Date

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[P1-119]
14:00 ~ 15:30
Title:Optical Phase Modulation Characteristics of Subwavelength Tilted Nano-Slit Arrays
Yohan Lee, Jongwoo Hong (Seoul Nat'l Univ., Korea), Hwi Kim (Korea Univ., Korea), and Byoungho Lee (Seoul Nat'l Univ., Korea)
Abstract: Very recently, a considerable number of studies have been conducted on ultrathin plasmonic structures, so called metasurfaces. It is reported that metasurface can be used to control the phase of light and there are various examples using this characteristic such as directional couplers for surface plasmon polaritions?and ultrathin lenses. Among the different types of metasurfaces, computer-generated holograms (CGHs) have attracted a lot of interest. The reflection type metasurface using nanorod array is reported, which has even 80% efficiency. However, only few attempts have so far been made at researches on transmission type metasurface.In this paper, we analyze a transmission type metasurface which consists of tilted nanoslit array. Full phase modulation is possible by rotating the angle of slit. However, the amplitude of wave is not constant due to the interaction among adjacent slits. We modify each slit length and width along the slit angle to restrain the change of amplitude values. ?All the amplitude values are close to 0.3 by controlling the slit parameters. In this case, the range of phase modulation is almost 360 degrees.
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