Surface plasmon microcavity for resonant transmission through a slit in a gold film
Surface plasmon microcavity for resonant transmission through a slit in a gold film
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DOI：
10.1364/oe.16.009708
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发表时间：
2008-06-23
期刊：
影响因子：
3.8
通讯作者：
Gordon, Reuven
中科院分区：
文献类型：
--
作者：
Min, Qiao;Gordon, Reuven
我们演示了使用一个紧凑的表面等离子体（SP）微腔形成在300 nm厚的金膜谐振增强通过亚波长狭缝的光传输。聚焦离子束研磨用于产生200 nm深的SP微腔，其宽度在800 nm至1300 nm之间，每个微腔在其中心具有180 nm的狭缝。实验测得的TM偏振光传输具有波长依赖性峰值，其在峰值位置和峰值传输的增强因子方面与时域有限差分计算具有相似性。计算结果表明，通过观察近场分布，SP微腔驻波和狭缝之间的相互作用，以创建增强传输。SP微腔在这里演示的是容易制造，并可能是未来的应用在表面增强拉曼散射，非线性光学和表面等离子体共振传感器的优化。(c)2008年美国光学学会。
We demonstrate the use of a compact surface plasmon (SP) microcavity formed in a 300 nm thick gold film to resonantly enhance the optical transmission through a subwavelength slit. Focussed ion beam milling is used to create 200 nm deep SP microcavities, with widths between 800 nm to 1300 nm, each with a 180 nm slit in its center. The experimentally-measured TM polarized optical transmission has a wavelength-dependent peak that has similarities with finite-difference time-domain calculations in terms of peak-position and enhancement factors of peak transmission. The calculations show, by observing the near-field distributions, the interaction between the SP microcavity standing waves and the slit to create enhanced transmission. The SP microcavity demonstrated here is easily fabricated and may be optimized for future applications in surface-enhanced Raman scattering, nonlinear optics and surface plasmon resonance sensors. (c) 2008 Optical Society of America.