Linewidth-Optimized Extraordinary Optical Transmission in Water with Template-Stripped Metallic Nanohole Arrays
Linewidth-Optimized Extraordinary Optical Transmission in Water with Template-Stripped Metallic Nanohole Arrays
复制标题
DOI：
10.1002/adfm.201200955
复制
发表时间：
2012-11-07
影响因子：
19
通讯作者：
Oh, Sang-Hyun
中科院分区：
文献类型：
--
作者：
Lee, Si Hoon;Johnson, Timothy W.;Oh, Sang-Hyun
报道了用模板剥离法在周期性银纳米孔阵列中观察到异常尖锐的等离子体共振峰的实验结果。在光滑的银-水界面处与表面等离子体激元相关的异常光透射（EOT）峰显示出在700 nm左右的波长处线宽低于10 nm的良好限定的Fano型轮廓。值得注意的是，这种尖锐而强烈的辐射峰（Q因子为71）是在水中的可见光频率和垂直入射照明下获得的。这是通过获得粗糙度低于1 nm的高质量Ag表面来实现的，这降低了与材料阻尼相关的Ag介电函数的虚部，以及缩小纳米孔半径以降低等离子体的辐射阻尼。辐射等离子体激元峰的局部光谱响应的特征在于使用纳米孔阵列在水中通过顺序原子层沉积的Al 2 O 3在逐层的方式。由于超尖锐的EOT峰是从水中的金属纳米孔阵列在厘米大小的区域上以优异的均匀性获得的，这些模板剥离的纳米孔阵列将有益于许多基于EOT的实际应用。
The experimental observation of unusually sharp plasmon resonance peaks in periodic Ag nanohole arrays made using template stripping is reported. The extraordinary optical transmission (EOT) peak associated with the surface plasmon polaritons at the smooth Ag-water interface shows a well-defined Fano-type profile with a linewidth below 10 nm at a wavelength of around 700 nm. Notably, this sharp and intense radiant peak (Q factor of 71) is obtained at visible frequencies in water and at normally incident illumination. This is accomplished by obtaining high-quality Ag surfaces with a roughness below 1 nm, which reduces the imaginary component of the Ag dielectric function that is associated with material damping, as well as shrinking the nanohole radius to decrease radiative damping of plasmons. The localized spectral response of the radiant plasmon peak is characterized using the nanohole array in water in a layer-by-layer fashion via sequential atomic layer deposition of Al2O3. Because the ultrasharp EOT peak is obtained with excellent uniformity over a centimeter-sized area from the metallic nanohole array in water, these template-stripped nanohole arrays will benefit many practical applications based on EOT.