![]() ![]() Third, by combining several structures in sequence - ordinary waveguide with no holes, periodic structure, defect, periodic structure, waveguide - we can make a filter. Second, by making a defect in the periodic sequence, in this case by separating one pair of holes by a greater amount, we can trap a resonant cavity mode : it is localized along the waveguide direction by the band gap, and partially in the transverse direction by index guiding. In particular, there are three basic ideas behind this structure, which we briefly summarize.įirst, by taking a dielectric wavgeuide and perforating it with a periodic sequence of holes, we form a kind of photonic crystal: there are still index-guided modes propagating losslessly down the periodic waveguide, but there is also a partial photonic band gap : a range of frequencies in which no guided modes exist. In this example, we will consider the two-dimensional structure shown below, which is based on a system considered in Chapter 7 of Photonic Crystals: Molding the Flow of Light second edition. ![]()
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