Spectral redistribution in spontaneous emission from quantum-dot- infiltrated 3D woodpile photonic crystals for telecommunications

The spectral redistribution in spontaneous emission from nanocrystalline PbSe quantum dots (QD) infiltrated in a 3D NIR woodpile PC fabricated by the two-photon polymerization (2PP) method has been reported. 2PP, direct laser writing method, has been used to produce 3D high quality PCs of woodpile and other structures. The 3D woodpile photonic crystals (PC) fabricated by using the 2PP method was formed layer-by-layer, directly on a cover glass. Lead chalcogenide nanocrystals have been identified to be useful for telecommunication photonic devices due to their tuneable NIR optical properties. Unlike incorporation techniques performed with composites, the 2PP method allows the infiltration and washing processes to be repeated many times for a given sample, giving a reliable comparison between different QD loading levels in the PC.