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Proceedings Paper

Guided-mode-resonance coupled localized surface plasmons for dually resonance enhanced Raman scattering sensing
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Paper Abstract

Raman scattering spectroscopy is a unique tool to probe vibrational, rotational, and other low-frequency modes of a molecular system and therefore could be utilized to identify chemistry and quantity of molecules. However, the ultralow efficient Raman scattering, which is only 1/109 ~ 1/1014 of the excitation light due to the small Raman scattering cross-sections of molecules, have significantly hindered its development in practical sensing applications. The discovery of surface-enhanced Raman scattering (SERS) in the 1970s and the significant progress in nanofabrication technique, provide a promising solution to overcome the inherent issues of Raman spectroscopy. It is found that In the vicinity of nanoparticles and their junctions, the Raman signals of molecules can be significantly improved by an enhancement factor as high as 1010, due to the ultrahigh electric field generated by the localized surface plasmons resonance (LSPR), where the intensity of Raman scattering is proportional to the |E|4. In this work, we propose and demonstrate a new approach combining LSPR from nanocapsules with densely assembled silver nanoparticles (NC-AgNPs) and guidemode- resonance (GMR) from dielectric photonic crystal slabs (PCSs) for SERS substrates with robustly high performance.

Paper Details

Date Published: 17 February 2017
PDF: 7 pages
Proc. SPIE 10080, Plasmonics in Biology and Medicine XIV, 1008003 (17 February 2017); doi: 10.1117/12.2253383
Show Author Affiliations
Zheng Wang, The Univ. of Texas at Austin (United States)
Chao Liu, The Univ. of Texas at Austin (United States)
Erwen Li, Oregon State Univ. (United States)
Swapnajit Chakravarty, Omega Optics, Inc. (United States)
Xiaochuan Xu, Omega Optics, Inc. (United States)
Alan X. Wang, Oregon State Univ. (United States)
D. L. Fan, The Univ. of Texas at Austin (United States)
Ray T. Chen, The Univ. of Texas at Austin (United States)
Omega Optics, Inc. (United States)

Published in SPIE Proceedings Vol. 10080:
Plasmonics in Biology and Medicine XIV
Tuan Vo-Dinh; Joseph R. Lakowicz, Editor(s)

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