Side-channel photonic crystal fiber for surface enhanced Raman scattering sensing

Side-channel photonic crystal fiber for surface enhanced Raman scattering sensing
Title:
Side-channel photonic crystal fiber for surface enhanced Raman scattering sensing
Other Titles:
Sensors and Actuators B: Chemical
Keywords:
Publication Date:
21 September 2015
Citation:
Nan Zhang, Georges Humbert, Tianxun Gong, Perry Ping Shum, Kaiwei Li, Jean-Louis Auguste, Zhifang Wu, Dora Juan Juan Hu, Feng Luan, Quyen Xuan Dinh, Malini Olivo, Lei Wei, Side-channel photonic crystal fiber for surface enhanced Raman scattering sensing, Sensors and Actuators B: Chemical, Volume 223, February 2016, Pages 195-201, ISSN 0925-4005, http://dx.doi.org/10.1016/j.snb.2015.09.087.
Abstract:
A side-channel photonic crystal fiber (SC-PCF) is proposed and fabricated to serve as a high sensitivity surface enhanced Raman scattering (SERS) sensing platform. The SC-PCF has a solid core with triangular lattice cladding structure, and one third of the cladding is removed intentionally to enable fast liquid infiltration and enlarge effective interaction area between liquid samples and the fiber core guided lightwave. The geometry of the SC-PCF is designed to obtain high evanescent field power in cladding side-channel, high free space coupling efficiency and low transmission loss at the excitation wavelength of 632.8 nm. Rhodamine 6G (R6G) solutions mixed with gold nanoparticles (AuNPs) are used to test the SERS performance of the proposed platform. A low detection limit of 50 fM R6G solution is achieved. Moreover, an accumulative effect of SERS signal along the SERS-active fiber length is demonstrated experimentally, and a numerical–analytical model for backward scattering scheme is developed to investigate the dependence of Raman intensity on fiber length.
License type:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Funding Info:
This work is partially supported by the Singapore Ministry ofEducation Academic Research Fund Tier 2 (MOE2015-T2-1-066 andMOE2014-T2-1-076), MINDEF-NTU-JPP/15/01/02, NTU ResearchStudent Scholarship (RSS), and MERLION PhD project. We alsosincerely appreciate funding support from Nanyang TechnologicalUniversity (Startup grant: Lei Wei).
Description:
ISSN:
0925-4005
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