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      Thermally tunable ultrasensitive infrared absorption spectroscopy platforms based on thin phase-change films

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      Author(s)
      Bakan, G.
      Ayas S.
      Ozgur E.
      Celebi, K.
      Dana, A.
      Date
      2016-11
      Source Title
      ACS Sensors
      Print ISSN
      2379-3694
      Publisher
      American Chemical Society
      Volume
      1
      Issue
      12
      Pages
      1403 - 1407
      Language
      English
      Type
      Article
      Item Usage Stats
      191
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      315
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      Abstract
      The thermal tunability of the optical and electrical properties of phase-change materials has enabled the decades-old rewritable optical data storage and the recently commercialized phase-change memory devices. Recently, phase-change materials, in particular, Ge2Sb2Te5 (GST), have been considered for other thermally configurable photonics applications, such as active plasmonic surfaces. Here, we focus on nonplasmonic field enhancement and demonstrate the use of the phase-change materials in ultrasensitive infrared absorption spectroscopy platforms employing interference-based uniform field enhancement. The studied structures consist of patternless thin GST and metal films, enabling simple and large-area fabrication on rigid and flexible substrates. Crystallization of the as-fabricated amorphous GST layer by annealing tunes (redshifts) the field-enhancement wavelength range. The surfaces are tested with ultrathin chemical and biological probe materials. The measured absorption signals are found to be comparable or superior to the values reported for the ultrasensitive infrared absorption spectroscopy platforms based on plasmonic field-enhancement.
      Keywords
      GeSbTe
      Infrared absorption spectroscopy
      Interference coatings
      Phase-change
      Sensing
      Permalink
      http://hdl.handle.net/11693/36712
      Published Version (Please cite this version)
      https://doi.org/10.1021/acssensors.6b00591
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      • Institute of Materials Science and Nanotechnology (UNAM) 2260
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