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Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1998),
  • paper QThG6

Fabry-Perot-type resonances in metallic photonic crystals

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Abstract

Metallic photonic crystals (MPCs) with face-centered tetragonal (FCT) lattice composed of rods1 and metallodielectric photonic crystals with face-centered cubic (FCC) lattice composed of spheres2 have already been investigated at microwave frequencies. In our experiments, we investigated an MFC in the microwave regime. The MFC has an FCC Bravais lattice composed of steel spheres, with diameter d = 0.635 cm. The lattice was formed along the (100) direction by stacking alternating layers of spheres. One layer consists of spheres packed as shown in Fig. 1, which depicts the (001) plane (top view) of the MFC. Our MFC consisted of 11 layers or five-unit cells. The lattice constant was a = 1.5 cm. The supporting dielectric material was air-doped polystyrene with a refractive index n = 1.16. Such a low refractive index for the supporting dielectric material allowed us to realize the first, to our knowledge, MFC with its spheres almost floating in the air. Figure 2 shows the transmission spectrum through the MFC along the (100) crystal direction. The lower edge of the stop band starts at 13.0 GHz. The center frequency for the stop band is at 17.25 GHz, which compares favorably with the normal (θ = 0°) incidence Bragg condition frequency. The upper edge of the stop band is at 21.5 GHz. Therefore, the width of the stopband is 50% of the center frequency, which makes our MFC suitable for microwave applications. Ignoring the oscillations, the maximum rejection at the band center is 35 dB, corresponding to a rejection of 7 dB per unit cell.

© 1998 Optical Society of America

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