Photonics | |
Guided-Mode Resonance Grating with Self-Assembled Silver Nanoparticles for Surface-Enhanced Raman Scattering Spectroscopy | |
Jing Yang1  Fanghui Ren1  Xinyuan Chong1  Donglei Fan3  Swapnajit Chakravarty2  Zheng Wang4  Ray T. Chen4  | |
[1] School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331, USA; E-Mails:;Omega Optics, Inc., Austin, Texas 78757, USA; E-Mail:;Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA; E-Mail:;Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78758, USA; E-Mails: | |
关键词: surface-enhanced Raman scattering; grating; silver nanoparticles; self-assembling; guided-mode resonance; | |
DOI : 10.3390/photonics1040380 | |
来源: mdpi | |
【 摘 要 】
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.
【 授权许可】
CC BY
© 2014 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
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