The area of multiphoton absorbing materials, two-photon photochemistry, in vivo and ex vivo two-photon fluorescence bioimaging, magnetic polymeric and sol-gel nanocomposites, site-specific fluorophore labeling, fluorescent-based sensors and bioimaging probes, photodynamic therapy agents, nanostructured functional organic and polymeric materials, and two-photon based 3D high density optical data storage.