Emission from functional-polymer-injected point defects in two-dimensional photonic crystals

We consider the selective injection of active material into a 2-D photonic crystal. Using an alumina nanohole array as a base photonic crystal, we fabricated a positional-selective through-hole in the array with a focused ion beam. The active material, a polythiophen derivative, was then injected into the through-hole. As a result, a positional-selective polythiophen-injected alumina nanohole array was fabricated. The calculation predicts that a defect level is introduced into the photonic bandgap of the alumina nanohole array by selective injection of polythiophen. Optical measurement shows a sharp emission peak corresponding to the defect level. This demonstrates that a functional point in an alumina nanohole array can be successfully fabricated by selective polymer injection and proves that the defect level is introduced into the photonic bandgap by the selective polymer injection.