Golubewa Lena, Rehman Hamza, Padrez Yaraslau, Basharin Alexey, Sumit Sumit, Timoshchenko Igor, Karpicz Renata, Svirko Yuri, Kuzhir Polina
Department of Molecular Compound Physics, State Research Institute Center for Physical Sciences and Technology, Sauletekio Av. 3, 10257 Vilnius, Lithuania.
Department of Physics and Mathematics, Center for Photonics Sciences, University of Eastern Finland, Yliopistokatu 7, 80101 Joensuu, Finland.
Materials (Basel). 2023 Feb 27;16(5):1948. doi: 10.3390/ma16051948.
Black silicon (bSi) is a highly absorptive material in the UV-vis and NIR spectral range. Photon trapping ability makes noble metal plated bSi attractive for fabrication of surface enhanced Raman spectroscopy (SERS) substrates. By using a cost-effective room temperature reactive ion etching method, we designed and fabricated the bSi surface profile, which provides the maximum Raman signal enhancement under NIR excitation when a nanometrically-thin gold layer is deposited. The proposed bSi substrates are reliable, uniform, low cost and effective for SERS-based detection of analytes, making these materials essential for medicine, forensics and environmental monitoring. Numerical simulation revealed that painting bSi with a defected gold layer resulted in an increase in the plasmonic hot spots, and a substantial increase in the absorption cross-section in the NIR range.
黑硅（bSi）是一种在紫外-可见和近红外光谱范围内具有高吸收性的材料。光子捕获能力使得镀有贵金属的黑硅对于表面增强拉曼光谱（SERS）基底的制造具有吸引力。通过使用一种经济高效的室温反应离子蚀刻方法，我们设计并制造了bSi表面轮廓，当沉积纳米级薄的金层时，该轮廓在近红外激发下可提供最大的拉曼信号增强。所提出的bSi基底对于基于SERS的分析物检测是可靠、均匀、低成本且有效的，使得这些材料对于医学、法医学和环境监测至关重要。数值模拟表明，用有缺陷的金层涂覆bSi会导致等离子体热点增加，并且在近红外范围内吸收截面大幅增加。
