography-Free random bismuth nanostructures for full solar spectrum harvesting and mid-infrared sensing
Date
2019-12
Author
Soydan, Mahmut Can
Ghobadi, Amir
Yıldırım, Deniz Umut
Duman, Elif Sarıgül
Bek, Alpan
Ertürk, Vakur Behçet
Özbay, Ekmel
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A lithography-free, double-functional single bismuth (Bi) metal nanostructure is designed, fabricated, and characterized for ultrabroadband absorption in the visible (vis) and near-infrared (NIR) ranges, and for a narrowband response with ultrahigh refractive index sensitivity in the mid-infrared (MIR) range. To achieve a large-scale fabrication of the design in a lithography-free route, the oblique-angle deposition approach is used to obtain densely packed and randomly spaced/oriented Bi nanostructures. It is shown that this fabrication technique can provide a bottom-up approach to controlling the length and spacing of the design. The characterization findings reveal a broadband absorbance above 0.8 in vis and NIR, and a narrowband absorbance centered around 6.54 mu m. Dense architecture and extraordinary permittivity of Bi provide strong field confinement in ultrasmall gaps between nanostructures, and this can be utilized for a sensing application. An ultrahigh sensitivity of 2151 nm refractive-index unit (RIU-1) is acquired, which is, as far as it is known, the experimentally highest sensitivity attained so far. The simple and large-scale compatible fabrication route of the design together with the extraordinary optical response of Bi coating makes this design promising for many optoelectronic and sensing applications.
Subject Keywords
Bismuth
,
Broadband absorbers
,
Lithography‐free fabrication
,
Narrowband absorbers
,
Ultrahigh sensitivity
URI
https://hdl.handle.net/11511/28646
Journal
10.1002/adom.201901203
DOI
https://doi.org/10.1002/adom.201901203
Collections
Department of Physics, Article
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M. C. Soydan et al., “Lithography-Free random bismuth nanostructures for full solar spectrum harvesting and mid-infrared sensing,”
10.1002/adom.201901203
, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28646.