Zhang Lu, Meng Chao, Zhang Guanghong, Bai Donghui, Gao Feng, Xu Lei, Zhang Wending, Mei Ting, Zhao Jianlin
Opt Express. 2021 Aug 30;29(18):28086-28095. doi: 10.1364/OE.435046.
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.
由纳米尖和纳米间隙集成的等离子体双周期排列纳米锥阵列（DPANA）具有很强的光压缩能力，从而导致近场电场强度极大增强。DPANA是通过与电感耦合等离子体（ICP）蚀刻技术集成的自组装掩膜制造的。时域有限差分（FDTD）模拟表明，金属化的DPANA可以在尖锐尖端顶点和相邻尖锐尖端之间的纳米间隙处产生强烈的热点。借助金属化DPANA的二阶表面非线性光学响应，首次验证了电场增强特性。金属化DPANA的表面增强拉曼光谱（SERS）检测具有高灵敏度，因为它能清晰呈现浓度低至10 pM的罗丹明6G（R6G）的拉曼光谱，同时具有出色的均匀性、时间稳定性和可重复性。此外，还对福美双进行了SERS实际应用的原理验证。这种制备的SERS基底在痕量检测方面具有巨大的潜在应用价值。
