Photonic band gaps, defect characteristics, and waveguiding in two-dimensional disordered dielectric and metallic photonic crystals

Abstract

We experimentally investigated the influence of positional disorder on the photonic band gap, defect characteristics, and waveguiding in two-dimensional dielectric and metallic photonic crystals. Transmission measurements performed on the dielectric photonic crystals have shown a stop band even if a large amount of disorder was introduced to these structures. On the other hand, the photonic band gap of the metallic crystals was found to be very sensitive to disorder, while the metallicity gap was not affected significantly. We addressed how the transmission characteristics of a cavity were affected in the presence of weak disorder. Since the translational symmetry was broken by disorders, we measured different cavity frequencies when we generated defects at various locations. We also demonstrated the propagation of photons by hopping through coupled-cavity structures in both dielectric and metallic two-dimensional photonic crystals. Effects of weak disorder on guiding and bending of electromagnetic waves through the coupled-cavity waveguides were also investigated.

Disordered graphene and boron nitride in a microwave tight-binding analog

“…40) assuming infinitely long cylinders have been suggested for two-dimensional tightbinding realizations 41 . Effects of disorder have been investigated theoretically 42 and implemented successfully experimentally 43 . Transport of electrons in lattices is related to wave phenomena.…”

Improved Bend Waveguide Design for Terahertz Transmission

“…Nevertheless, metallic photonic crystals have demonstrated important advantages over the dielectric photonic crystals, such as wider band-gaps and smaller sizes [6][7][8]. Metallic photonic crystals have been studied mostly in microwave and millimetre frequency range due to their low propagation losses [9][10][11]. They have also been used in THz frequency range to study their filtering and wave guiding capability [12][13][14][15][16].…”

Electromagnetic Wave Propagation in Two-Dimensional Photonic Crystals

“…Simple realization of a two-dimensional structure comes in the microwave regime by arrang ing mm sized alumina rods in square [71] or triangular lattices. Structures with high dielectric rods in air background have also a limit in miniaturization due to fabrication constraints.…”