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      Deep subwavelength light confinement in disordered bismuth nanorods as a linearly thermal‐tunable metamaterial

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      Embargo Lift Date: 2021-07-01
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      Author(s)
      Soydan, Mahmut Can
      Ghobadi, Amir
      Yıldırım, Deniz Umut
      Ertürk, Vakur Behçet
      Özbay, Ekmel
      Date
      2020
      Source Title
      Physica Status Solidi - Rapid Research Letters
      Print ISSN
      1862-6254
      Publisher
      Wiley-VCH Verlag
      Volume
      14
      Issue
      7
      Pages
      2000066-1 - 2000066-6
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Materials with a tunable optical response that can be controllably tailored using external stimuli excitation have undergone considerable research effort for the development of active optical devices, such as thermo‐optical modulators. Although bismuth (Bi) nanodots, embedded into glass matrices, have been proven to have a thermo‐optical response, the recyclability of the structure in solid–liquid phase transitions is a major challenge. Herein, a facile and lithography‐free fabrication method is proposed to realize densely packed stand‐alone Bi nanorods (NRs), with deep subwavelength gaps and a resonance at the midinfrared range (λ ≅ 4.462 μm). Owing to these ultrasmall gaps that support lossy Mie‐like resonances, strong field confinement is achieved, and the resonance wavelength exhibits great sensitivity to temperature, as the thermal sensitivity reaches as high as 1.0316 nm °C−1. This operation is conducted in the moderate temperature interval of 25–85 °C, which is far from the melting point of Bi. Overall, our simple, robust, and high‐performance device is highly promising for realizing optical switches, thermo‐optic modulators, and infrared camouflage.
      Keywords
      Bismuth
      Lithography-free
      Metamaterials
      Thermally-tunable
      Permalink
      http://hdl.handle.net/11693/75829
      Published Version (Please cite this version)
      https://dx.doi.org/10.1002/pssr.202000066
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
      • Nanotechnology Research Center (NANOTAM) 1179
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