Fig. 1. Experimental setup for generation of Lieb lattice plasma photonic crystals by dielectric barrier discharge

Fig. 2. Lieb lattice plasma photonic crystals with different primitive structures. (a) Double-circle Lieb lattice at voltage of U=3.9kV and gas gap spacing of d=1.0mm; (b) double-diamond Lieb lattice at voltage of U=4.2kV and gas gap spacing of d=2.0mm; (c) diamond-circle Lieb lattice at voltage of U=4.5kV and gas gap spacing of d=2.5mm; (d) diamond-rectangle Lieb lattice at voltage of U=5.0kV and gas gap spacing of d=3.0mm

Fig. 3. Spatio-temporal measurement of diamond-rectangle Lieb lattice. (a) Correlation measurement of light signals between lattice position discharge filament S₁ and edge-center position discharge filament S₂ in diamond-rectangle Lieb lattice; (b) Laplacian field intensity distribution corresponding to square grid electrode

Fig. 4. Phase diagram of Lieb lattice plasma photonic crystal with different primitive structures

Fig. 5. Dispersion relations of Lieb lattice plasma photonic crystals with different primitive structures. (a1)-(a3) Double-circle Lieb lattice; (b1)-(b3) double-diamond Lieb lattice; (c1)-(c3) diamond-circle Lieb lattice; (d1)-(d3) diamond-rectangle Lieb lattice

Fig. 6. Dispersion relation of Lieb lattice plasma photonic crystal with diamond-circle primitive structure. (a) Schematic diagram of primitive cell; (b) band gap diagram