Open AccessNanofocusing of a metallized double periodic arranged nanocone array for surface-enhanced Raman spectroscopy
Author(s) -
Lu Zhang,
Chao Meng,
Guanghong Zhang,
Donghui Bai,
Feng Gao,
Lei Xu,
Wending Zhang,
Ting Mei,
Jianlin Zhao
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.435046
Subject(s) - materials science , raman spectroscopy , finite difference time domain method , electric field , surface enhanced raman spectroscopy , plasmon , rhodamine 6g , optoelectronics , optics , inductively coupled plasma , nanopillar , plasma , nanotechnology , raman scattering , nanostructure , physics , quantum mechanics , fluorescence
A plasmonic double periodic arranged nanocone array (DPANA) integrated by nanotips and nanogaps exhibit strong capability of light compression, and thus lead to extremely enhanced electric near-field intensity. The DPANA is fabricated by the self-assembled mask integrated with the inductively couple plasma (ICP) etching technology. Finite-difference time-domain (FDTD) simulations suggest that the metallized DPANA can generate a strong hotspot at the sharp tip apex and the nanogap between adjacent sharp tips. The electric-field enhancement characteristic is firstly verified with the help of the second-order surface nonlinear optical response of the metallized DPANA. The surface-enhanced Raman spectroscopy (SERS) examination of the metallized DPANA exhibits high sensitivity due to clearly presenting the Raman spectra of Rhodamine-6G (R6G) with concentrations down to 10 pM and has excellent uniformity, time stability, and recyclability, simultaneously. Furthermore, the principle demonstration of SERS practical application is also performed for thiram. This as-prepared SERS substrate has great potential application for trace amount detection.