AbstractA novel design of optical filter based on photonic crystal structure is proposed in this paper. For designing the proposed filter we introduce an L3 resonant cavity between the input and output waveguides. We study the impact of different parameters on the filtering behavior of the structure using plane wave expansion and finite difference time domain methods. The initial form of this filter is capable of selecting the optical waves at λ = 1557.8 nm and the transmission efficiency of the filter is obtained about 84%. The total footprint of the filter is less than 205 μm
AbstractWe present a photonic crystal narrow pass-band optical filter, which is made of two pieces of photonic crystals with different photonic band gaps. Our numerical investigations show that this kind of structure is feasible for narrow pass-band optical filtering. The pass-band may be less than 0.1nm in the infrared communication frequency band. In ideal cases, the optical transmission in the pass band is very close to 1. This means a very low insert energy loss.
Very compact photonic crystal resonant cavity for all optical filtering
