Guided-Mode Resonance Grating with Self-Assembled Silver Nanoparticles for Surface-Enhanced Raman Scattering Spectroscopy

Photonics

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.