Optical antenna arrays on a fiber facet for in situ surface-enhanced Raman scattering detection.
Optical antenna arrays on a fiber facet for in situ surface-enhanced Raman scattering detection.
复制标题
DOI：
10.1021/nl803668u
复制
发表时间：
2009-03
期刊：
影响因子：
10.8
通讯作者：
Capasso F
中科院分区：
文献类型：
--
作者：
Smythe EJ;Dickey MD;Bao J;Whitesides GM;Capasso F
本文报道了一种用于表面增强拉曼散射（SERS）探测的双向光纤探头。探针的一面是一排金色光学天线，旨在增强拉曼信号，而光纤的另一面用于输入和收集光。同时检测苯硫醇和2-[(E)-2-吡啶-4-乙烯基]吡啶通过35厘米长的纤维。纳米级光学天线阵列最初是通过电子束光刻技术在硅片上定义的。阵列随后从晶圆上剥离，然后转移到光纤的表面。天线的光刻定义提供了一种产生具有明确几何形状的二维阵列的方法，该方法允许(i)调整探针的光学响应，（ii）控制产生增强拉曼信号的“热点”密度。大多数具有“热点”的光纤拉曼传感器的拉曼信号增强因子（EF）很难确定，因为拉曼增强纳米结构的几何形状定义不清。控制天线的大小和间距的能力使传输阵列的EF可以估计。将激光直接聚焦到传输阵列后，估计的EF值在2.6 × 105 ~ 5.1 × 105之间。
This paper reports a bidirectional fiber optic probe for the detection of surface enhanced Raman scattering (SERS). One facet of the probe features an array of gold optical antennas designed to enhance Raman signal, while the other facet of the fiber is used for the input and collection of light. Simultaneous detection of benzenethiol and 2-[(E)-2-pyridin-4-ylethenyl]pyridine is demonstrated through a 35 cm long fiber. The array of nanoscale optical antennas was first defined by electron-beam lithography on a silicon wafer. The array was subsequently stripped from the wafer and then transferred to the facet of a fiber. Lithographic definition of the antennas provides a method for producing two-dimensional arrays with well-defined geometry, which allows (i) the optical response of the probe to be tuned and (ii) the density of ‘hot spots’ generating the enhanced Raman signal to be controlled. It is difficult to determine the Raman signal enhancement factor (EF) of most fiber optic Raman sensors featuring ‘hot spots’ because the geometry of the Raman enhancing nanostructures is poorly defined. The ability to control the size and spacing of the antennas enables the EF of the transferred array to be estimated. EF values estimated after focusing a laser directly onto the transferred array ranged from 2.6 × 105 to 5.1 × 105.
登录
查看更多内容
DOI：
10.1016/0584-8539(82)80152-9
发表时间：
1982-01-01
影响因子：
4.4
作者：
MCMAHON, JJ;BABCOCK, GT
通讯作者：
BABCOCK, GT
影响因子：
2.1
作者：
Fu, YQ;Bryan, NKA
通讯作者：
Bryan, NKA
影响因子：
8.4
作者：
Stokes, DL;Vo-Dinh, T
通讯作者：
Vo-Dinh, T
影响因子：
4.2
作者：
Gessner, R;Rösch, P;Popp, J
通讯作者：
Popp, J
DOI：
10.1116/1.579726
发表时间：
1995-05-01
期刊：
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS
影响因子：
--
作者：
HULTEEN, JC;VANDUYNE, RP
通讯作者：
VANDUYNE, RP