Abstract
Gap mode surface-enhanced Raman spectroscopy (SERS) enables high enhancement of Raman signal. However, the polarization of excitation light shows great influence on the excitation of gap mode and hence on the Raman enhancement. Here, we propose a nanoparticle-on-film gap mode SERS accompanying with a new type of excitation source called as perfect radially polarized (PRP) beam. The PRP beam possesses a ring-shaped beam pattern that can be tuned to match the surface plasmon resonance angle under a tight focusing condition, hence improving greatly the excitation efficiency of surface plasmon polaritons, and eventually the sensitivity of gap mode SERS. Such kind of enhanced-Raman system with a PRP beam has a great potential on the applications such as single molecule Raman detection.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China under Grant Nos. 61427819, 61490712, 61622504, 11504244; National Key Basic Research Program of China (973) under grant No. 2015CB352004; Science and Technology Innovation Commission of Shenzhen under grant nos. KQTD2015071016560101, KQCS2015032416183980, KQCS201532416183981; the leading talents of Guangdong province program no. 00201505 and the Natural Science Foundation of Guangdong Province under No. 2016A030312010; A. Yang acknowledges the Innovation and Development Fund for postgraduates in Shenzhen university.
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Yang, A., Du, L., Dou, X. et al. Sensitive Gap-Enhanced Raman Spectroscopy with a Perfect Radially Polarized Beam. Plasmonics 13, 991–996 (2018). https://doi.org/10.1007/s11468-017-0597-y
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DOI: https://doi.org/10.1007/s11468-017-0597-y