Ultrasmooth metallic films with buried nanostructures for backside reflection-mode plasmonic biosensing.
Ultrasmooth metallic films with buried nanostructures for backside reflection-mode plasmonic biosensing.
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DOI：
10.1002/andp.201200144
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发表时间：
2012-11
影响因子：
2.4
通讯作者：
Oh, Sang-Hyun
中科院分区：
文献类型：
--
作者：
Lindquist, Nathan C.;Johnson, Timothy W.;Jose, Jincy;Otto, Lauren M.;Oh, Sang-Hyun
关键词：
我们提出了一种新的等离子体器件结构，该结构基于具有埋藏等离子体纳米结构的超光滑金属表面。利用模板剥离技术，表面粗糙度小于5？的超薄金膜被光学耦合到任意排列的掩埋的金属栅格、环和纳米点上。作为一个典型的例子，我们提出了埋藏在20 nm厚的超光滑金表面下的用于生物传感的线性等离子体光栅。由于背面的反射模式几何结构，光学照明和收集与液体样品的微流控输送完全分离。这允许使用不透明或高度分散的液体进行传感。与传统的基于棱镜的表面等离子体共振(SPR)传感器一样，采用埋入式纳米结构设计，我们保持了高灵敏度和分离的背面(反射)光学访问。此外，我们还获得了纳米等离子体传感器提供的好处，如光谱可调谐和易于构造和对准的具有垂直入射表观照明的高分辨率、广视场SPR成像。除了传感，我们的埋藏式等离子体纳米结构具有超光滑的金属表面，可以用于纳米光子波导、表面增强光谱、纳米光刻和光学陷阱。
We present a new plasmonic device architecture based on ultrasmooth metallic surfaces with buried plasmonic nanostructures. Using template-stripping techniques, ultrathin gold films with less than 5 Å surface roughness are optically coupled to an arbitrary arrangement of buried metallic gratings, rings, and nanodots. As a prototypical example, we present linear plasmonic gratings buried under an ultrasmooth 20 nm thick gold surface for biosensing. The optical illumination and collection are completely decoupled from the microfluidic delivery of liquid samples due to the backside, reflection-mode geometry. This allows for sensing with opaque or highly scattering liquids. With the buried nanostructure design, we maintain high sensitivity and decoupled backside (reflective) optical access as with traditional prism-based surface plasmon resonance (SPR) sensors. In addition, we also gain the benefits offered by nanoplasmonic sensors such as spectral tunability and high-resolution, wide-field SPR imaging with normal-incidence epi-illumination that is simple to construct and align. Beyond sensing, our buried plasmonic nanostructures with ultrasmooth metallic surfaces can benefit nanophotonic waveguides, surface-enhanced spectroscopy, nanolithography, and optical trapping.
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影响因子：
3.9
作者：
Brolo, AG;Gordon, R;Kavanagh, KL
通讯作者：
Kavanagh, KL
影响因子：
17.1
作者：
Gao, Yongkang;Gan, Qiaoqiang;Bartoli, Filbert J.
通讯作者：
Bartoli, Filbert J.
影响因子：
19
作者：
Lee, Si Hoon;Johnson, Timothy W.;Oh, Sang-Hyun
通讯作者：
Oh, Sang-Hyun
影响因子：
7.4
作者：
Haynes, CL;McFarland, AD;Van Duyne, RP
通讯作者：
Van Duyne, RP
影响因子：
8.6
作者：
Klar, T;Perner, M;Feldmann, J
通讯作者：
Feldmann, J