Mühlschlegel P, Eisler H-J, Martin O J F, Hecht B, Pohl D W
Nano-Optics group, National Center of Competence in Nanoscale Science, Institute of Physics, University Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Science. 2005 Jun 10;308(5728):1607-9. doi: 10.1126/science.1111886.
We have fabricated nanometer-scale gold dipole antennas designed to be resonant at optical frequencies. On resonance, strong field enhancement in the antenna feed gap leads to white-light supercontinuum generation. The antenna length at resonance is considerably shorter than one-half the wavelength of the incident light. This is in contradiction to classical antenna theory but in qualitative accordance with computer simulations that take into account the finite metallic conductivity at optical frequencies. Because optical antennas link propagating radiation and confined/enhanced optical fields, they should find applications in optical characterization, manipulation of nanostructures, and optical information processing.
我们制造了旨在在光频下共振的纳米级金偶极天线。在共振时，天线馈电间隙中的强场增强会导致白光超连续谱的产生。共振时的天线长度明显短于入射光波长的一半。这与经典天线理论相矛盾，但在定性上与考虑光频下有限金属电导率的计算机模拟结果相符。由于光学天线连接了传播的辐射和受限/增强的光场，它们应能在光学表征、纳米结构操纵和光学信息处理中找到应用。
