Optical Studies of Cu-based Meta-materials

• Main Authors: Pei-Hsuan Han, 韓佩軒
• Other Authors: Wei-Xin Ni
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/26862254970950813629

碩士 === 國立交通大學 === 電子工程系所 === 96 === Meta-materials are a group of periodically patterned two-dimensional (or even three-dimensional) metal structures (lattices), which reveal some novel optical properties, such as plasmonic resonance, artificial magnetism, and/or left-handed behaviors, due to existing negative values of permittivity (ε), permeability (μ), and consequent refraction index (n), when electromagnetic (EM) waves (light) propagating along the surface of these pattern arrays at a certain range of wavelengths. By using copper (Cu) chemical replacement instead of electrochemical plating, a new fabrication technology has been developed through this thesis work, and been successfully used in producing Cu-based meta-materials with line-widths at the sub-micrometer-scale. Three types of pattern structures, namely, split ring resonator (SRR), discontinuous wires (WIRE) and composite meta-materials (CMM = SRR+WIRE) were designed and processed forming periodic arrays in the area of about 0.09 cm2. Fourier transfer infrared spectroscopy (FTIR) measurements were engaged for the study of optical properties of these meta-material structures. Over the range of 600-2000 cm-1, several resonance modes with different physics origins were observed from the spectra of three type patterns, when varying the polarization of incident light. EM simulations were also performed using a CST MWS solver for modeling the meta-material behavior at the corresponding wavelength range. Comparison with experiment results were made, in order to facilitate discussions of possible mechanism and physical insights of these Cu-based meta-materials.