We report on the intensity dependent exciton dynamics in optically excited tris (8-hydroxyquinoline) aluminum (Alq3) films grown by organic molecular beam epitaxy that show a strong quenching of light emission at low temperature. We further report on the mode properties in plasmonic Alq3 waveguides and on the exciton emission in InP nanowires which are coated with a thin Alq3 films and Mg:Ag metal cluster layers.
Scratch holograms can be described as the limiting case of geometrical optics, where k→ ∞ , in which photons behave like grains of sand. We will show that scratch holograms can in principle be produced and read out by white light interference.
We produced high quality single crystalline ZnTe/ZnSe/GaAs (001) waveguides by atmospheric pressure metalorganic-vapor-phase epitaxy (MOVPE). Using end-fire coupling we observed a strong non-phase-matched second harmonic of the 1319 nm Nd:YAG fundamental (30 W peak power). In order to find out the best geometry for the second harmonic generation (SHG) in the ZnTe waveguide we measured the polarization dependence of this nonlinear process. Concepts of phase matched SHG in ZnTe waveguides are discussed.
One challenge to the electrical engineer consists in remodelling and
solving Maxwell's equations in the complicated boundary conditions of
a real optical waveguide. Much progress has been reported in this field
and was embodied in the design and manufacture of advanced optical fibers,
but the obscure process of obtaining these great results makes it desirable
to find more obvious and simpler ways of getting insight intO the behaviour
of light in the confined geometry of a fiber. In this paper we use the
concept of topological phases to estimate the phase shift of the light
wave due to winding of the optical fiber in a cable.
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