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- W2188815816 abstract "We investigate the initial buildup charac- teristics of the wave propagations in the wave guides made of sonic crystals or photonic crystals, whose rising time-constant is an important factor for high- speed signal processing and also for wave control by such functional wave guides. Sonic crystal made of air circular-cylinders in agar-gel host is shown to have novel and preferable properties for such wave-guides. We compare three typical artificial crystals for wave guides, namely sonic crystal A made of an array of acrylic-resin circular-cylinders in air, sonic crystal B of air circular-cylinders in agar-gel, and photonic crys- tal C of GaAs circular-cylinders in air. Longitudinal acoustic waves alone are assumed to contribute the guided waves in these sonic crystals. Using FDTD method for numerical simulations of the wave propagations in these artificial crystals, we have obtained different characteristic behaviors among these crystals. For buildup to a steady-state wave prop- agation in the straight waveguide, (1) sonic crystal A needs about 5 periods, (2) sonic crystal B needs less than a period, and (3) photonic crystal about 3 periods. Sonic crystal B is shown to have a novel prefer- able properties, namely not only quick establishment of the steady-state wave propagation, but also fine con- finement of the guided wave in the wave guide with a −133 dB leaky wave outside the crystal, highly decay- ing evanescent waves, weak Bragg-reflection and small dispersion in the wave guide." @default.
- W2188815816 created "2016-06-24" @default.
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- W2188815816 date "2002-01-01" @default.
- W2188815816 modified "2023-09-27" @default.
- W2188815816 title "NOVEL PROPERTIES OF WAVE PROPAGATIONS IN SONIC-CRYSTAL WAVE -GUIDES MADE OF AIR CYLINDERS IN AGAR-GEL" @default.
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