激光与光电子学进展, 2012, 49 (9): 091601, 网络出版: 2012-06-27   

纳米天线增强光波透过金属薄膜上亚波长小孔的模拟研究

Simulation Investigation of Optical Wave Enhanced Transmission Through a Subwavelength Hole on Metal Film by Using Nano-Antenna
作者单位
贵州大学物理系, 贵州 贵阳 550025
摘要
亚波长金属结构的光学性质已成为光学研究的热点之一。应用三维时域有限差分(3D-FDTD)法模拟研究了利用三维金属纳米天线实现的金属薄膜上亚波长狭缝的光波强透射。分别在金属膜前后放置金属天线,计算光波透过金属薄膜上亚波长狭缝的透射率。通过改变小孔和天线的相对位置,发现当天线和小孔共振模的阶数同为二阶和三阶时,相位匹配,能相互耦合,形成两个强透射峰。当天线放置在狭缝前方和后方,天线共振可以将能量耦合进入和耦合出小孔,都能实现强透射。
Abstract
The optical properties of the subwavelength metal structure have become a hotspot of optical research. The influence of metal nano-antenna on optical wave transmission through the subwavelength hole on metal film is investigated by applying the three-dimensional finite-difference time-domain (3D FDTD) method. Nano-antenna is laid in front of and behind a metal film with a hole, respectively. The zeroth-order transmittances are obtained. It is found that the second-order and third-order enhanced transmission is realized under the phase matching condition when the orders of resonances mode of antenna and hole are the same. Energy can be coupled into the hole to enhance the near fields through antenna resonance when the antenna is laid in front of the hole, while coupled out of the hole through antenna resonance when the antenna is laid behind the hole.

陈跃刚, 刘广群. 纳米天线增强光波透过金属薄膜上亚波长小孔的模拟研究[J]. 激光与光电子学进展, 2012, 49(9): 091601. Chen Yuegang, Liu Guangqun. Simulation Investigation of Optical Wave Enhanced Transmission Through a Subwavelength Hole on Metal Film by Using Nano-Antenna[J]. Laser & Optoelectronics Progress, 2012, 49(9): 091601.

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