Design of Filters Based on Photonic Crystal Slabs

To realize Photonic Crystal (PhC) slab based filters in integrated circuits, two methods using Perfect Electric Conductor (PEC) walls to replace periodic boundary conditions of the PhC slab and embedding a PhC filter in a conventional waveguide structure are presented. In the former case - as conductors at optical frequencies aren´t PECs at all - a real metal (silver) was partially coated near the PhC holes along the sides of the trench waveguide to realize a PhC slab based filter. Although the coatings completely spoil the filter properties and the loss in metal reduces the filter quality (transmission, bandwidth, etc.), it is possible to reestablish the desired filter characteristics by using an optimization procedure that also takes the coating into account.