Huang Hsiang-Lin, Chou Chen Feng, Shiao Shi Hua, Liu Yi-Cheng, Huang Jian-Jang, Jen Shien Uang, Chiang Hai-Pang
Opt Express. 2013 Sep 9;21 Suppl 5:A901-8. doi: 10.1364/OE.21.00A901.
It is demonstrated that photoluminescence of DCJTB can be enhanced by surface plasmons occurred in silver nanoparticle arrays on glass substrates fabricated by using nanosphere lithography (NSL) combined with reactive ion etching (RIE). By changing the size of the seed polystyrene nanosphere with fixed thickness of SiO(2) film as a buffer layer between silver nanoparticles and fluorescent dye, we systematically studied the interaction between surface plasmons in Ag nanostructures and fluorescent dye by measuring the photoluminescence and time-resolved photoluminescence (TRPL) of the samples. As compared with pure DCJTB, it is observed that PL enhancement as high as 9.4 times and life time shortening from 0.966 ns shortened to 0.63 ns can be achieved with polystyrene nanosphere 430 nm in diameter. The physical origin due to plasmonic excitation has been clarified from 3D finite element simulations, as well as the assistance of UV-visible reflectance spectrum.
结果表明，通过使用纳米球光刻（NSL）结合反应离子刻蚀（RIE）在玻璃基板上制备的银纳米颗粒阵列中产生的表面等离子体激元，可以增强DCJTB的光致发光。通过在作为银纳米颗粒和荧光染料之间缓冲层的SiO₂薄膜厚度固定的情况下改变种子聚苯乙烯纳米球的尺寸，我们通过测量样品的光致发光和时间分辨光致发光（TRPL），系统地研究了Ag纳米结构中的表面等离子体激元与荧光染料之间的相互作用。与纯DCJTB相比，观察到直径为430 nm的聚苯乙烯纳米球可实现高达9.4倍的PL增强，并且寿命从0.966 ns缩短至0.63 ns。通过三维有限元模拟以及紫外可见反射光谱的辅助，阐明了等离子体激元激发的物理起源。
