Power-Dependent Coupling Characteristics of a Butt Joint between a Single-Mode Planar Waveguide and a Nonlinear Planar Waveguide with Different Film Thickness

Abstract

The interactions of V with Cr 2 O 3 (0001) films and Cr with V 2 O 3 (0001) films at room temperature are studied using x-ray photoelectron spectroscopy and low-energy-electron diffraction. The results show that the deposited V is oxidized and the Cr 2 O 3 (0001) surface is reduced at the initial coverage due to the interaction of V with the Cr 2 O 3 substrate; V becomes metallic at V coverage greater than 5 monolayer equivalent. Full oxidization of the deposited vanadium cannot be achieved by O 2 exposure at room temperature for 20 min. However, V 2 O 3 (0001) films have been observed after heating the sample to 600-700 K in oxygen ambient at 1 × 10 −7 mbar. Similar results have been obtained for the Cr/V 2 O 3 (0001)/Re(0001) system.