Photo of plasmonic device testing system

The plasmonic device (waveguide or grating) is mounted on a three-dimensional translation/rotation stage, allowing highly precise angular adjustment and spatial alignment regarding to the incident light. A laser or a broad band light source was coupled into a single mode polarization-maintaining (PM) fiber and coupled into the device. An objective lens with NA = 0.65 is used to image the near field into a FLIR IR camera.