基于中红外波段的等离子体金属孔天线(英文)

Plasmon antenna at mid-infrared made by metallic apertures

研究了周期性金属孔阵列的光学和远场辐射特性,实验发现所有样品在中红外波段都有两个透射峰,当金属孔径或者孔阵的晶格常数变大时,透过峰的中心频率发生红移.在透过率的中心频率附近,周期性的金属孔阵列表现出偶极子阵列的特性,其远场辐射特性随着孔径的减小或者孔阵列晶格常数的增大而增强.

The transmission spectra and far-field radiation patterns of periodic metallic aperture arrays are studied in mid-infrared region, We find that the samples have two transmission bands in mid-infrared region. The central po- sitions of transmission bands red-shifts with the increase of the hole-diameter or the lattice constant. The periodic metallic aperture arrays can behave as electrical dipole arrays at the central positions of the transmission bands. The radiation intensity in far-field is strong at the two frequencies. The intensity increase with the decrease of the hole diameter or the increase of the lattice constant,