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Schematic of the two cylinder patterns under investigation. Also depicted are the structures’ brillouin zones as well as the direction and polarization of the incident terahertz radiation. The structures’ unit cells are highlighted. Note that the unit cell of the hexagonal array contains two separate cavities.
Numerical calculations of the first TE and TM eigenmodes in the cavities of square and hexagonal cylinder arrays.
Transmission measurements and numerically calculated band structures of (a) the six-layer hexagonal array and (b) the five-layer square array of cylinders with . Transmission bands exist where there are eigenmodes with wave vectors parallel to that of the incident radiation (shaded areas). The bands relate to the field patterns of the TE modes shown in Fig. 2(a). Subscripts and mark symmetric and antisymmetric modes, respectively.
Numerical simulations of a plane wave hitting a photonic crystal from the left. The magnetic field component perpendicular to the plane of periodicity is shown. (a) Resonant transmission at . (b) Evanescent wave at (photonic band gap, cf. Fig. 3). (c) Nonresonant transmission through a thin sample at .
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