테라헤르츠 평면형 금속 광결정의 투과특성 연구
Transmission properties of planar metallic photonic
crystals in THz range
이성호1, 강 철2, 기철식1,2, 지상윤1,3,
1School of Photon Science and Technology, GIST 2
Nanophotonics Laboratory, Advanced Photonics Research Institute, GIST
3
Optical Communication Laboratory, Advanced Photonics Research Institute, GIST Email: [email protected], [email protected]
The artificial structures with periodic dielectric modulation, i.e., photonic crystals, can exhibit frequency ranges in which the propagation of photons is prohibited, i.e., photonic band gaps, and highly dispersive properties causing the anomalous refraction phenomena such as super-prism effects and negative refraction. It has been demonstrated that are useful in controlling the propagation and emission of photon [1,2]. Thus photonic crystals could offer unprecedented properties playing a crucial role in developing future photonics [3,4].
In recent, new artificial structures, metamaterials to exhibit unusual effective permittivity and permeability in a certain wavelength range [5-7] have attracted much attention because they can allow electromagnetic phenomena which are impossible in nature such as negative refraction,[8] perfect lens,[9] optical magnetic resonance [10], and invisible cloaking.[11, 12]
A perfect metal film with a periodic array of holes has been regarded as a plasmonic metamaterial because it has optical properties not to find in a perfect metal film. For example, a perfect metal film with a periodic array of holes can support a surface bound wave that is similar with a surface plasmon of a metal film, although a perfect metal film cannot support the bound wave,[13] and a perfect metal film with a periodic array of cut-through silts can behave as a dielectric layer with a high refractive index.[14]
A dielectric film with a periodic metallic array has been regarded as a metallic photonic crystal. One of interesting electromagnetic phenomena of the metallic photonic crystal film is narrow high reflection bands. The high reflection band depends on the structural parameters of the periodic metallic array. Also, a dielectric film with a wire grid array can act a polarizer in a low frequency range. The low-freqeuncy effective dielectric constant follows the Drude's model.[15]
In this presentation, we investigate transmission characteristics of various metallic photonic crystal films in a THz frequency range. The planar type metallic photonic crystals was fabricated on papers, transparency films, and semiconductor substrates. The fabrication processes and measured transmission will be presented in detail.
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