Choi Soobong, Park Doojae, Lienau C, Jeong Mun Seok, Byeon Clare C, Ko Do-Kyeong, Kim D S
Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
Opt Express. 2008 Aug 4;16(16):12075-83. doi: 10.1364/oe.16.012075.
We demonstrate spatial control of optical near-fields by femtosecond phase shaping in one-dimensional plasmonic structures. The near-field images display striking temporal-phase dependence, switching between double- and single-peak images within one lattice constant. The change of the near-field distribution is studied in the time and spectral domain. The spectral composition change observed by varying the time delay between two phase-locked femtosecond pulses explains the spatial control of the near-field images. Modal expansion calculations of linear light transmission using the surface impedance boundary condition are in excellent agreement with experiments.
我们展示了通过飞秒相位整形在一维等离子体结构中对光学近场的空间控制。近场图像显示出显著的时间相位依赖性，在一个晶格常数内双峰图像和单峰图像之间切换。在时域和频域中研究了近场分布的变化。通过改变两个锁相飞秒脉冲之间的时间延迟观察到的光谱成分变化解释了近场图像的空间控制。使用表面阻抗边界条件对线性光传输进行的模态展开计算与实验结果非常吻合。
