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<p>In the present report, we have investigated SERS (surface enhanced Raman scattering) from rhodamine-6G (R6G) and melamine using gold nanoparticles (GNP) in plasmonic microhole cavity metasurface (MCM). A plasmonic square array of microhole cavity metasurface is fabricated using maskless optical lithography followed by thermal evaporation of gold. The water solution of R6G and GNP is prepared and drop casted onto plasmonic MCM to detect effective SERS. Similarly, SERS from the water solution of melamine and GNP is detected. Experimental results show a reproducible SERS with a high limit of detection (LOD) down to ~ 10 × 10<sup>−6</sup> molar (10 μM) for R6G and 1 × 10<sup>−9</sup> molar (1 nM) for melamine. Strong localized surface plasmon resonance (LSPR) and cavity mode assisted near-fields lead to such enhancement (&gt; 10<sup>5</sup>, with respect to flat glass substrate). To support our finding, we have computed plasmonic MCM and GNP at excited Raman wavelength (785 nm) using FDTD (finite difference time domain) technique. Computed results show enhanced near-fields caused by localized and propagating surface plasmon, and cavity mode that have led to enhanced SERS signal. Our results demonstrate the potential of GNP in plasmonic MCM for sensitive SERS detection of R6G and melamine in the area of food and health safety.</p>

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Gold Nanoparticles in Plasmonic Metasurface Cavity Assisted SERS Detection of R6G and Melamine

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Urvashi Solanki,
  • Shraddha Shukla,
  • Akanksha Yadav,
  • Anil K. Yadav,
  • Amit K. Agarwal,
  • P. Mandal

摘要

In the present report, we have investigated SERS (surface enhanced Raman scattering) from rhodamine-6G (R6G) and melamine using gold nanoparticles (GNP) in plasmonic microhole cavity metasurface (MCM). A plasmonic square array of microhole cavity metasurface is fabricated using maskless optical lithography followed by thermal evaporation of gold. The water solution of R6G and GNP is prepared and drop casted onto plasmonic MCM to detect effective SERS. Similarly, SERS from the water solution of melamine and GNP is detected. Experimental results show a reproducible SERS with a high limit of detection (LOD) down to ~ 10 × 10−6 molar (10 μM) for R6G and 1 × 10−9 molar (1 nM) for melamine. Strong localized surface plasmon resonance (LSPR) and cavity mode assisted near-fields lead to such enhancement (> 105, with respect to flat glass substrate). To support our finding, we have computed plasmonic MCM and GNP at excited Raman wavelength (785 nm) using FDTD (finite difference time domain) technique. Computed results show enhanced near-fields caused by localized and propagating surface plasmon, and cavity mode that have led to enhanced SERS signal. Our results demonstrate the potential of GNP in plasmonic MCM for sensitive SERS detection of R6G and melamine in the area of food and health safety.