Ono Atsushi, Kato Jun-Ichi, Kawata Satoshi
Department of Applied Physics, Osaka University, Suita, Japan.
Phys Rev Lett. 2005 Dec 31;95(26):267407. doi: 10.1103/PhysRevLett.95.267407. Epub 2005 Dec 28.
We propose a subwavelength imaging system without a lens or a mirror but with an array of metallic nanorods. The near-field components of dipole sources were plasmonically transferred through the rod array to reproduce the source distribution in the other side. We calculated the field distribution at the different planes of imaging process using the finite-difference time-domain algorithm and found that the spatial resolution was 40 nm given by the rod size and spacing. A typical configuration is a hexagonal arrangement of silver rods of 50 nm height and 20 nm diameter. We also show that the image formation highly depends on the coherence and the polarization of the source distribution and the source-array distance.
我们提出了一种无需透镜或镜子、仅由金属纳米棒阵列构成的亚波长成像系统。偶极子源的近场分量通过该棒阵列以表面等离子体激元的方式进行传输，从而在另一侧再现源分布。我们使用时域有限差分算法计算了成像过程中不同平面的场分布，发现由棒的尺寸和间距决定的空间分辨率为40纳米。一种典型的结构是由高度为50纳米、直径为20纳米的银棒呈六边形排列组成。我们还表明，图像形成高度依赖于源分布的相干性和偏振以及源与阵列之间的距离。
