Electromagnetic energy vortex associated with sub-wavelength plasmonic Taiji marks

• Main Authors: Wei Ting Chen, 陳威廷
• Other Authors: 蔡定平
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/10085031447710344311

碩士 === 國立臺灣大學 === 物理研究所 === 99 === The Taiji symbol is a very old schematic representation of two opposing but complementary patterns in oriental civilization. Using electron beam lithography, we fabricated an array of 70x70 gold Taiji marks with 30 nm thickness and a total area of 50x50 µm2 on a fused silica substrate. The diameter of each Taiji mark is 500 nm, while the period of the array is 700 nm. Here we present experimental as well as numerical simulation results pertaining to plasmonic resonances of several Taiji nano-structures under normal illumination. We have identified a Taiji structure with a particularly interesting vortex-like Poynting vector profile, which could be attributed to the special shape and dimensions of the Taiji symbol.