Fig. 4: Measurements of polarization rotation.
a Microscope image of a 20 μm WG with an HPIC (SEM inset). Light is coupled to the waveguide using a TE grating at input. b Measured light from the output TE grating and the tip (dashed line in (a)). c Placing a polarizer between scattered light and camera confirms that light from the tip is TM polarized, while light from the grating is TE polarized. White arrows in (c) show polarizer orientation. d Measured light scattered by the output grating with and without the HPIC, resulting in 13% relative transmittance. Colorscale in (b), (c), and (d) represents the number of photon counts measured by the InGaAs camera, divided by the maximum number of counts measured in (b) and (d), respectively.
