X-bant aralığında çalışan 2 boyutlu altıgen fotonik kristaller

Photonic crystals have been a hot area of scientific and technological research, since their proposal in 1987. Photonic crystals are generally known as the "semiconductors" of photonics, and found applications in photonic circuits, optical imaging, and telecommunications. The scope of this research is to study microwave transmission response of 2D hexagonal photonic crystals of graphite rods. We used graphite rods to fabricate a photonic crystal structure and stacked the rods together to form a hexagonal lattice. In order to characterize the structure, we measured the transmission of the photonic crystal in the microwave X-band. No structure is observed in the transverse electric (TE) polarization transmission spectrum, as the graphite rods absorb more efficiently for that geometry. A photonic band gap with a width of 0.5 GHz is observed for transverse magnetic (TM) polarization at 10.8 GHz. As the angle of incidence is scanned, we observed the shifting of the bandgap frequency. A similar bandgap frequency was observed at 00 and 600 coinciding with the symmetry of the photonic crystal. We induced defect states in the photonic crystal, and observed a mode in the band gap, for a point defect. As Maxwell's equations are scalable, we can scale down our hexagonal photonic crystal to operate in micro to nano length scales. Our results show that, 2D graphite photonic crystals can be useful in microwave engineering.