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      LIPSS for SERS: Metal coated direct laser written periodic nanostructures for surface enhanced raman spectroscopy

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      Author(s)
      Erkızan, S. N.
      İdikut, F.
      Demirtaş, Ö.
      Goodarzi, A.
      Demir, Ahmet Kemal
      Borra, M.
      Pavlov, I.
      Bek, A.
      Date
      2022-11-18
      Source Title
      Advanced Optical Materials
      Electronic ISSN
      2195-1071
      Publisher
      Wiley-VCH Verlag GmbH & Co. KGaA
      Volume
      10
      Issue
      22
      Pages
      2200233- 1 - 2200233- 11
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      A novel method of fabricating large-area, low-cost surface-enhanced Raman spectroscopy (SERS) substrates is introduced which yields densely nanostructured surfaces utilizing laser-induced periodic surface structuring (LIPSS) of crystalline silicon (Si). Two different interaction regimes yield low spatial frequency (LSFL) and high spatial frequency (HSFL) LIPSS patterns. Nanostructuring of Si surface is followed by deposition of a thin noble metal layer to complete the fabrication procedure. A 50–70 nm thick Ag layer is shown to maximize the SERS performance. The SERS effect is attributed to the electromagnetic field enhancement originating from the nanoscale surface roughness of Si that can be controlled by LSFL and HSFL nature of the structure. The SERS substrates are found to be capable of detecting a Raman analyte down to 10−11 m. SERS performance of the Ag deposited substrates at 532, 660, and 785 nm excitation wavelengths is compared. Both LSFL and HSFL Si surfaces with 70 nm thick Ag are found to exhibit the strongest SERS under 660 nm excitation exhibiting Raman enhancement factors (EFs) as high as 109. The Raman EFs are calculated both by SERS spectra experimentally, and using finite-elements method simulation of the electric field enhancement where a good agreement is found.
      Keywords
      High spatial frequency LIPSS
      Laser-induced periodic surface structures
      Low spatial frequency LIPSS
      Surface enhanced Raman spectroscopy
      Permalink
      http://hdl.handle.net/11693/111933
      Published Version (Please cite this version)
      https://dx.doi.org/10.1002/adom.202200233
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      • Department of Physics 2550
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