Abstract
It is well known that the square lattice of isolated single-atom dielectric rods in air does notgive rise to complete bandgaps even when asymmetry is introduced to lift some degeneracy.However, in this paper, a new kind of two-dimensional square photonic crystal with isolatedsingle-atom dielectric rods in air formed by holographic lithography is proposed, and therelation between their photonic bandgap properties and their specific holographic designare systematically analyzed. In addition to the large complete relative bandgap,namely 9.68% gap/midgap ratio for the dielectric constant contrast of 13.6:1,this structure has very large tolerance on the system parameters and fabricationconditions. This fact can greatly relax the experimental requirements. This work maydemonstrate the unique feature and advantages of photonic crystals made by theholographic method and provide a guideline for their design and fabrication.
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