Quantitatively analysis of nonlinear/linear nanofocusing of plasmonic tips array driven via radial vector beam

Bai, D., Zhang, L., Meng, C., Xu, L. ORCID: 0000-0001-9071-4311, Gao, F. and Zhang, W., 2021. Quantitatively analysis of nonlinear/linear nanofocusing of plasmonic tips array driven via radial vector beam. Optik, 243: 167409. ISSN 0030-4026

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Abstract

Electric field enhancement of the plasmonic tip-based nanofocusing light field determines the interaction efficiency of light and matter. Herein, the nonlinear/liner nanofocusing of the plasmonic tips array (PTA) is quantitatively analyzed, under excitation of the radial vector beam (RVB) and the linear polarization beam (LPB), respectively. Second harmonic (SH) emission intensity of PTA, under ultrafast RVB excitation, has been increased 18.6 times than that of the ultrafast LPB excitation. Experimental result is coincided with the theoretical prediction of 20.5 times, revealing that PTA has better nonlinear nanofocusing under excitation of the ultrafast RVB. The linear nanofocusing is examined via surface-enhanced Raman scattering (SERS). Under continuous wave RVB excitation, Raman scattering intensity of 4-Mercaptobenzoic acid (4MBA) is increased 4.5 times than that of LPB excitation, coinciding with the theoretically calculated electric field intensity enhancement of 4.8 times. Furthermore, the linear nanofocusing of PTA is examined using Raman scattering of the monolayer graphene, revealing that the linear nanofocusing of PTA will be slightly deteriorated, when a monolayer graphene is coated on PTA. This method may be adopted as a plasmonic tip-based nanofocusing light field with significant electric field enhancement to increase the light-matter nonlinear/linear interaction efficiency.

Item Type: Journal article
Publication Title: Optik
Creators: Bai, D., Zhang, L., Meng, C., Xu, L., Gao, F. and Zhang, W.
Publisher: Elsevier BV
Date: October 2021
Volume: 243
ISSN: 0030-4026
Identifiers:
NumberType
10.1016/j.ijleo.2021.167409DOI
1446072Other
Divisions: Schools > School of Science and Technology
Record created by: Laura Ward
Date Added: 06 Apr 2022 07:58
Last Modified: 06 Apr 2022 07:58
URI: https://irep.ntu.ac.uk/id/eprint/46062

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