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

Zheng Wang; Chao Liu; Erwen Li; Swapnajit Chakravarty; Xiaochuan Xu; Alan X. Wang; D. L. Fan; Ray T. Chen

doi:10.1117/12.2253383

17 February 2017 Guided-mode-resonance coupled localized surface plasmons for dually resonance enhanced Raman scattering sensing

Zheng Wang, Chao Liu, Erwen Li, Swapnajit Chakravarty, Xiaochuan Xu, Alan X. Wang, D. L. Fan, Ray T. Chen

Author Affiliations +

Proceedings Volume 10080, Plasmonics in Biology and Medicine XIV; 1008003 (2017) https://doi.org/10.1117/12.2253383
Event: SPIE BiOS, 2017, San Francisco, California, United States

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.

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Zheng Wang, Chao Liu, Erwen Li, Swapnajit Chakravarty, Xiaochuan Xu, Alan X. Wang, D. L. Fan, and Ray T. Chen "Guided-mode-resonance coupled localized surface plasmons for dually resonance enhanced Raman scattering sensing", Proc. SPIE 10080, Plasmonics in Biology and Medicine XIV, 1008003 (17 February 2017); https://doi.org/10.1117/12.2253383

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