Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.
Nanoscale. 2011 Sep 1;3(9):3627-30. doi: 10.1039/c1nr10595g. Epub 2011 Aug 15.
When two metallic surfaces supporting plasmonic excitation are brought into close proximity of each other, a nanogap (of width on the subwavelength scale) will form, which boosts greatly the local optical field. Based on this idea, we fabricated two types of three-dimensional plasmonic substrates with such nanogaps, taking advantage of both atomic layer deposition (ALD) and the capillary effect. Owing to the counteraction of the gap-reducing and capillary, nanogaps with different widths and profiles have been formed on the scaffold of aligned ZnO nanorods and shown to induce large field enhancement with enhancement factor up to 2.64 × 10(6) for surface-enhanced Raman scattering (SERS).
当两个支持等离子体激元激发的金属表面彼此靠近时，会形成一个纳米间隙（亚波长尺度的宽度），这将极大地增强局部光场。基于这个想法，我们利用原子层沉积（ALD）和毛细作用制造了两种具有这种纳米间隙的三维等离子体基片。由于间隙减小和毛细作用的相互作用，在排列整齐的 ZnO 纳米棒的支架上形成了具有不同宽度和轮廓的纳米间隙，并显示出具有高达 2.64×10(6)的表面增强拉曼散射（SERS）增强因子的大场增强。
