SEM Image (IMAGE) American Institute of Physics Caption This is a false-color, plan-view SEM image of a lateral gallium oxide field effect transistor with an optically defined gate. From near (bottom) to far (top): the source, gate, and drain electrodes. Metal is shown in yellow and orange, dark blue represents dielectric material, and lighter blue denotes the gallium oxide substrate. Credit AFRL Sensors Directorate at WPAFB, Ohio, US Usage Restrictions This image may be used only with appropriate credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.