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(Color online) (a) Schematic view of a plasma photonic crystal in our experimental setup. The periodical two-dimensional structure has an area of . The metal aperture prevents electromagnetic waves from entering the photonic crystal region along other paths. The distance between the plasma photonic crystal and the transmitter or the receiver is . Horn antennas are set to realize TE-mode propagation. (b) Visible emission of the plasma photonic crystal.
(Color online) Time evolutions of transmittance signals at different detection positions with discharge signals. Applied voltage and current signals of (a) with and (b) with . (c) Transmittance signals at on-axis detection position at two different frequencies. (d) Transmittance signals at off-axis detection position at two different frequencies.
Band diagrams of plasma photonic crystals of circular-shaped columns in a square lattice, calculated from plane-wave expansion method, where c is the speed of light. Dielectric coefficients of collisional plasmas are derived from (a) and (b) . The area enclosed by the inset dotted lines indicates the enlarged region in Fig. 4(b).
(Color online) (a) Transmittance signals as a function of frequency. Closed squares and circles show on-axis and off-axis measurements, respectively. (b) Band diagram enlarged from the marked area in Fig. 3(a).
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