guided-mode resonance grating with self-assembled silver nanoparticles for surface-enhanced raman scattering spectroscopy
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2014
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Abstract
We designed and fabricated guided-mode resonance (GMR) gratings on indium-tin-oxide (ITO) thin film to generate a significantly enhanced local electric field for surface-enhanced Raman scattering (SERS) spectroscopy. Ag nanoparticles (NPs) were self-assembled onto the surface of the grating, which can provide a large amount of “hot-spots” for SERS sensing. The ITO gratings also exhibit excellent tolerance to fabrication deviations due to the large refractive index contrast of the ITO grating. Quantitative experimental results of 5,5’-dithiobis(2-nitrobenzoic acid) (DTNB) demonstrate the best enhancement factor of ~14× on ITO gratings when compared with Ag NPs on a flat ITO film, and the limit of detection (LOD) of DTNB is as low as 10 pM.
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yang2014photonicsguided-mode
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| Authors | ;Jing Yang;Fanghui Ren;Xinyuan Chong;Donglei Fan;Swapnajit Chakravarty;Zheng Wang;Ray T. Chen;Alan X. Wang |
| Journal | pakistan journal of medical sciences |
| Year | 2014 |
| DOI |
10.3390/photonics1040380
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