The coupling interaction between an individual optical emitter and the propagating surface plasmon polaritons in a graphene microribbon(GMR) waveguide is investigated by numerical calculations, where the emitter is situated above the GMR or in the same plane of the GMR. The results reveal a multimode coupling mechanism for the strong interaction between the emitter and the propagating plasmonic waves in graphene. When the emitter is situated in the same plane of the GMR, the decay rate from the emitter to the surface plasmon polaritons increases more than 10 times compared with that in the case with the emitter above the GMR.
High quality epitaxial single phase(Ga_(0.96)Mn_(0.04))_2O_3 and Ga_2O_3 thin films have been prepared on sapphire substrates by using laser molecular b(eam)epitaxy(L-MBE). X-ray diffraction results indicate that the thin films have the monoclinic structure with a 201 preferable orientation. Room temperature(RT) ferromagnetism appears and the magnetic properties of β-(Ga_(0.96)Mn_(0.04))_2O_3 thin film are enhanced compared with our previous works. Experiments as well as the first principle method are used to explain the role of Mn dopant on the structure and magnetic properties of the thin films. The ferromagnetic properties are explained based on the concentration of transition element and the defects in the thin films.
