Self-assembly of nanoparticles in photonic crystal cavities for optoelectronic devices.

摘要

Photonic crystals (PhC) offer many advantages in optoelectronics field. The focus of this thesis is to investigate a self assembly process for the formation of thin film based one-dimensional PhC and the integration of nanoparticles with two-dimensional PhC. Nanoparticles like SiO2, TiO2, PolyStyrene, and PbSe (with different surface properties) were subjected to different experiments.; Various techniques, such as spin coating, immersion technique, evaporation induced assembly technique, have been carried out by varying parameters like time, temperature, position of the substrate, etc.; An optimized method for the fabrication of 1D PhC was found to be evaporation induced Self-Assembly method by varying temperature. For 2D PhC, a process was developed based on immersion technique and subsequent surface cleaning, where SiO2 and PbSe nanoparticles are back filled into the air holes of 2D PhC. A theoretical study of radius of nanoparticles in 1D and forces acting on nanoparticles in 2D has been discussed.