Extraordinary optical transmission of plasmonic photonic crystal

• Main Authors: Yu-Cheng Su, 蘇郁誠
• Other Authors: Yang-Fang Chen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/59183795831600959353

碩士 === 國立臺灣大學 === 物理研究所 === 100 === In this thesis, the optical properties of plasmonic periodical structure which composes of Au coated on two-dimension (2D) photonic crystal have been studied. 2D photonic crystals were made simply from polystyrene (PS) spheres with different diameters by self-organization method, and then Au film was deposited on 2D PS spheres array. This structure is called as plasmonic photonic crystal with peculiar plasmonic characteristics. With the properties of plasmonic periodical structure, there exist extraordinary peaks in the transmission spectrum. The phenomenon of extraordinary peaks in transmission spectrum is due to the diffraction of plasmonic periodical structure called Bragg plasmon. In this study, multiple factors of the extraordinary transmission peak position, such as the diameter of PS spheres, various incident angles and polarization of excitation, and sensitivity of environmental refractive index, have been investigated to understand the origin and behavior of plasmonic periodical structure. Moreover, liquid crystal and plasmonic photonic crystal have been combined to form a new cell successfully. Using the sensitivity to environmental refractive index of the plasmonic photonic crystal and the anisotropy of refractive index of liquid crystal molecules, the wavelength of surface plasmon polaritons, can be modulated successfully by an applied voltage. We expect that the novel properties of plasmonic photonic crystal shown here, could promote present optoelectronic devices, for a wide range of applications.