Theoretical Investigation On The Exotic Physical Properties Of Nano-optomechnical System

The light-matter interaction has recently attracted considerable at-tention. Those studies are of great importance from both theoretical studyand practical application point of view. Here we investigate three systemsof this feld, i.e. DNA-QD hybrid system, optically pumped spin wavelaser and metal nanoparticle-graphene system.In the study of DNA-QD hybrid system(Chapter2), we theoretical-ly explored the slow-fast light phenomena and optical nonlinearities. Byproperly adjusting pump-exciton detuning and signal-exciton detuning,great alterations of the velocity of signal light would come into being withlittle absorption. The DNA-QD coupling would lead to impressive nonlin-ear optical properties, such as the large enhancement of Kerr coefcientand high-order(third and ffth order) sideband nonlinear for signal beam.Of course, the pump beam and signal beam should be adjusted properly.We demonstrated obviously that none of those phenomena could occurwithout the DNA-QD coupling. One could detect DNA vibration modeby utilizing those phenomena. We think our research could provide peoplewith a deeper understanding of DNA-QD hybrid system.In the study of optically pumped spin wave laser(Chapter3), wetheoretically demonstrated the spin wave laser in a hybrid semiconduc- tor quantum dot-ferromagnetic waveguide system. This spin wave laserwould occur due to QD-spin waveguide coupling. The intensity of the spinwave laser could be drastically enhanced by increasing the intensity of thepump beam. The scheme will have its potential applications in spin-baseddevices and quantum information processing.In the study of metal nanoparticles(MNP)-graphene system(Chapter4), we depicted the giant Faraday efect theoretically. In high frequencyregion, MNP induced Faraday rotation efect(MIFRE) presents a giantFaraday rotation angle as well. Another advantage of MIFRE is the am-plifcation of the rotating light beam. Furthermore, the MIFRE couldbe tuned by changing the MNP-graphene distance. Those advantages ofMIFRE implies its great potential for applications.