Imbert-Fedorov Effect in Kretschmann Configuration with Anisotropic Metamaterial
We study the Imbert-Fedorov (IF) effect in Kretschmann configuration with anisotropic metamaterial to explore a flexible method to enhance and modulate IF shift. The physical mechanism for large IF shifts in an anisotropic waveguide based on spin-orbit angular momentum coupling is explained. The influences of metamaterial thickness, anisotropy, and loss on IF shift are systematically discussed. This provides a theoretical prediction of IF shift in a Kretschmann configuration which is verified by simulation results in semiconductor metamaterial waveguide. The simulation results show that both metamaterial anisotropy and loss contributes significantly to the IF shift. Thus, reducing the loss and enhancing the metamaterial anisotropy are necessary and important measures to realize enhanced IF effect in the proposed Kretschmann configuration.
Recently Geis fabricated a composite cold cathode emitter made of diamond doped by substitutional nitrogen on a roughened metallic substrate, which is characterized by high field emission currents at very low power. Using an internal field emission mechanism through the Schottky barrier at the metal diamond interfaces to populate the conduction band of diamond, we have developed a quantitative theory to describe the operation of such a device. The calculated I-V characteristics are in good agreement with the experimental results of Geis, et al.