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

Jing Yang; Fanghui Ren; Xinyuan Chong; Donglei Fan; Swapnajit Chakravarty; Zheng Wang; Ray T. Chen; Alan X. Wang

doi:10.3390/photonics1040380

Photonics (Oct 2014)

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

Jing Yang,
Fanghui Ren,
Xinyuan Chong,
Donglei Fan,
Swapnajit Chakravarty,
Zheng Wang,
Ray T. Chen,
Alan X. Wang

Affiliations

Jing Yang: School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331, USA
Fanghui Ren: School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331, USA
Xinyuan Chong: School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331, USA
Donglei Fan: Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
Swapnajit Chakravarty: Omega Optics, Inc., Austin, Texas 78757, USA
Zheng Wang: Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78758, USA
Ray T. Chen: Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78758, USA
Alan X. Wang: School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331, USA

DOI: https://doi.org/10.3390/photonics1040380
Journal volume & issue: Vol. 1, no. 4
pp. 380 – 389

Abstract

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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.

Published in Photonics

ISSN: 2304-6732 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: http://www.mdpi.com/journal/photonics

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